id string | game_id string | source_set string | fen string | start_fen string | history_uci list | chess960 bool | side_to_move string | phase string | candidates list | chosen_move string | chosen_move_uci string | engine_best_uci string | engine_best_san string | robust_label bool | teacher_input string | teacher_output string | trace string | prompt string | reasoning string | answer string | accepted bool | revisions int64 | review string | teacher_model string | teacher_effort string | voice string | critic_model string | critic_effort string | critic_mode string | engine string | cost_usd float64 | referee_checked bool | referee_model string | referee_clean bool | referee_claims string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
lichess:pVgUY7dv#ply50 | lichess:pVgUY7dv | games | 2r3k1/1brnbppp/p3p3/3pP3/3B1P2/1PPN3P/1N4P1/R2R2K1 w - - 5 26 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"b1c3",
"b8c6",
"f2f4",
"e7e6",
"d2d3",
"d7d5",
"g1f3",
"g8f6",
"e4e5",
"f6d7",
"h2h3",
"f8e7",
"d3d4",
"d8b6",
"f1b5",
"a7a6",
"b5c6",
"b7c6",
"c3a4",
"b6b5",
"c2c3",
"c5d4",
"f3d4",
"b5b7",
"d1b3",
"e8g8",
"e1g1",
"b7b3",
"a2b3",
"c6c5"... | false | white | middlegame | [
{
"move": "Rxa6",
"line": "Rxa6 Bxa6 Ra1 Bxd3",
"score": "-7.03"
},
{
"move": "Kf2",
"line": "Kf2 Nc5 Nxc5 Bxc5",
"score": "+0.16"
},
{
"move": "b4",
"line": "b4 h5 g3 Nb8",
"score": "+0.29"
},
{
"move": "g3",
"line": "g3 Bc5 Na4 Bxd4+",
"score": "+0.14"
... | b4 | b3b4 | b3b4 | b4 | false | {"position":{"side_to_move":"white","move_number":26,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Nd3 Rc4 b3 Rcc8 Bd4 Rc7 Nab2 Rfc8","opening":"B23 Sicilian Defense: Grand Prix Attack","material":{"white":{"rook":2,"bishop":1,"knight":2,"pawn":... | {"position": "Material is level: White has two knights and a bishop against Black's knight and bishop pair, with six pawns each. White's e5-pawn gives space, but Black's rook on c7 presses c3 and ...Nc5 can hit b3 and d3; both kings have shelter.", "notes": {"Rxa6": "Rxa6 takes the a6-pawn and attacks e6, but ...Bxa6 t... | Position: Material is level: White has two knights and a bishop against Black's knight and bishop pair, with six pawns each. White's e5-pawn gives space, but Black's rook on c7 presses c3 and ...Nc5 can hit b3 and d3; both kings have shelter.
Candidates: Rxa6, Kf2, b4, g3
- Rxa6 Bxa6 Ra1 Bxd3: -7.03
Rxa6 takes the a6... | FEN: 2r3k1/1brnbppp/p3p3/3pP3/3B1P2/1PPN3P/1N4P1/R2R2K1 w - - 5 26
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level: White has two knights and a bishop against Black's knight and bishop pair, with six pawns each. White's e5-pawn gives space, but Black's rook on c7 presses c3 and ...Nc5 can hit b3 and d3; both kings have shelter.
Candidates: Rxa6, Kf2, b4, g3
- Rxa6 Bxa6 Ra1 Bxd3: -7.03
Rxa6 takes the a6... | b4 | true | 0 | [{"cost": 0.00257455, "seconds": 43.02, "reasoning_tokens": 4142, "flags": [], "critic_cost": 0.002141975, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004717 | false | null | null | null |
lichess:ysXJq5Oo#ply45 | lichess:ysXJq5Oo | games | r4rk1/1p6/3pb1nR/p2p1p2/3P1P2/P3P1P1/1P2BKP1/R7 b - - 1 23 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c2c4",
"e7e6",
"b1c3",
"d7d5",
"c4d5",
"e6d5",
"c1g5",
"f8b4",
"g1f3",
"h7h6",
"g5h4",
"e8g8",
"d1b3",
"a7a5",
"a2a3",
"b4c3",
"b3c3",
"g7g5",
"f3g5",
"h6g5",
"h4g5",
"d8d6",
"c3g3",
"d6g3",
"h2g3",
"f6e4",
"g5f4",
"c8f5",
"f2f3",
"e4d6"... | false | black | middlegame | [
{
"move": "Rf6",
"line": "Rf6 Rah1 Kg7 Rh7+",
"score": "-0.11"
},
{
"move": "Kg7",
"line": "Kg7 Rah1 Rh8 Rxh8",
"score": "+1.65"
},
{
"move": "Kf7",
"line": "Kf7 Rh7+ Kf6 Rxb7",
"score": "+1.14"
},
{
"move": "Nxf4",
"line": "Nxf4 gxf4 Kf7 Rh7+",
"score": "... | Kg7 | g8g7 | g8g7 | Kg7 | false | {"position":{"side_to_move":"black","move_number":23,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Ng6 Bxd6 cxd6 Rh5 Be6 f4 f5 Rh6","opening":"D35 Queen's Gambit Declined: Exchange Variation, Positional Variation","material":{"white":{"rook":2,"... | {"position": "Black has an extra knight but two fewer pawns, and White's rook on h6 attacks Black's knight on g6 with Rxg6+ threatened. Black's king on g8 has no g- or h-pawn cover, while Black's doubled d-pawns and isolated f5-pawn may become targets.", "notes": {"Rf6": "...Rf6 shifts Black's rook from f8 to f6, but W... | Position: Black has an extra knight but two fewer pawns, and White's rook on h6 attacks Black's knight on g6 with Rxg6+ threatened. Black's king on g8 has no g- or h-pawn cover, while Black's doubled d-pawns and isolated f5-pawn may become targets.
Candidates: Rf6, Kg7, Kf7, Nxf4
- Rf6 Rah1 Kg7 Rh7+: -0.11
...Rf6 shi... | FEN: r4rk1/1p6/3pb1nR/p2p1p2/3P1P2/P3P1P1/1P2BKP1/R7 b - - 1 23
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Black has an extra knight but two fewer pawns, and White's rook on h6 attacks Black's knight on g6 with Rxg6+ threatened. Black's king on g8 has no g- or h-pawn cover, while Black's doubled d-pawns and isolated f5-pawn may become targets.
Candidates: Rf6, Kg7, Kf7, Nxf4
- Rf6 Rah1 Kg7 Rh7+: -0.11
...Rf6 shi... | Kg7 | true | 1 | [{"cost": 0.0034038, "seconds": 53.94, "reasoning_tokens": 5796, "flags": [], "critic_cost": 0.0036617100000000003, "critic_tool_calls": 5, "false_claims": [{"quote": "Black's king remains in check.", "why": "After ...Kg7, Black is not in check; Rh7+ gives check for the first time in this line."}, {"quote": "Black's ki... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010254 | false | null | null | null |
lichess:VOrt0sAm#ply15 | lichess:VOrt0sAm | games | r1b1k2r/pp3ppp/1qn1pn2/2bP4/5P2/2N1PN2/PP4PP/R1BQKB1R b KQkq - 0 8 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"f2f4",
"e7e6",
"g1f3",
"d7d5",
"d2d4",
"c7c5",
"c2c4",
"g8f6",
"b1c3",
"b8c6",
"e2e3",
"d8b6",
"d4c5",
"f8c5",
"c4d5"
] | false | black | opening | [
{
"move": "exd5",
"line": "exd5 a3 Qd8 Na4",
"score": "+0.45"
},
{
"move": "Bxe3",
"line": "Bxe3 dxc6 Bf2+ Ke2",
"score": "-4.23"
},
{
"move": "Nxd5",
"line": "Nxd5 Na4 Bb4+ Kf2",
"score": "+0.43"
}
] | exd5 | e6d5 | e6d5 | exd5 | false | {"position":{"side_to_move":"black","move_number":8,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nf6 Nc3 Nc6 e3 Qb6 dxc5 Bxc5 cxd5","opening":"A02 Bird Opening","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":... | {"position": "White is a pawn up, and both kings remain on their starting squares. White's d5-pawn attacks Black's knight on c6, while Black's bishop on c5 attacks White's e3-pawn and Black's queen on b6 targets b2.", "notes": {"exd5": "exd5 takes White's d5-pawn; after a3, ...Qd8 avoids the fork, but Na4 attacks Black... | Position: White is a pawn up, and both kings remain on their starting squares. White's d5-pawn attacks Black's knight on c6, while Black's bishop on c5 attacks White's e3-pawn and Black's queen on b6 targets b2.
Candidates: exd5, Bxe3, Nxd5
- exd5 a3 Qd8 Na4: +0.45
exd5 takes White's d5-pawn; after a3, ...Qd8 avoids ... | FEN: r1b1k2r/pp3ppp/1qn1pn2/2bP4/5P2/2N1PN2/PP4PP/R1BQKB1R b KQkq - 0 8
Side to move: black
Recent moves: 6... Qb6 7. dxc5 Bxc5 8. cxd5
Board:
8 r . b . k . . r
7 p p . . . p p p
6 . q n . p n . .
5 . . b P . . . .
4 . . . . . P . .
3 . . N . P N . .
2 P P . . . . P P
1 R . B Q K B . R
a b c d e f g h
Find the best m... | Position: White is a pawn up, and both kings remain on their starting squares. White's d5-pawn attacks Black's knight on c6, while Black's bishop on c5 attacks White's e3-pawn and Black's queen on b6 targets b2.
Candidates: exd5, Bxe3, Nxd5
- exd5 a3 Qd8 Na4: +0.45
exd5 takes White's d5-pawn; after a3, ...Qd8 avoids ... | exd5 | true | 1 | [{"cost": 0.0029253, "seconds": 47.03, "reasoning_tokens": 4786, "flags": [], "critic_cost": 0.0046336450000000005, "critic_tool_calls": 4, "false_claims": [{"quote": "...Bf2+ forces Ke2", "why": "Ke2 is not forced; after ...Bf2+, White can also legally play Kd2."}, {"quote": "...Bb4+ forces Kf2", "why": "Kf2 is not fo... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010525 | false | null | null | null |
lichess:CBx3gC7o#ply17 | lichess:CBx3gC7o | games | r2qk2r/ppp2ppp/3pbn2/2b1p3/4P3/1PNP2N1/1PP2PPP/R1BQ1RK1 b kq - 0 9 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"b1c3",
"b8c6",
"f1c4",
"f8c5",
"d2d3",
"d7d6",
"g1e2",
"g8f6",
"e1g1",
"c8e6",
"c4b3",
"c6d4",
"e2g3",
"d4b3",
"a2b3"
] | false | black | opening | [
{
"move": "Bd4",
"line": "Bd4 Nge2 Bb6 Na4",
"score": "-0.49"
},
{
"move": "a6",
"line": "a6 h3 h6 Qe1",
"score": "-0.21"
},
{
"move": "Bxf2+",
"line": "Bxf2+ Rxf2 Ng4 Rf5",
"score": "-5.33"
},
{
"move": "a5",
"line": "a5 h3 O-O Qe1",
"score": "-0.18"
}
... | a5 | a7a5 | a7a5 | a5 | false | {"position":{"side_to_move":"black","move_number":9,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nf6 O-O Be6 Bb3 Nd4 Ng3 Nxb3 axb3","opening":"C25 Vienna Game: Max Lange Defense","material":{"white":{"queen":1,"rook":2,"bishop":1,"kni... | {"position": "Material is level, but Black has the bishop pair against White's bishop and two knights; White's b-pawns are doubled and White's bishop on c1 is undeveloped. White's king is safe on g1, while Black's king remains on e8 with castling available; Black's bishop on c5 pins f2 and the knight on f6 attacks e4."... | Position: Material is level, but Black has the bishop pair against White's bishop and two knights; White's b-pawns are doubled and White's bishop on c1 is undeveloped. White's king is safe on g1, while Black's king remains on e8 with castling available; Black's bishop on c5 pins f2 and the knight on f6 attacks e4.
Cand... | FEN: r2qk2r/ppp2ppp/3pbn2/2b1p3/4P3/1PNP2N1/1PP2PPP/R1BQ1RK1 b kq - 0 9
Side to move: black
Recent moves: 5... Nf6 6. O-O Be6 7. Bb3 Nd4 8. Ng3 Nxb3 9. axb3
Board:
8 r . . q k . . r
7 p p p . . p p p
6 . . . p b n . .
5 . . b . p . . .
4 . . . . P . . .
3 . P N P . . N .
2 . P P . . P P P
1 R . B Q . R K .
a b c d e ... | Position: Material is level, but Black has the bishop pair against White's bishop and two knights; White's b-pawns are doubled and White's bishop on c1 is undeveloped. White's king is safe on g1, while Black's king remains on e8 with castling available; Black's bishop on c5 pins f2 and the knight on f6 attacks e4.
Cand... | a5 | true | 1 | [{"cost": 0.0038658, "seconds": 62.6, "reasoning_tokens": 6621, "flags": ["move not on the shown lines: Nc3"]}, {"cost": 0.000288475, "seconds": 4.28, "reasoning_tokens": 95, "flags": [], "critic_cost": 0.002273725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006428 | false | null | null | null |
lichess:WRljqTGS#ply30 | lichess:WRljqTGS | games | 2rq1rk1/p2b1pp1/1pn2b1p/2p5/Q1Np4/N2P2P1/PP2PPBP/R4RK1 w - - 2 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"c2c4",
"e7e6",
"b1c3",
"c7c5",
"g2g3",
"g8f6",
"f1g2",
"d7d5",
"c4d5",
"e6d5",
"d2d3",
"d5d4",
"c3b1",
"b8c6",
"g1f3",
"f8e7",
"e1g1",
"e8g8",
"b1a3",
"c8e6",
"c1g5",
"h7h6",
"g5f6",
"e7f6",
"f3d2",
"a8c8",
"d2c4",
"b7b6",
"d1a4",
"e6d7"
] | false | white | middlegame | [
{
"move": "Qd1",
"line": "Qd1 Be7 Nb5 a6",
"score": "-1.46"
},
{
"move": "Qxc6",
"line": "Qxc6 Bxc6 Bxc6 Rxc6",
"score": "-9.09"
},
{
"move": "Nd6",
"line": "Nd6 Na5 Qd1 Rb8",
"score": "-1.19"
}
] | Nd6 | c4d6 | c4d6 | Nd6 | false | {"position":{"side_to_move":"white","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Bxf6 Bxf6 Nd2 Rc8 Ndc4 b6 Qa4 Bd7","opening":"A13 English Opening: Agincourt Defense","material":{"white":{"queen":1,"rook":2,"bishop":1,"knight":... | {"position": "Material is level, but Black has the bishop pair against White's two knights, and Black's pawn on d4 cramps White's centre while both kings have intact pawn cover. White's queen on a4 and bishop on g2 both attack Black's knight on c6, which is defended by Black's bishop on d7 and rook on c8; White's knigh... | Position: Material is level, but Black has the bishop pair against White's two knights, and Black's pawn on d4 cramps White's centre while both kings have intact pawn cover. White's queen on a4 and bishop on g2 both attack Black's knight on c6, which is defended by Black's bishop on d7 and rook on c8; White's knight on... | FEN: 2rq1rk1/p2b1pp1/1pn2b1p/2p5/Q1Np4/N2P2P1/PP2PPBP/R4RK1 w - - 2 16
Side to move: white
Recent moves: 14. Ndc4 b6 15. Qa4 Bd7
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Th... | Position: Material is level, but Black has the bishop pair against White's two knights, and Black's pawn on d4 cramps White's centre while both kings have intact pawn cover. White's queen on a4 and bishop on g2 both attack Black's knight on c6, which is defended by Black's bishop on d7 and rook on c8; White's knight on... | Nd6 | true | 1 | [{"cost": 0.002113175, "seconds": 35.41, "reasoning_tokens": 3191, "flags": [], "critic_cost": 0.004142095, "critic_tool_calls": 5, "false_claims": [{"quote": "with both bishops exchanged", "why": "Only Black's bishop on d7 is exchanged for White's bishop on g2; Black's bishop on f6 remains on the board."}, {"quote": "... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.009235 | false | null | null | null |
lichess:JvAtWU3H#ply46 | lichess:JvAtWU3H | games | 3r4/p1p3k1/1bp2p1p/8/4NB2/2P2P2/PPK1R2P/8 w - - 0 24 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"f1c4",
"g8f6",
"d2d4",
"f6e4",
"d4e5",
"d7d5",
"c4d5",
"f8c5",
"d5e4",
"d8d1",
"e1d1",
"c5f2",
"b1c3",
"c8g4",
"c1f4",
"a8d8",
"d1e2",
"f2b6",
"e4c6",
"b7c6",
"a1d1",
"e8g8",
"d1d8",
"f8d8",
"h1d1",
"g4f3",
"g2f3",
"d8e8"... | false | white | endgame | [
{
"move": "Bxh6+",
"line": "Bxh6+ Kxh6 Nxf6 Kg6",
"score": "+4.47"
},
{
"move": "Nd2",
"line": "Nd2 Kf7 Nc4 Rg8",
"score": "+6.78"
},
{
"move": "a4",
"line": "a4 h5 a5 Bc5",
"score": "+7.04"
}
] | a4 | a2a4 | e2g2 | Rg2+ | true | {"position":{"side_to_move":"white","move_number":24,"phase":"endgame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Re1 Ba5+ c3 Rd8+ Kc2 Bb6 Re2 h6","opening":"C56 Italian Game: Two Knights Defense, Open Variation","material":{"white":{"rook":1,"bishop":1,"knight":... | {"position": "White is a knight ahead: rook, bishop, knight and five pawns against Black's rook, bishop and five pawns. White's bishop and knight pressure h6, c7 and f6, while Black's rook controls the open d-file near White's king on c2 and Black's c-pawns are doubled.", "notes": {"Bxh6+": "Bxh6+ takes the h-pawn with... | Position: White is a knight ahead: rook, bishop, knight and five pawns against Black's rook, bishop and five pawns. White's bishop and knight pressure h6, c7 and f6, while Black's rook controls the open d-file near White's king on c2 and Black's c-pawns are doubled.
Candidates: Bxh6+, Nd2, a4
- Bxh6+ Kxh6 Nxf6 Kg6: +4.... | FEN: 3r4/p1p3k1/1bp2p1p/8/4NB2/2P2P2/PPK1R2P/8 w - - 0 24
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a knight ahead: rook, bishop, knight and five pawns against Black's rook, bishop and five pawns. White's bishop and knight pressure h6, c7 and f6, while Black's rook controls the open d-file near White's king on c2 and Black's c-pawns are doubled.
Candidates: Bxh6+, Nd2, a4
- Bxh6+ Kxh6 Nxf6 Kg6: +4.... | a4 | true | 2 | [{"cost": 0.0017048, "seconds": 25.47, "reasoning_tokens": 2499, "flags": [], "critic_cost": 0.0046465199999999995, "critic_tool_calls": 8, "false_claims": [{"quote": "...Bc5 saves it", "why": "After Bc5, the bishop on c5 is attacked by White's knight on e4 and can be captured with Nxc5; it is not safe."}, {"quote": ".... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.014495 | true | anthropic/claude-sonnet-5.5 | true | [] |
lichess:KkmRZhZu#ply22 | lichess:KkmRZhZu | games | r2q1rk1/pp1n1pbp/2p1bnp1/3p2B1/Q7/2NP1NPP/PP2PPB1/R4RK1 w - - 1 12 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"c2c4",
"g7g6",
"d2d3",
"f8g7",
"b1c3",
"g8f6",
"g2g3",
"e8g8",
"f1g2",
"c7c6",
"g1f3",
"e7e6",
"e1g1",
"d7d5",
"c4d5",
"e6d5",
"c1g5",
"c8g4",
"d1a4",
"b8d7",
"h2h3",
"g4e6"
] | false | white | opening | [
{
"move": "Qh4",
"line": "Qh4 Qb6 Rab1 Rfe8",
"score": "+0.27"
},
{
"move": "Nd4",
"line": "Nd4 Re8 e4 Nc5",
"score": "+0.19"
},
{
"move": "Bxf6",
"line": "Bxf6 Qxf6 e3 Nb6",
"score": "-0.51"
}
] | Qh4 | a4h4 | a4h4 | Qh4 | false | {"position":{"side_to_move":"white","move_number":12,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"cxd5 exd5 Bg5 Bg4 Qa4 Nbd7 h3 Be6","opening":"A10 English Opening: Great Snake Variation","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight"... | {"position": "Material is even, both kings are castled, and both sides have bishop pairs. White's bishop on g5 pressures the black knight on f6, while White's queen on a4 and knight on c3 press c6 and d5; Black's bishop on e6 targets h3.", "notes": {"Qh4": "Qh4 points at h7; ...Qb6 hits b2 and f2, and after Rab1 ...Rfe... | Position: Material is even, both kings are castled, and both sides have bishop pairs. White's bishop on g5 pressures the black knight on f6, while White's queen on a4 and knight on c3 press c6 and d5; Black's bishop on e6 targets h3.
Candidates: Qh4, Nd4, Bxf6
- Qh4 Qb6 Rab1 Rfe8: +0.27
Qh4 points at h7; ...Qb6 hits ... | FEN: r2q1rk1/pp1n1pbp/2p1bnp1/3p2B1/Q7/2NP1NPP/PP2PPB1/R4RK1 w - - 1 12
Side to move: white
Recent moves: 10. Qa4 Nbd7 11. h3 Be6
Board:
8 r . . q . r k .
7 p p . n . p b p
6 . . p . b n p .
5 . . . p . . B .
4 Q . . . . . . .
3 . . N P . N P P
2 P P . . P P B .
1 R . . . . R K .
a b c d e f g h
Find the best move fo... | Position: Material is even, both kings are castled, and both sides have bishop pairs. White's bishop on g5 pressures the black knight on f6, while White's queen on a4 and knight on c3 press c6 and d5; Black's bishop on e6 targets h3.
Candidates: Qh4, Nd4, Bxf6
- Qh4 Qb6 Rab1 Rfe8: +0.27
Qh4 points at h7; ...Qb6 hits ... | Qh4 | true | 0 | [{"cost": 0.001526175, "seconds": 24.43, "reasoning_tokens": 2031, "flags": [], "critic_cost": 0.001882725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003409 | false | null | null | null |
lichess:B6zHzdqu#ply27 | lichess:B6zHzdqu | games | r1bq1rk1/3n1pbp/2ppp1p1/3nP3/p1BP1P2/P4N2/1P1BN1PP/R2Q1RK1 b - - 2 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g7g6",
"b1c3",
"f8g7",
"e2e4",
"d7d6",
"f2f4",
"g8f6",
"g1f3",
"c7c6",
"e4e5",
"f6d5",
"f1c4",
"e7e6",
"e1g1",
"e8g8",
"c3e2",
"a7a5",
"a2a3",
"b7b5",
"c4d3",
"a5a4",
"c2c4",
"b5c4",
"d3c4",
"b8d7",
"c1d2"
] | false | black | middlegame | [
{
"move": "Qb6",
"line": "Qb6 Bxd5 exd5 Rf2",
"score": "+0.31"
},
{
"move": "dxe5",
"line": "dxe5 Bxd5 exd5 fxe5",
"score": "+0.20"
},
{
"move": "Ne7",
"line": "Ne7 Ng3 dxe5 dxe5",
"score": "+0.00"
}
] | Qb6 | d8b6 | c6c5 | c5 | true | {"position":{"side_to_move":"black","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"b5 Bd3 a4 c4 bxc4 Bxc4 Nd7 Bd2","opening":"B06 Modern Defense: Pseudo-Austrian Attack","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight"... | {"position": "Material is level and both kings are castled, but White's advanced e5-pawn makes Black's unprotected d6-pawn a target, with exd6 threatened. White's bishop on c4 attacks Black's knight on d5, which in turn attacks White's f4-pawn.", "notes": {"Qb6": "Qb6 pressures b2 and d4; White answers Bxd5, and after ... | Position: Material is level and both kings are castled, but White's advanced e5-pawn makes Black's unprotected d6-pawn a target, with exd6 threatened. White's bishop on c4 attacks Black's knight on d5, which in turn attacks White's f4-pawn.
Candidates: Qb6, dxe5, Ne7
- Qb6 Bxd5 exd5 Rf2: +0.31
Qb6 pressures b2 and d4... | FEN: r1bq1rk1/3n1pbp/2ppp1p1/3nP3/p1BP1P2/P4N2/1P1BN1PP/R2Q1RK1 b - - 2 14
Side to move: black
Recent moves: 12... bxc4 13. Bxc4 Nd7 14. Bd2
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one... | Position: Material is level and both kings are castled, but White's advanced e5-pawn makes Black's unprotected d6-pawn a target, with exd6 threatened. White's bishop on c4 attacks Black's knight on d5, which in turn attacks White's f4-pawn.
Candidates: Qb6, dxe5, Ne7
- Qb6 Bxd5 exd5 Rf2: +0.31
Qb6 pressures b2 and d4... | Qb6 | true | 0 | [{"cost": 0.00162355, "seconds": 21.42, "reasoning_tokens": 2159, "flags": [], "critic_cost": 0.002240475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003864 | true | anthropic/claude-sonnet-5.5 | true | [] |
lichess:ndpOjsE0#ply32 | lichess:ndpOjsE0 | games | r3r1k1/2pqb1p1/p1n2p1p/1p1bp3/8/1BPP1N1P/PP3PP1/R1BQR1K1 w - - 0 17 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"f1b5",
"a7a6",
"b5a4",
"g8f6",
"d2d3",
"d7d6",
"c2c3",
"f8e7",
"b1d2",
"b7b5",
"a4c2",
"e8g8",
"d2f1",
"h7h6",
"h2h3",
"f8e8",
"f1e3",
"c8e6",
"e1g1",
"d6d5",
"e4d5",
"f6d5",
"f1e1",
"f7f6",
"c2b3",
"d8d7",
"e3d5",
"e6d5"... | false | white | middlegame | [
{
"move": "Nxe5",
"line": "Nxe5 Nxe5 Bxh6 Bxb3",
"score": "-5.38"
},
{
"move": "d4",
"line": "d4 exd4 Nxd4 Bxb3",
"score": "+0.05"
},
{
"move": "a4",
"line": "a4 Rad8 d4 exd4",
"score": "-0.01"
}
] | d4 | d3d4 | d3d4 | d4 | false | {"position":{"side_to_move":"white","move_number":17,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"exd5 Nxd5 Re1 f6 Bb3 Qd7 Nxd5 Bxd5","opening":"C77 Ruy Lopez: Morphy Defense, Anderssen Variation","material":{"white":{"queen":1,"rook":2,"bishop... | {"position": "Material is level, and both kings have intact pawn shields. White's rook on e1 and knight on f3 pressure e5, while Black's bishop on d5 attacks White's bishop on b3 and knight on f3, and Black's queen eyes h3.", "notes": {"Nxe5": "Nxe5 takes the e5-pawn and attacks the c6-knight and d7-queen, but ...Nxe5 ... | Position: Material is level, and both kings have intact pawn shields. White's rook on e1 and knight on f3 pressure e5, while Black's bishop on d5 attacks White's bishop on b3 and knight on f3, and Black's queen eyes h3.
Candidates: Nxe5, d4, a4
- Nxe5 Nxe5 Bxh6 Bxb3: -5.38
Nxe5 takes the e5-pawn and attacks the c6-kn... | FEN: r3r1k1/2pqb1p1/p1n2p1p/1p1bp3/8/1BPP1N1P/PP3PP1/R1BQR1K1 w - - 0 17
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, and both kings have intact pawn shields. White's rook on e1 and knight on f3 pressure e5, while Black's bishop on d5 attacks White's bishop on b3 and knight on f3, and Black's queen eyes h3.
Candidates: Nxe5, d4, a4
- Nxe5 Nxe5 Bxh6 Bxb3: -5.38
Nxe5 takes the e5-pawn and attacks the c6-kn... | d4 | true | 1 | [{"cost": 0.002117175, "seconds": 33.91, "reasoning_tokens": 3147, "flags": [], "critic_cost": 0.003428225, "critic_tool_calls": 0, "false_claims": [{"quote": "maintain pressure on e5", "why": "After 1.d4 exd4 2.Nxd4, White's knight captures Black's e-pawn on d4, so there is no pawn on e5 to pressure."}, {"quote": "mai... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.008399 | false | null | null | null |
lichess:C01sPU93#ply31 | lichess:C01sPU93 | games | 1rb2rk1/4ppbp/3p2p1/qp1Pn3/1B6/5P2/PPN1B1PP/R2Q1RK1 b - - 1 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"b8c6",
"d2d4",
"c5d4",
"f3d4",
"g7g6",
"c2c4",
"f8g7",
"d4c2",
"g8f6",
"b1c3",
"e8g8",
"f1e2",
"d8a5",
"e1g1",
"a7a6",
"c1e3",
"a8b8",
"f2f3",
"b7b5",
"c4b5",
"a6b5",
"c3d5",
"f6d5",
"e4d5",
"c6e5",
"e3c5",
"d7d6",
"c5b4"
] | false | black | middlegame | [
{
"move": "Qc7",
"line": "Qc7 Qd2 Nc4 Bxc4",
"score": "+0.68"
},
{
"move": "Qa7+",
"line": "Qa7+ Kh1 Nc4 a4",
"score": "+1.39"
},
{
"move": "Qb6+",
"line": "Qb6+ Kh1 Bf5 Nd4",
"score": "+1.07"
},
{
"move": "Qxb4",
"line": "Qxb4 Nxb4 Bd7 Qe1",
"score": "-6.... | Qa7+ | a5a7 | a5a7 | Qa7+ | false | {"position":{"side_to_move":"black","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"axb5 Nd5 Nxd5 exd5 Ne5 Bc5 d6 Bb4","opening":"B37 Sicilian Defense: Accelerated Dragon, Mar\u00f3czy Bind","material":{"white":{"queen":1,"rook":2... | {"position": "Material is even and both kings are castled; both sides have the bishop pair, with White's advanced d5-pawn and Black's active knight on e5 attacking f3. White's bishop on b4 attacks Black's queen on a5 as the queen attacks that bishop, so White threatens Bxa5.", "notes": {"Qc7": "Qc7 attacks White's knig... | Position: Material is even and both kings are castled; both sides have the bishop pair, with White's advanced d5-pawn and Black's active knight on e5 attacking f3. White's bishop on b4 attacks Black's queen on a5 as the queen attacks that bishop, so White threatens Bxa5.
Candidates: Qc7, Qa7+, Qb6+, Qxb4
- Qc7 Qd2 Nc4 ... | FEN: 1rb2rk1/4ppbp/3p2p1/qp1Pn3/1B6/5P2/PPN1B1PP/R2Q1RK1 b - - 1 16
Side to move: black
Recent moves: 14... Ne5 15. Bc5 d6 16. Bb4
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. ... | Position: Material is even and both kings are castled; both sides have the bishop pair, with White's advanced d5-pawn and Black's active knight on e5 attacking f3. White's bishop on b4 attacks Black's queen on a5 as the queen attacks that bishop, so White threatens Bxa5.
Candidates: Qc7, Qa7+, Qb6+, Qxb4
- Qc7 Qd2 Nc4 ... | Qa7+ | true | 1 | [{"cost": 0.004883675, "seconds": 71.5, "reasoning_tokens": 8630, "flags": ["move not on the shown lines: Bxe2", "move not on the shown lines: Qxe2"]}, {"cost": 0.000733035, "seconds": 10.29, "reasoning_tokens": 928, "flags": [], "critic_cost": 0.005532464999999999, "critic_tool_calls": 5, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.011149 | false | null | null | null |
lichess:D10PRhUI#ply26 | lichess:D10PRhUI | games | r4rk1/ppqb1pp1/2n1pn1p/3p4/1P6/P1NBPN1P/2P2PP1/R2Q1RK1 w - - 0 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"b1c3",
"g8f6",
"c1f4",
"e7e6",
"e2e3",
"f8d6",
"g1f3",
"c7c5",
"d4c5",
"d6c5",
"f1b5",
"c8d7",
"e1g1",
"e8g8",
"b5d3",
"b8c6",
"h2h3",
"h7h6",
"a2a3",
"c5b6",
"b2b4",
"b6c7",
"f4c7",
"d8c7"
] | false | white | middlegame | [
{
"move": "Nb5",
"line": "Nb5 Qb6 Nc3 Ne7",
"score": "-0.51"
},
{
"move": "Bh7+",
"line": "Bh7+ Kxh7 Nb5 Qb8",
"score": "-7.74"
},
{
"move": "Ne2",
"line": "Ne2 Rfd8 Rc1 e5",
"score": "-0.53"
}
] | Nb5 | c3b5 | c3b5 | Nb5 | false | {"position":{"side_to_move":"white","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"h3 h6 a3 Bb6 b4 Bc7 Bxc7 Qxc7","opening":"D01 Rapport-Jobava System","material":{"white":{"queen":1,"rook":2,"bishop":1,"knight":2,"pawn":7,"point... | {"position": "Material is level, and both kings are castled behind intact pawn shields. White has gained queenside space with b4 and can target d5, while Black's knight on c6 pressures b4 and the d5-e6 centre gives Black counterplay.", "notes": {"Nb5": "Nb5 attacks Black's queen on c7 and pawn on a7; ...Qb6 attacks the... | Position: Material is level, and both kings are castled behind intact pawn shields. White has gained queenside space with b4 and can target d5, while Black's knight on c6 pressures b4 and the d5-e6 centre gives Black counterplay.
Candidates: Nb5, Bh7+, Ne2
- Nb5 Qb6 Nc3 Ne7: -0.51
Nb5 attacks Black's queen on c7 and ... | FEN: r4rk1/ppqb1pp1/2n1pn1p/3p4/1P6/P1NBPN1P/2P2PP1/R2Q1RK1 w - - 0 14
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, and both kings are castled behind intact pawn shields. White has gained queenside space with b4 and can target d5, while Black's knight on c6 pressures b4 and the d5-e6 centre gives Black counterplay.
Candidates: Nb5, Bh7+, Ne2
- Nb5 Qb6 Nc3 Ne7: -0.51
Nb5 attacks Black's queen on c7 and ... | Nb5 | true | 0 | [{"cost": 0.001471925, "seconds": 19.09, "reasoning_tokens": 2000, "flags": [], "critic_cost": 0.001319475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.002791 | false | null | null | null |
lichess:zXrAUZPz#ply15 | lichess:zXrAUZPz | games | r1bq1rk1/pp2ppbp/2np1np1/2pP4/2P5/2N2NP1/PP2PPBP/R1BQ1RK1 b - - 0 8 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"g2g3",
"g7g6",
"f1g2",
"f8g7",
"g1f3",
"g8f6",
"e1g1",
"e8g8",
"d2d4",
"d7d6",
"c2c4",
"c7c5",
"b1c3",
"b8c6",
"d4d5"
] | false | black | opening | [
{
"move": "Na5",
"line": "Na5 Nd2 Rb8 Qc2",
"score": "-0.42"
},
{
"move": "Nxd5",
"line": "Nxd5 Nxd5 Rb8 Nd2",
"score": "-6.02"
},
{
"move": "Nb8",
"line": "Nb8 Re1 Nbd7 Qc2",
"score": "-0.99"
},
{
"move": "Ne5",
"line": "Ne5 Nxe5 dxe5 Qb3",
"score": "-0.8... | Na5 | c6a5 | c6a5 | Na5 | false | {"position":{"side_to_move":"black","move_number":8,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"O-O d4 d6 c4 c5 Nc3 Nc6 d5","opening":"E66 King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line","material":{"white":{"queen"... | {"position": "Material is even, and both kings are castled; the bishops on c1 and c8 remain undeveloped. White's pawn on d5 attacks Black's knight on c6, while Black's knight on f6 attacks d5, so White threatens dxc6 if the knight stays there.", "notes": {"Na5": "Na5 moves the attacked knight and attacks White's c4-paw... | Position: Material is even, and both kings are castled; the bishops on c1 and c8 remain undeveloped. White's pawn on d5 attacks Black's knight on c6, while Black's knight on f6 attacks d5, so White threatens dxc6 if the knight stays there.
Candidates: Na5, Nxd5, Nb8, Ne5
- Na5 Nd2 Rb8 Qc2: -0.42
Na5 moves the attacke... | FEN: r1bq1rk1/pp2ppbp/2np1np1/2pP4/2P5/2N2NP1/PP2PPBP/R1BQ1RK1 b - - 0 8
Side to move: black
Recent moves: 6... c5 7. Nc3 Nc6 8. d5
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best.... | Position: Material is even, and both kings are castled; the bishops on c1 and c8 remain undeveloped. White's pawn on d5 attacks Black's knight on c6, while Black's knight on f6 attacks d5, so White threatens dxc6 if the knight stays there.
Candidates: Na5, Nxd5, Nb8, Ne5
- Na5 Nd2 Rb8 Qc2: -0.42
Na5 moves the attacke... | Na5 | true | 0 | [{"cost": 0.0022463, "seconds": 34.36, "reasoning_tokens": 3406, "flags": [], "critic_cost": 0.0022639749999999997, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00451 | false | null | null | null |
lichess:VVp49NMf#ply30 | lichess:VVp49NMf | games | r2q1rk1/1bp1bppp/p7/4N3/1p1n1B2/3B3P/PP3PP1/R2Q1RK1 w - - 0 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"d2d4",
"e5d4",
"f1c4",
"f8e7",
"c2c3",
"d7d6",
"c3d4",
"g8f6",
"b1c3",
"e8g8",
"e1g1",
"a7a6",
"h2h3",
"b7b5",
"c4d3",
"b5b4",
"c3e2",
"c8b7",
"e4e5",
"d6e5",
"f3e5",
"f6d5",
"e2f4",
"d5f4",
"c1f4",
"c6d4"
] | false | white | middlegame | [
{
"move": "Qg4",
"line": "Qg4 Bc8 Qh5 g6",
"score": "+0.04"
},
{
"move": "Bxa6",
"line": "Bxa6 Rxa6 Be3 Qd5",
"score": "-7.59"
},
{
"move": "Bc4",
"line": "Bc4 c5 Re1 Bd5",
"score": "-0.47"
}
] | Qg4 | d1g4 | f1e1 | Re1 | true | {"position":{"side_to_move":"white","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"e5 dxe5 Nxe5 Nd5 Nf4 Nxf4 Bxf4 Nxd4","opening":"C44 Scotch Game: Benima Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":1,"pa... | {"position": "White is a pawn down, with queens, two rooks and two bishops each; White's knight on e5 eyes f7 and the bishop on d3 targets h7, while Black has a centralized knight on d4 and an advanced pawn on b4. Both kings are castled, but Black's bishop on b7 attacks g2, and the open d- and e-files make piece activi... | Position: White is a pawn down, with queens, two rooks and two bishops each; White's knight on e5 eyes f7 and the bishop on d3 targets h7, while Black has a centralized knight on d4 and an advanced pawn on b4. Both kings are castled, but Black's bishop on b7 attacks g2, and the open d- and e-files make piece activity i... | FEN: r2q1rk1/1bp1bppp/p7/4N3/1p1n1B2/3B3P/PP3PP1/R2Q1RK1 w - - 0 16
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a pawn down, with queens, two rooks and two bishops each; White's knight on e5 eyes f7 and the bishop on d3 targets h7, while Black has a centralized knight on d4 and an advanced pawn on b4. Both kings are castled, but Black's bishop on b7 attacks g2, and the open d- and e-files make piece activity i... | Qg4 | true | 0 | [{"cost": 0.001495425, "seconds": 19.04, "reasoning_tokens": 1981, "flags": [], "critic_cost": 0.002242725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003738 | false | null | null | null |
lichess:bmPeHiGs#ply37 | lichess:bmPeHiGs | games | rn1q1r1k/p5bp/1p2Q1p1/4Pp2/3P4/5N2/PP3BPP/RN3K2 b - - 0 19 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d6",
"e2e3",
"g7g6",
"f2f4",
"f8g7",
"f1d3",
"b7b6",
"e3e4",
"c8b7",
"g1f3",
"e7e6",
"d1e2",
"g8e7",
"e1g1",
"e8g8",
"c1e3",
"c7c5",
"c2c3",
"c5d4",
"c3d4",
"f7f5",
"e4e5",
"d6e5",
"f4e5",
"e7d5",
"e3f2",
"d5f4",
"e2e3",
"f4d3",
"e3d3",
"b7a6"... | false | black | middlegame | [
{
"move": "Qxd4",
"line": "Qxd4 Bxd4 Na6 Na3",
"score": "-9.02"
},
{
"move": "Re8",
"line": "Re8 Qb3 Nc6 Nc3",
"score": "-0.69"
},
{
"move": "Na6",
"line": "Na6 Nc3 g5 Re1",
"score": "-0.62"
}
] | Na6 | b8a6 | g6g5 | g5 | true | {"position":{"side_to_move":"black","move_number":19,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Nxd3 Qxd3 Ba6 Qb3 Bxf1 Qxe6+ Kh8 Kxf1","opening":"A41 Queen's Pawn Game","material":{"white":{"queen":1,"rook":1,"bishop":1,"knight":2,"pawn":6,"p... | {"position": "Black has an extra rook for White's extra knight, while White has one more pawn; both sides also have a queen and bishop. White's queen on e6 targets b6, f5, and g6, while Black's queen eyes d4 and the bishop on g7 attacks e5; Black's king is sheltered on h8, but the b8 knight is undeveloped and White's k... | Position: Black has an extra rook for White's extra knight, while White has one more pawn; both sides also have a queen and bishop. White's queen on e6 targets b6, f5, and g6, while Black's queen eyes d4 and the bishop on g7 attacks e5; Black's king is sheltered on h8, but the b8 knight is undeveloped and White's king ... | FEN: rn1q1r1k/p5bp/1p2Q1p1/4Pp2/3P4/5N2/PP3BPP/RN3K2 b - - 0 19
Side to move: black
Recent moves: 17... Bxf1 18. Qxe6+ Kh8 19. Kxf1
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best.... | Position: Black has an extra rook for White's extra knight, while White has one more pawn; both sides also have a queen and bishop. White's queen on e6 targets b6, f5, and g6, while Black's queen eyes d4 and the bishop on g7 attacks e5; Black's king is sheltered on h8, but the b8 knight is undeveloped and White's king ... | Na6 | true | 0 | [{"cost": 0.00164605, "seconds": 22.83, "reasoning_tokens": 2302, "flags": [], "critic_cost": 0.001681475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003327 | false | null | null | null |
lichess:MdkxZOZ9#ply24 | lichess:MdkxZOZ9 | games | r1b1k2r/pp2qpb1/1n2pp1p/3P3Q/2B5/2N2N2/PP3PPP/R4RK1 w kq - 1 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"c2c4",
"g8f6",
"b1c3",
"c7c6",
"c1g5",
"d5c4",
"e2e4",
"h7h6",
"g5f6",
"g7f6",
"f1c4",
"f8g7",
"d1h5",
"e7e6",
"g1f3",
"d8e7",
"e1g1",
"b8d7",
"d4d5",
"c6d5",
"e4d5",
"d7b6"
] | false | white | middlegame | [
{
"move": "dxe6",
"line": "dxe6 Kf8 Rfe1 fxe6",
"score": "+5.51"
},
{
"move": "Qxf7+",
"line": "Qxf7+ Kxf7 Bb3 Kg8",
"score": "-6.46"
},
{
"move": "Bb3",
"line": "Bb3 O-O dxe6 Bxe6",
"score": "+3.38"
}
] | dxe6 | d5e6 | d5e6 | dxe6 | false | {"position":{"side_to_move":"white","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nf3 Qe7 O-O Nd7 d5 cxd5 exd5 Nb6","opening":"D06 Queen's Gambit Declined: Marshall Defense","material":{"white":{"queen":1,"rook":2,"... | {"position": "Material is level, but White's queen on h5 pins the black pawn on f7 and White's pawn on d5 pressures e6, while Black's king remains in the centre. Black's knight on b6 attacks White's bishop on c4, making ...Nxc4 the immediate threat; White's king is safely castled.", "notes": {"dxe6": "dxe6 takes the pa... | Position: Material is level, but White's queen on h5 pins the black pawn on f7 and White's pawn on d5 pressures e6, while Black's king remains in the centre. Black's knight on b6 attacks White's bishop on c4, making ...Nxc4 the immediate threat; White's king is safely castled.
Candidates: dxe6, Qxf7+, Bb3
- dxe6 Kf8 Rf... | FEN: r1b1k2r/pp2qpb1/1n2pp1p/3P3Q/2B5/2N2N2/PP3PPP/R4RK1 w kq - 1 13
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, but White's queen on h5 pins the black pawn on f7 and White's pawn on d5 pressures e6, while Black's king remains in the centre. Black's knight on b6 attacks White's bishop on c4, making ...Nxc4 the immediate threat; White's king is safely castled.
Candidates: dxe6, Qxf7+, Bb3
- dxe6 Kf8 Rf... | dxe6 | true | 1 | [{"cost": 0.00273805, "seconds": 44.69, "reasoning_tokens": 4409, "flags": [], "critic_cost": 0.007086535, "critic_tool_calls": 7, "false_claims": [{"quote": "...Kf8 sidesteps that threat", "why": "After ...Kf8, Qxf7+ is still available: the white pawn on e6 protects the queen on f7, so the black king cannot capture it... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.019789 | false | null | null | null |
lichess:2NAVBJ8C#ply30 | lichess:2NAVBJ8C | games | r3r1k1/1b1qppbp/2p2np1/1p6/p2P4/2P3N1/PPB1QPPP/R1B1R1K1 w - - 4 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"d2d4",
"d7d5",
"b1d2",
"d5e4",
"d2e4",
"g8f6",
"e4g3",
"g7g6",
"g1f3",
"f8g7",
"f1c4",
"e8g8",
"e1g1",
"b7b5",
"c4b3",
"a7a5",
"c2c3",
"a5a4",
"b3c2",
"c8b7",
"f3e5",
"b8d7",
"e5d7",
"d8d7",
"f1e1",
"f8d8",
"d1e2",
"d8e8"
] | false | white | middlegame | [
{
"move": "Bd3",
"line": "Bd3 Qc7 Bd2 Rad8",
"score": "-0.23"
},
{
"move": "a3",
"line": "a3 Qc7 Bg5 Nd5",
"score": "-0.15"
},
{
"move": "Bxg6",
"line": "Bxg6 hxg6 h4 Qd5",
"score": "-6.86"
},
{
"move": "Bd2",
"line": "Bd2 c5 dxc5 Qc6",
"score": "-0.18"
... | a3 | a2a3 | a2a3 | a3 | false | {"position":{"side_to_move":"white","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Ne5 Nbd7 Nxd7 Qxd7 Re1 Rfd8 Qe2 Re8","opening":"B15 Caro-Kann Defense: Main Line","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":1,"p... | {"position": "White and Black are materially even, each with two bishops, and White still has the bishop on c1 undeveloped. Black's queen attacks d4, while White's bishop on c2 eyes a4 and g6; Black can add pressure with ...c5 or ...Rad8.", "notes": {"Bd3": "Bd3 brings the c2 bishop onto the b5 and g6 diagonals; ...Qc7... | Position: White and Black are materially even, each with two bishops, and White still has the bishop on c1 undeveloped. Black's queen attacks d4, while White's bishop on c2 eyes a4 and g6; Black can add pressure with ...c5 or ...Rad8.
Candidates: Bd3, a3, Bxg6, Bd2
- Bd3 Qc7 Bd2 Rad8: -0.23
Bd3 brings the c2 bishop o... | FEN: r3r1k1/1b1qppbp/2p2np1/1p6/p2P4/2P3N1/PPB1QPPP/R1B1R1K1 w - - 4 16
Side to move: white
Recent moves: 14. Re1 Rfd8 15. Qe2 Re8
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. ... | Position: White and Black are materially even, each with two bishops, and White still has the bishop on c1 undeveloped. Black's queen attacks d4, while White's bishop on c2 eyes a4 and g6; Black can add pressure with ...c5 or ...Rad8.
Candidates: Bd3, a3, Bxg6, Bd2
- Bd3 Qc7 Bd2 Rad8: -0.23
Bd3 brings the c2 bishop o... | a3 | true | 0 | [{"cost": 0.001691925, "seconds": 24.44, "reasoning_tokens": 2324, "flags": [], "critic_cost": 0.00255155, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004244 | false | null | null | null |
lichess:9qeSvXGM#ply24 | lichess:9qeSvXGM | games | 1rb2rk1/p2nqppp/2p1p3/3pP3/N2p4/1P3N2/P1P2PPP/R2Q1RK1 w - - 0 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"b1c3",
"d7d5",
"g1f3",
"g8f6",
"e4e5",
"f6d7",
"d2d4",
"c7c5",
"f1b5",
"b8c6",
"b5c6",
"b7c6",
"e1g1",
"a8b8",
"b2b3",
"f8e7",
"c3a4",
"e8g8",
"c1a3",
"c5d4",
"a3e7",
"d8e7"
] | false | white | middlegame | [
{
"move": "Qe2",
"line": "Qe2 c5 Rfe1 Bb7",
"score": "-2.35"
},
{
"move": "Qxd4",
"line": "Qxd4 c5 Qg4 Bb7",
"score": "-0.54"
},
{
"move": "Re1",
"line": "Re1 c5 Qd2 Ba6",
"score": "-2.20"
},
{
"move": "Nxd4",
"line": "Nxd4 Bb7 f4 c5",
"score": "-0.58"
}... | Qxd4 | d1d4 | d1d4 | Qxd4 | false | {"position":{"side_to_move":"white","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"b3 Be7 Na4 O-O Ba3 cxd4 Bxe7 Qxe7","opening":"C00 French Defense: Two Knights Variation","material":{"white":{"queen":1,"rook":2,"knight":2,"pawn"... | {"position": "White is a pawn down, but the black pawn on d4 is loose: White's queen on d1 and knight on f3 both attack it. Both kings are castled behind three-pawn shields; Black's rook on b8 bears on b3, and the knight on d7 attacks White's e5 pawn.", "notes": {"Qe2": "Qe2 leaves d4 untaken; ...c5 protects that pawn,... | Position: White is a pawn down, but the black pawn on d4 is loose: White's queen on d1 and knight on f3 both attack it. Both kings are castled behind three-pawn shields; Black's rook on b8 bears on b3, and the knight on d7 attacks White's e5 pawn.
Candidates: Qe2, Qxd4, Re1, Nxd4
- Qe2 c5 Rfe1 Bb7: -2.35
Qe2 leaves d... | FEN: 1rb2rk1/p2nqppp/2p1p3/3pP3/N2p4/1P3N2/P1P2PPP/R2Q1RK1 w - - 0 13
Side to move: white
Recent moves: 11. Ba3 cxd4 12. Bxe7 Qxe7
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. ... | Position: White is a pawn down, but the black pawn on d4 is loose: White's queen on d1 and knight on f3 both attack it. Both kings are castled behind three-pawn shields; Black's rook on b8 bears on b3, and the knight on d7 attacks White's e5 pawn.
Candidates: Qe2, Qxd4, Re1, Nxd4
- Qe2 c5 Rfe1 Bb7: -2.35
Qe2 leaves d... | Qxd4 | true | 0 | [{"cost": 0.002689175, "seconds": 44.97, "reasoning_tokens": 4354, "flags": [], "critic_cost": 0.0041351949999999995, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006824 | false | null | null | null |
lichess:lbBcuvk6#ply31 | lichess:lbBcuvk6 | games | r2qk3/p2n1rR1/1pn1p1Q1/3pP1P1/3p4/2N5/PPP3P1/R1B1K3 b Qq - 0 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"b1c3",
"d7d5",
"d2d4",
"g8f6",
"f1d3",
"f8e7",
"e4e5",
"f6d7",
"f2f4",
"b7b6",
"g1f3",
"c8a6",
"h2h4",
"c7c5",
"f4f5",
"a6d3",
"d1d3",
"b8c6",
"f5e6",
"f7e6",
"f3g5",
"e7g5",
"h4g5",
"c5d4",
"h1h7",
"h8f8",
"d3g6",
"f8f7",
"h7g7"
] | false | black | middlegame | [
{
"move": "Ndxe5",
"line": "Ndxe5 Qxe6+ Qe7 Rg8+",
"score": "-1.29"
},
{
"move": "Qxg5",
"line": "Qxg5 Qxf7+ Kd8 Qxd7#",
"score": "#-2"
},
{
"move": "Ncxe5",
"line": "Ncxe5 Qxe6+ Re7 Qg8+",
"score": "-2.09"
}
] | Ndxe5 | d7e5 | d7e5 | Ndxe5 | false | {"position":{"side_to_move":"black","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O-O"],"black":["O-O-O"]},"en_passant_square":null,"recent_moves":"Bxg5 hxg5 cxd4 Rxh7 Rf8 Qg6+ Rf7 Rxg7","opening":"C11 French Defense: Classical Variation, Swiss Variation","material":{"white":{"qu... | {"position": "White is a pawn up, with a bishop and knight against Black's two knights. White's queen on g6 and rook on g7 threaten Qxf7#, while Black's rook on f7 is under fire; Black can take e5, and the d4-pawn attacks White's knight on c3.", "notes": {"Ndxe5": "Black's d7-knight takes e5 and attacks White's queen; ... | Position: White is a pawn up, with a bishop and knight against Black's two knights. White's queen on g6 and rook on g7 threaten Qxf7#, while Black's rook on f7 is under fire; Black can take e5, and the d4-pawn attacks White's knight on c3.
Candidates: Ndxe5, Qxg5, Ncxe5
- Ndxe5 Qxe6+ Qe7 Rg8+: -1.29
Black's d7-knight... | FEN: r2qk3/p2n1rR1/1pn1p1Q1/3pP1P1/3p4/2N5/PPP3P1/R1B1K3 b Qq - 0 16
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a pawn up, with a bishop and knight against Black's two knights. White's queen on g6 and rook on g7 threaten Qxf7#, while Black's rook on f7 is under fire; Black can take e5, and the d4-pawn attacks White's knight on c3.
Candidates: Ndxe5, Qxg5, Ncxe5
- Ndxe5 Qxe6+ Qe7 Rg8+: -1.29
Black's d7-knight... | Ndxe5 | true | 0 | [{"cost": 0.003754175, "seconds": 57.44, "reasoning_tokens": 6376, "flags": [], "critic_cost": 0.0026922250000000003, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006446 | false | null | null | null |
lichess:QJXCrOtm#ply36 | lichess:QJXCrOtm | games | 2r2rk1/p3bppp/1qp5/3nN3/Q7/8/PP3PPP/R1BR2K1 w - - 4 19 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"g1f3",
"d7d5",
"b1c3",
"d5d4",
"c3e2",
"c7c5",
"c2c3",
"b8c6",
"c3d4",
"c5d4",
"d1a4",
"d4d3",
"e2d4",
"c8d7",
"f1d3",
"g8f6",
"e1g1",
"f8c5",
"d4c6",
"d7c6",
"d3b5",
"d8b6",
"b5c6",
"b7c6",
"d2d4",
"c5e7",
"d4d5",
"e6d5",
"e4d5",
"f6d5"... | false | white | middlegame | [
{
"move": "Qc2",
"line": "Qc2 Qb5 Bd2 Nb6",
"score": "+0.19"
},
{
"move": "Rxd5",
"line": "Rxd5 cxd5 h3 Rfd8",
"score": "-5.61"
},
{
"move": "Nd7",
"line": "Nd7 Qc7 Nxf8 Bc5",
"score": "+4.94"
}
] | Nd7 | e5d7 | e5d7 | Nd7 | false | {"position":{"side_to_move":"white","move_number":19,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"d5 exd5 exd5 Nxd5 Ne5 Rc8 Rd1 O-O","opening":"C00 French Defense: Two Knights Variation","material":{"white":{"queen":1,"rook":2,"bishop":1,"knigh... | {"position": "Material is level, with both sides holding a queen, two rooks, a bishop, a knight and five pawns. White's rook on d1 attacks Black's knight on d5, and White's knight on e5 hits c6 and f7; Black's queen on b6 attacks b2 and f2, while White's bishop on c1 is still undeveloped.", "notes": {"Qc2": "Qc2 keeps ... | Position: Material is level, with both sides holding a queen, two rooks, a bishop, a knight and five pawns. White's rook on d1 attacks Black's knight on d5, and White's knight on e5 hits c6 and f7; Black's queen on b6 attacks b2 and f2, while White's bishop on c1 is still undeveloped.
Candidates: Qc2, Rxd5, Nd7
- Qc2 Q... | FEN: 2r2rk1/p3bppp/1qp5/3nN3/Q7/8/PP3PPP/R1BR2K1 w - - 4 19
Side to move: white
Recent moves: 17. Ne5 Rc8 18. Rd1 O-O
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer w... | Position: Material is level, with both sides holding a queen, two rooks, a bishop, a knight and five pawns. White's rook on d1 attacks Black's knight on d5, and White's knight on e5 hits c6 and f7; Black's queen on b6 attacks b2 and f2, while White's bishop on c1 is still undeveloped.
Candidates: Qc2, Rxd5, Nd7
- Qc2 Q... | Nd7 | true | 0 | [{"cost": 0.001471425, "seconds": 20.47, "reasoning_tokens": 1951, "flags": [], "critic_cost": 0.003607245, "critic_tool_calls": 5, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005078 | false | null | null | null |
lichess:xsy8Elar#ply38 | lichess:xsy8Elar | games | 6k1/ppprpp1p/2b3p1/8/2B2b2/2P1NP1P/PPK3P1/4R3 w - - 0 20 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"d7d6",
"g1f3",
"g8f6",
"b1c3",
"g7g6",
"d2d4",
"f8g7",
"e4e5",
"d6e5",
"d4e5",
"d8d1",
"c3d1",
"f6g4",
"c1f4",
"b8d7",
"h2h3",
"g4e5",
"f4e5",
"d7e5",
"f3e5",
"g7e5",
"c2c3",
"e8g8",
"f1c4",
"c8d7",
"d1e3",
"d7c6",
"e1c1",
"a8d8",
"f2f3",
"e5f4"... | false | white | endgame | [
{
"move": "b4",
"line": "b4 a6 Bb3 e6",
"score": "-3.11"
},
{
"move": "Bxf7+",
"line": "Bxf7+ Kxf7 Re2 Bxe3",
"score": "-5.52"
}
] | b4 | b2b4 | b2b3 | b3 | true | {"position":{"side_to_move":"white","move_number":20,"phase":"endgame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"f3 Bf4 Rhe1 Rd7 Kc2 Rfd8 Rxd7 Rxd7","opening":"B08 Pirc Defense: Classical Variation","material":{"white":{"rook":1,"bishop":1,"knight":1,"pawn":6,"p... | {"position": "White is a pawn down against Black's rook, two bishops, and seven pawns. White's rook on e1 uses the half-open e-file while Black's rook controls the open d-file; White's bishop on c4 pins the f7-pawn against the king on g8, but Black's bishop on f4 attacks White's knight on e3 and the bishop on c6 eyes f... | Position: White is a pawn down against Black's rook, two bishops, and seven pawns. White's rook on e1 uses the half-open e-file while Black's rook controls the open d-file; White's bishop on c4 pins the f7-pawn against the king on g8, but Black's bishop on f4 attacks White's knight on e3 and the bishop on c6 eyes f3.
C... | FEN: 6k1/ppprpp1p/2b3p1/8/2B2b2/2P1NP1P/PPK3P1/4R3 w - - 0 20
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a pawn down against Black's rook, two bishops, and seven pawns. White's rook on e1 uses the half-open e-file while Black's rook controls the open d-file; White's bishop on c4 pins the f7-pawn against the king on g8, but Black's bishop on f4 attacks White's knight on e3 and the bishop on c6 eyes f3.
C... | b4 | true | 0 | [{"cost": 0.001760175, "seconds": 27.18, "reasoning_tokens": 2673, "flags": [], "critic_cost": 0.002170795, "critic_tool_calls": 5, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003931 | false | null | null | null |
lichess:f8AEtUNH#ply14 | lichess:f8AEtUNH | games | rnbq1rk1/pp2bppp/4pn2/2pp4/2PP4/4P1N1/PP1B1PPP/R2QKBNR w KQ - 0 8 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c2c4",
"e7e6",
"b1c3",
"f8b4",
"c1d2",
"e8g8",
"c3e4",
"b4e7",
"e4g3",
"d7d5",
"e2e3",
"c7c5"
] | false | white | opening | [
{
"move": "Nf3",
"line": "Nf3 cxd4 Nxd4 Nc6",
"score": "-0.28"
},
{
"move": "cxd5",
"line": "cxd5 cxd4 exd4 Qxd5",
"score": "-1.38"
},
{
"move": "dxc5",
"line": "dxc5 Nbd7 b4 a5",
"score": "-0.16"
}
] | dxc5 | d4c5 | d4c5 | dxc5 | false | {"position":{"side_to_move":"white","move_number":8,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Bd2 O-O Ne4 Be7 Ng3 d5 e3 c5","opening":"E20 Nimzo-Indian Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":8... | {"position": "Material is level, but Black's king is castled while White's king remains on e1 and White's f1-bishop and g1-knight are undeveloped. White's c4- and d4-pawns are in contact with Black's d5- and c5-pawns, and Black can capture on d4 or c4.", "notes": {"Nf3": "Nf3 develops White's g1-knight and reinforces d... | Position: Material is level, but Black's king is castled while White's king remains on e1 and White's f1-bishop and g1-knight are undeveloped. White's c4- and d4-pawns are in contact with Black's d5- and c5-pawns, and Black can capture on d4 or c4.
Candidates: Nf3, cxd5, dxc5
- Nf3 cxd4 Nxd4 Nc6: -0.28
Nf3 develops W... | FEN: rnbq1rk1/pp2bppp/4pn2/2pp4/2PP4/4P1N1/PP1B1PPP/R2QKBNR w KQ - 0 8
Side to move: white
Recent moves: 4. Bd2 O-O 5. Ne4 Be7 6. Ng3 d5 7. e3 c5
Board:
8 r n b q . r k .
7 p p . . b p p p
6 . . . . p n . .
5 . . p p . . . .
4 . . P P . . . .
3 . . . . P . N .
2 P P . B . P P P
1 R . . Q K B N R
a b c d e f g h
Find ... | Position: Material is level, but Black's king is castled while White's king remains on e1 and White's f1-bishop and g1-knight are undeveloped. White's c4- and d4-pawns are in contact with Black's d5- and c5-pawns, and Black can capture on d4 or c4.
Candidates: Nf3, cxd5, dxc5
- Nf3 cxd4 Nxd4 Nc6: -0.28
Nf3 develops W... | dxc5 | true | 1 | [{"cost": 0.001642675, "seconds": 21.32, "reasoning_tokens": 2236, "flags": [], "critic_cost": 0.00312852, "critic_tool_calls": 7, "false_claims": [{"quote": "Nf3 completes development.", "why": "White's bishop on f1 remains undeveloped after Nf3, so White has not completed development."}, {"quote": "attacks d4", "why"... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.007209 | false | null | null | null |
lichess:qu1sXd4I#ply36 | lichess:qu1sXd4I | games | r6r/p1k4p/2p5/q1p2b2/2P5/2P1Q3/P3PPP1/3RKBN1 w - - 0 19 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g7g6",
"c2c4",
"f8g7",
"b1c3",
"c7c5",
"d4d5",
"f7f5",
"h2h4",
"g7c3",
"b2c3",
"g8f6",
"h4h5",
"d8a5",
"c1d2",
"g6h5",
"d5d6",
"e7d6",
"d1c2",
"f6e4",
"h1h5",
"d6d5",
"h5f5",
"d7d6",
"f5d5",
"e4d2",
"c2d2",
"b8c6",
"d2e3",
"e8d7",
"a1d1",
"d7c7"... | false | white | middlegame | [
{
"move": "Qe5+",
"line": "Qe5+ Kb6 Qxf5 Qxc3+",
"score": "+0.00"
},
{
"move": "g4",
"line": "g4 Bc2 Rc1 Qxa2",
"score": "+0.37"
},
{
"move": "Rd7+",
"line": "Rd7+ Bxd7 Nf3 Rae8",
"score": "-7.30"
},
{
"move": "Nf3",
"line": "Nf3 Rad8 Rc1 Qa3",
"score": "+... | Nf3 | g1f3 | g1f3 | Nf3 | false | {"position":{"side_to_move":"white","move_number":19,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Qe3+ Kd7 Rad1 Kc7 Rxd6 Bf5 Rxc6+ bxc6","opening":"A40 Queen's Pawn Game: Modern Defense","material":{"white":{"queen":1,"rook":1,"bishop":1,"knigh... | {"position": "Material is level: White has a rook, bishop and knight against Black's two rooks and bishop, with two extra pawns for White. White's rook is on the open d-file, but the bishop on f1 and knight on g1 are undeveloped; Black's king on c7 has little shelter and the bishop on f5 is active. Black's queen on a5 ... | Position: Material is level: White has a rook, bishop and knight against Black's two rooks and bishop, with two extra pawns for White. White's rook is on the open d-file, but the bishop on f1 and knight on g1 are undeveloped; Black's king on c7 has little shelter and the bishop on f5 is active. Black's queen on a5 thre... | FEN: r6r/p1k4p/2p5/q1p2b2/2P5/2P1Q3/P3PPP1/3RKBN1 w - - 0 19
Side to move: white
Recent moves: 15. Qe3+ Kd7 16. Rad1 Kc7 17. Rxd6 Bf5 18. Rxc6+ bxc6
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-sco... | Position: Material is level: White has a rook, bishop and knight against Black's two rooks and bishop, with two extra pawns for White. White's rook is on the open d-file, but the bishop on f1 and knight on g1 are undeveloped; Black's king on c7 has little shelter and the bishop on f5 is active. Black's queen on a5 thre... | Nf3 | true | 1 | [{"cost": 0.0016578, "seconds": 21.88, "reasoning_tokens": 2206, "flags": [], "critic_cost": 0.002271225, "critic_tool_calls": 0, "false_claims": [{"quote": "White's last undeveloped minor piece", "why": "The knight on g1 is undeveloped, but so is White's bishop on f1; after Nf3, the bishop remains undeveloped."}, {"qu... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.007266 | false | null | null | null |
lichess:IucluFyc#ply20 | lichess:IucluFyc | games | r2qk2r/ppp1bpp1/1nn1p2p/4P3/3P2b1/2PB1N2/PP4PP/RNB1QRK1 w kq - 0 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"f2f4",
"d7d6",
"e2e4",
"g8f6",
"g1f3",
"c8g4",
"e4e5",
"d6e5",
"f4e5",
"f6d7",
"d2d4",
"e7e6",
"f1d3",
"f8e7",
"e1g1",
"b8c6",
"c2c3",
"d7b6",
"d1e1",
"h7h6"
] | false | white | opening | [
{
"move": "Qg3",
"line": "Qg3 h5 h3 Bxf3",
"score": "+3.13"
},
{
"move": "a4",
"line": "a4 Na5 Qg3 Bxf3",
"score": "+2.32"
},
{
"move": "Bxh6",
"line": "Bxh6 Rxh6 Qg3 Bf5",
"score": "-3.68"
}
] | Qg3 | e1g3 | e1g3 | Qg3 | false | {"position":{"side_to_move":"white","move_number":11,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Bd3 Be7 O-O Nc6 c3 Nb6 Qe1 h6","opening":"B00 Rat Defense: Harmonist","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"paw... | {"position": "Material is level, and White has the e5-d4 center and a castled king, while Black's king remains on e8 and the bishop on g4 attacks White's knight on f3. Black's knight on c6 also attacks d4 and e5, and White still needs to develop the knight on b1 and bishop on c1.", "notes": {"Qg3": "Qg3 attacks the bis... | Position: Material is level, and White has the e5-d4 center and a castled king, while Black's king remains on e8 and the bishop on g4 attacks White's knight on f3. Black's knight on c6 also attacks d4 and e5, and White still needs to develop the knight on b1 and bishop on c1.
Candidates: Qg3, a4, Bxh6
- Qg3 h5 h3 Bxf3:... | FEN: r2qk2r/ppp1bpp1/1nn1p2p/4P3/3P2b1/2PB1N2/PP4PP/RNB1QRK1 w kq - 0 11
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, and White has the e5-d4 center and a castled king, while Black's king remains on e8 and the bishop on g4 attacks White's knight on f3. Black's knight on c6 also attacks d4 and e5, and White still needs to develop the knight on b1 and bishop on c1.
Candidates: Qg3, a4, Bxh6
- Qg3 h5 h3 Bxf3:... | Qg3 | true | 2 | [{"cost": 0.0018448, "seconds": 30.01, "reasoning_tokens": 2669, "flags": ["move not on the shown lines: Nxa1", "move not on the shown lines: Qxf7+"]}, {"cost": 0.000621905, "seconds": 12.83, "reasoning_tokens": 790, "flags": [], "critic_cost": 0.002878225, "critic_tool_calls": 0, "false_claims": [{"quote": "while keep... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.008461 | false | null | null | null |
lichess:NT7EGSC7#ply10 | lichess:NT7EGSC7 | games | rnbqkb1r/1p1p1ppp/p3pn2/8/2PpP3/2N2N2/PP3PPP/R1BQKB1R w KQkq - 0 6 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"a7a6",
"c2c4",
"e7e6",
"b1c3",
"g8f6",
"d2d4",
"c5d4"
] | false | white | opening | [
{
"move": "Na4",
"line": "Na4 Nxe4 a3 Nc6",
"score": "-1.49"
},
{
"move": "Nxd4",
"line": "Nxd4 Qc7 a3 Be7",
"score": "+0.53"
},
{
"move": "Qxd4",
"line": "Qxd4 Nc6 Qe3 Bb4",
"score": "+0.45"
},
{
"move": "e5",
"line": "e5 dxc3 exf6 Bb4",
"score": "-2.14"
... | Nxd4 | f3d4 | f3d4 | Nxd4 | false | {"position":{"side_to_move":"white","move_number":6,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nf3 a6 c4 e6 Nc3 Nf6 d4 cxd4","opening":"B28 Sicilian Defense: O'Kelly Variation, Mar\u00f3czy Bind, Paulsen Line","material... | {"position": "Black is a pawn up, and the pawn on d4 attacks White's knight on c3; White's queen on d1 and knight on f3 both attack it, while Black threatens ...dxc3. White's king on e1 and Black's king on e8 remain uncastled, and Black's knight on f6 also attacks White's pawn on e4.", "notes": {"Na4": "Na4 moves White... | Position: Black is a pawn up, and the pawn on d4 attacks White's knight on c3; White's queen on d1 and knight on f3 both attack it, while Black threatens ...dxc3. White's king on e1 and Black's king on e8 remain uncastled, and Black's knight on f6 also attacks White's pawn on e4.
Candidates: Na4, Nxd4, Qxd4, e5
- Na4 N... | FEN: rnbqkb1r/1p1p1ppp/p3pn2/8/2PpP3/2N2N2/PP3PPP/R1BQKB1R w KQkq - 0 6
Side to move: white
Recent moves: 2. Nf3 a6 3. c4 e6 4. Nc3 Nf6 5. d4 cxd4
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scori... | Position: Black is a pawn up, and the pawn on d4 attacks White's knight on c3; White's queen on d1 and knight on f3 both attack it, while Black threatens ...dxc3. White's king on e1 and Black's king on e8 remain uncastled, and Black's knight on f6 also attacks White's pawn on e4.
Candidates: Na4, Nxd4, Qxd4, e5
- Na4 N... | Nxd4 | true | 0 | [{"cost": 0.0029013, "seconds": 43.19, "reasoning_tokens": 4660, "flags": [], "critic_cost": 0.002010475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004911 | false | null | null | null |
lichess:tPLqlnG4#ply27 | lichess:tPLqlnG4 | games | r1bqk1nr/4bp2/1nppp3/pp5p/3PPPp1/P2B2P1/NPPB3P/2KRQ1NR b kq - 1 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"f2f4",
"d7d6",
"g1f3",
"h7h6",
"d2d4",
"f8e7",
"f1d3",
"g7g5",
"d1e2",
"g5g4",
"f3g1",
"h6h5",
"g2g3",
"a7a6",
"b1c3",
"c7c6",
"c1d2",
"b8d7",
"e1c1",
"b7b5",
"a2a3",
"d7b6",
"c3a2",
"a6a5",
"e2e1"
] | false | black | middlegame | [
{
"move": "b4",
"line": "b4 h3 Nh6 hxg4",
"score": "-0.18"
},
{
"move": "Nd7",
"line": "Nd7 h3 gxh3 Rxh3",
"score": "-1.02"
},
{
"move": "Nc4",
"line": "Nc4 Bxc4 bxc4 h3",
"score": "-0.77"
}
] | b4 | b5b4 | b5b4 | b4 | false | {"position":{"side_to_move":"black","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nd7 O-O-O b5 a3 Nb6 Na2 a5 Qe1","opening":"C00 French Defense: La Bourdonnais Variation","material":{"white":{"queen":1,"rook":2,"bis... | {"position": "Material is level. White's king is castled on c1 and White has a strong d4-e4-f4 centre, while Black's king remains on e8 and Black's g4 and h5 pawns press the kingside; White threatens Bxa5, and Black's c8 bishop and g8 knight are undeveloped.", "notes": {"b4": "b4 blocks White's bishop on d2 from Bxa5; ... | Position: Material is level. White's king is castled on c1 and White has a strong d4-e4-f4 centre, while Black's king remains on e8 and Black's g4 and h5 pawns press the kingside; White threatens Bxa5, and Black's c8 bishop and g8 knight are undeveloped.
Candidates: b4, Nd7, Nc4
- b4 h3 Nh6 hxg4: -0.18
b4 blocks Whit... | FEN: r1bqk1nr/4bp2/1nppp3/pp5p/3PPPp1/P2B2P1/NPPB3P/2KRQ1NR b kq - 1 14
Side to move: black
Board:
8 r . b q k . n r
7 . . . . b p . .
6 . n p p p . . .
5 p p . . . . . p
4 . . . P P P p .
3 P . . B . . P .
2 N P P B . . . P
1 . . K R Q . N R
a b c d e f g h
Find the best move for black. Think first: list candidate m... | Position: Material is level. White's king is castled on c1 and White has a strong d4-e4-f4 centre, while Black's king remains on e8 and Black's g4 and h5 pawns press the kingside; White threatens Bxa5, and Black's c8 bishop and g8 knight are undeveloped.
Candidates: b4, Nd7, Nc4
- b4 h3 Nh6 hxg4: -0.18
b4 blocks Whit... | b4 | true | 0 | [{"cost": 0.002204175, "seconds": 36.25, "reasoning_tokens": 3355, "flags": [], "critic_cost": 0.00293985, "critic_tool_calls": 8, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005144 | false | null | null | null |
lichess:aYq1pydd#ply20 | lichess:aYq1pydd | games | r1bqk2r/p4ppp/1np1p3/3pP3/1bP2B2/8/PP2BPPP/RN1QK2R w KQkq - 2 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"b8c6",
"c2c3",
"g8f6",
"e4e5",
"f6d5",
"d2d4",
"c5d4",
"c3c4",
"d5b6",
"c1f4",
"e7e6",
"f3d4",
"d7d5",
"d4c6",
"b7c6",
"f1e2",
"f8b4"
] | false | white | opening | [
{
"move": "Bd2",
"line": "Bd2 Qe7 a3 Bc5",
"score": "-0.21"
},
{
"move": "Nd2",
"line": "Nd2 Ba6 O-O O-O",
"score": "-0.10"
},
{
"move": "Nc3",
"line": "Nc3 Ba6 cxd5 Bxc3+",
"score": "-0.51"
},
{
"move": "Kf1",
"line": "Kf1 O-O Nd2 Ba6",
"score": "-1.09"
... | Nd2 | b1d2 | b1d2 | Nd2 | false | {"position":{"side_to_move":"white","move_number":11,"phase":"opening","in_check":true,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Bf4 e6 Nxd4 d5 Nxc6 bxc6 Be2 Bb4+","opening":"B30 Sicilian Defense: Old Sicilian","material":{"white":{"queen":1,"rook":2,"b... | {"position": "Material is level, with both kings uncastled and White's e5/c4 pawns facing Black's d5/e6 center; both sides retain their bishop pair. Black's bishop on b4 checks the king on e1, so White must answer before developing.", "notes": {"Bd2": "Bd2 blocks the check and attacks the bishop; ...Qe7 keeps the bisho... | Position: Material is level, with both kings uncastled and White's e5/c4 pawns facing Black's d5/e6 center; both sides retain their bishop pair. Black's bishop on b4 checks the king on e1, so White must answer before developing.
Candidates: Bd2, Nd2, Nc3, Kf1
- Bd2 Qe7 a3 Bc5: -0.21
Bd2 blocks the check and attacks t... | FEN: r1bqk2r/p4ppp/1np1p3/3pP3/1bP2B2/8/PP2BPPP/RN1QK2R w KQkq - 2 11
Side to move: white
Recent moves: 9. Nxc6 bxc6 10. Be2 Bb4+
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. T... | Position: Material is level, with both kings uncastled and White's e5/c4 pawns facing Black's d5/e6 center; both sides retain their bishop pair. Black's bishop on b4 checks the king on e1, so White must answer before developing.
Candidates: Bd2, Nd2, Nc3, Kf1
- Bd2 Qe7 a3 Bc5: -0.21
Bd2 blocks the check and attacks t... | Nd2 | true | 0 | [{"cost": 0.002274925, "seconds": 32.45, "reasoning_tokens": 3486, "flags": [], "critic_cost": 0.003511475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005786 | false | null | null | null |
lichess:hkXAFktD#ply18 | lichess:hkXAFktD | games | r3kb1r/pp1n1ppp/2p1pn2/q6b/2PP4/2NB1P2/PP2N1PP/R1BQ1RK1 w kq - 2 10 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"d7d5",
"e4d5",
"d8d5",
"c2c4",
"d5a5",
"b1c3",
"c7c6",
"d2d4",
"g8f6",
"f1d3",
"c8g4",
"f2f3",
"g4h5",
"g1e2",
"e7e6",
"e1g1",
"b8d7"
] | false | white | opening | [
{
"move": "g4",
"line": "g4 Bg6 g5 Nh5",
"score": "+0.52"
},
{
"move": "Be3",
"line": "Be3 Bg6 g4 Be7",
"score": "+0.33"
},
{
"move": "Bxh7",
"line": "Bxh7 Rxh7 Re1 Bd6",
"score": "-5.71"
},
{
"move": "c5",
"line": "c5 Bg6 a4 Be7",
"score": "+0.34"
}
] | g4 | g2g4 | g2g4 | g4 | false | {"position":{"side_to_move":"white","move_number":10,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Bd3 Bg4 f3 Bh5 Ne2 e6 O-O Nbd7","opening":"B01 Scandinavian Defense: Mieses-Kotroc Variation","material":{"white":{"queen":1,"rook":2,"b... | {"position": "Material is even, with White's c4-d4 pawns facing Black's c6-e6 center. White's king on g1 is castled while Black's king remains on e8; White's bishop on c1 and Black's bishop on f8 are undeveloped. Black's queen on a5 attacks White's knight on c3 and pawn on a2, while Black's bishop on h5 attacks f3.", "... | Position: Material is even, with White's c4-d4 pawns facing Black's c6-e6 center. White's king on g1 is castled while Black's king remains on e8; White's bishop on c1 and Black's bishop on f8 are undeveloped. Black's queen on a5 attacks White's knight on c3 and pawn on a2, while Black's bishop on h5 attacks f3.
Candida... | FEN: r3kb1r/pp1n1ppp/2p1pn2/q6b/2PP4/2NB1P2/PP2N1PP/R1BQ1RK1 w kq - 2 10
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is even, with White's c4-d4 pawns facing Black's c6-e6 center. White's king on g1 is castled while Black's king remains on e8; White's bishop on c1 and Black's bishop on f8 are undeveloped. Black's queen on a5 attacks White's knight on c3 and pawn on a2, while Black's bishop on h5 attacks f3.
Candida... | g4 | true | 0 | [{"cost": 0.001811175, "seconds": 27.23, "reasoning_tokens": 2541, "flags": [], "critic_cost": 0.00396837, "critic_tool_calls": 6, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005779 | false | null | null | null |
lichess:TZk28wxP#ply32 | lichess:TZk28wxP | games | r1b1k1nr/3n3q/1p1p1p1b/pPpPp1pp/N1P1P3/P2Q1PP1/1B2N1BP/R4RK1 w kq - 2 17 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"e7e6",
"c2c4",
"d7d6",
"a2a3",
"c7c6",
"e2e4",
"f7f6",
"g2g3",
"g7g6",
"f1g2",
"b8d7",
"f2f3",
"e6e5",
"d4d5",
"c6c5",
"b2b4",
"b7b6",
"c1b2",
"h7h5",
"g1e2",
"f8h6",
"d1d3",
"d8e7",
"e1g1",
"g6g5",
"b1c3",
"a7a6",
"b4b5",
"a6a5",
"c3a4",
"e7h7"... | false | white | middlegame | [
{
"move": "Nxb6",
"line": "Nxb6 Nxb6 a4 Ne7",
"score": "-3.67"
},
{
"move": "f4",
"line": "f4 Kd8 f5 g4",
"score": "+0.55"
}
] | f4 | f3f4 | f1f2 | Rf2 | true | {"position":{"side_to_move":"white","move_number":17,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"O-O g5 Nbc3 a6 b5 a5 Na4 Qh7","opening":"A40 Horwitz Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":8,... | {"position": "Material is equal, with both sides retaining two bishops and two knights. White's king is safe on g1, while Black's king remains on e8 and the c8-bishop and g8-knight are undeveloped; White's advanced b5- and d5-pawns cramp Black, but Black's queen on h7 attacks e4.", "notes": {"Nxb6": "Nxb6 takes the b6-... | Position: Material is equal, with both sides retaining two bishops and two knights. White's king is safe on g1, while Black's king remains on e8 and the c8-bishop and g8-knight are undeveloped; White's advanced b5- and d5-pawns cramp Black, but Black's queen on h7 attacks e4.
Candidates: Nxb6, f4
- Nxb6 Nxb6 a4 Ne7: -3... | FEN: r1b1k1nr/3n3q/1p1p1p1b/pPpPp1pp/N1P1P3/P2Q1PP1/1B2N1BP/R4RK1 w kq - 2 17
Side to move: white
Recent moves: 13. O-O g5 14. Nbc3 a6 15. b5 a5 16. Na4 Qh7
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the hig... | Position: Material is equal, with both sides retaining two bishops and two knights. White's king is safe on g1, while Black's king remains on e8 and the c8-bishop and g8-knight are undeveloped; White's advanced b5- and d5-pawns cramp Black, but Black's queen on h7 attacks e4.
Candidates: Nxb6, f4
- Nxb6 Nxb6 a4 Ne7: -3... | f4 | true | 0 | [{"cost": 0.001092175, "seconds": 13.49, "reasoning_tokens": 1220, "flags": [], "critic_cost": 0.0013227249999999999, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.002415 | false | null | null | null |
lichess:poG7Q9SI#ply21 | lichess:poG7Q9SI | games | r2qkbnr/p2B1ppp/8/8/3p4/2N5/PP3PPP/R1BQK2R b KQkq - 0 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"e7e6",
"d2d4",
"c5d4",
"f3d4",
"b8c6",
"d4c6",
"b7c6",
"c2c4",
"d7d5",
"e4d5",
"e6d5",
"c4d5",
"c6d5",
"b1c3",
"d5d4",
"f1b5",
"c8d7",
"b5d7"
] | false | black | middlegame | [
{
"move": "Kxd7",
"line": "Kxd7 Qa4+ Ke6 O-O",
"score": "-6.27"
},
{
"move": "Ke7",
"line": "Ke7 Bc6 f5 Bxa8",
"score": "-8.56"
},
{
"move": "Qxd7",
"line": "Qxd7 Qe2+ Be7 Ne4",
"score": "-0.26"
}
] | Qxd7 | d8d7 | d8d7 | Qxd7 | false | {"position":{"side_to_move":"black","move_number":11,"phase":"middlegame","in_check":true,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"exd5 cxd5 cxd5 Nc3 d4 Bb5+ Bd7 Bxd7+","opening":"B44 Sicilian Defense: Taimanov Variation","material":{"white":{"queen":1... | {"position": "White has two bishops to Black's one, with the rest of the material level; Black's passed d4-pawn attacks White's knight on c3. Both kings are uncastled, and White's bishop on d7 checks Black's king on e8.", "notes": {"Kxd7": "Kxd7 takes White's bishop, but White answers Qa4+ and Black replies ...Ke6; aft... | Position: White has two bishops to Black's one, with the rest of the material level; Black's passed d4-pawn attacks White's knight on c3. Both kings are uncastled, and White's bishop on d7 checks Black's king on e8.
Candidates: Kxd7, Ke7, Qxd7
- Kxd7 Qa4+ Ke6 O-O: -6.27
Kxd7 takes White's bishop, but White answers Qa... | FEN: r2qkbnr/p2B1ppp/8/8/3p4/2N5/PP3PPP/R1BQK2R b KQkq - 0 11
Side to move: black
Recent moves: 9... d4 10. Bb5+ Bd7 11. Bxd7+
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then... | Position: White has two bishops to Black's one, with the rest of the material level; Black's passed d4-pawn attacks White's knight on c3. Both kings are uncastled, and White's bishop on d7 checks Black's king on e8.
Candidates: Kxd7, Ke7, Qxd7
- Kxd7 Qa4+ Ke6 O-O: -6.27
Kxd7 takes White's bishop, but White answers Qa... | Qxd7 | true | 0 | [{"cost": 0.003099675, "seconds": 56.58, "reasoning_tokens": 5312, "flags": [], "critic_cost": 0.002957245, "critic_tool_calls": 5, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006057 | false | null | null | null |
lichess:lEfxZefC#ply33 | lichess:lEfxZefC | games | 3r1rk1/ppq1ppbp/2p1N1pn/2n1P3/2N5/2BB3P/PPP1QPP1/R3R1K1 b - - 0 17 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"d7d6",
"d2d4",
"g7g6",
"f1d3",
"f8g7",
"g1f3",
"c7c6",
"e1g1",
"g8f6",
"c1g5",
"d8a5",
"e4e5",
"d6e5",
"d4e5",
"f6g4",
"g5d2",
"a5b6",
"d1e2",
"e8g8",
"d2c3",
"c8e6",
"h2h3",
"g4h6",
"b1d2",
"b8d7",
"f1e1",
"a8d8",
"d2c4",
"b6c7",
"f3g5",
"d7c5"... | false | black | middlegame | [
{
"move": "Qc8",
"line": "Qc8 Nxd8 b6 g4",
"score": "-7.72"
},
{
"move": "Rxd3",
"line": "Rxd3 Nxc7 Rdd8 e6",
"score": "-9.59"
},
{
"move": "Nxe6",
"line": "Nxe6 Qe3 b5 Nd2",
"score": "-0.64"
}
] | Nxe6 | c5e6 | f7e6 | fxe6 | true | {"position":{"side_to_move":"black","move_number":17,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Nd7 Rfe1 Rad8 Nc4 Qc7 Ng5 Nc5 Nxe6","opening":"B00 Pirc Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":7,"points":3... | {"position": "White is a bishop ahead with equal pawns and the bishop pair, while Black's king is castled and the rook on d8 occupies the open d-file. Black's knight on c5 and pawn on f7 both attack White's knight on e6, which in turn attacks Black's queen on c7 and rook on d8.", "notes": {"Qc8": "Qc8 moves Black's que... | Position: White is a bishop ahead with equal pawns and the bishop pair, while Black's king is castled and the rook on d8 occupies the open d-file. Black's knight on c5 and pawn on f7 both attack White's knight on e6, which in turn attacks Black's queen on c7 and rook on d8.
Candidates: Qc8, Rxd3, Nxe6
- Qc8 Nxd8 b6 g4:... | FEN: 3r1rk1/ppq1ppbp/2p1N1pn/2n1P3/2N5/2BB3P/PPP1QPP1/R3R1K1 b - - 0 17
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a bishop ahead with equal pawns and the bishop pair, while Black's king is castled and the rook on d8 occupies the open d-file. Black's knight on c5 and pawn on f7 both attack White's knight on e6, which in turn attacks Black's queen on c7 and rook on d8.
Candidates: Qc8, Rxd3, Nxe6
- Qc8 Nxd8 b6 g4:... | Nxe6 | true | 0 | [{"cost": 0.00388405, "seconds": 70.96, "reasoning_tokens": 6663, "flags": [], "critic_cost": 0.002534225, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006418 | false | null | null | null |
lichess:ism6gbFR#ply22 | lichess:ism6gbFR | games | r4rk1/pp1b1pbp/2np1np1/q1p2PB1/2P1P3/2NB1N2/PP4PP/R2QK2R w KQ - 3 12 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c2c4",
"g7g6",
"b1c3",
"f8g7",
"e2e4",
"e8g8",
"f2f4",
"d7d6",
"g1f3",
"c7c5",
"d4d5",
"e7e6",
"d5e6",
"c8e6",
"f1d3",
"b8c6",
"f4f5",
"e6d7",
"c1g5",
"d8a5"
] | false | white | opening | [
{
"move": "fxg6",
"line": "fxg6 fxg6 O-O Rae8",
"score": "-0.26"
},
{
"move": "O-O",
"line": "O-O Rae8 a4 Nd4",
"score": "+1.42"
},
{
"move": "Qd2",
"line": "Qd2 gxf5 Bh6 Bxh6",
"score": "+1.00"
}
] | O-O | e1g1 | e1g1 | O-O | false | {"position":{"side_to_move":"white","move_number":12,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"dxe6 Bxe6 Bd3 Nc6 f5 Bd7 Bg5 Qa5","opening":"E76 King's Indian Defense: Four Pawns Attack, Dynamic Attack","material":{"white":{"queen":... | {"position": "Material is equal, and White has the bishop pair and an advanced f5-pawn, but White's king is still in the centre while Black's king is castled. Black's queen on a5 attacks the knight on c3 and pawn on a2, while ...gxf5 can capture the f5-pawn.", "notes": {"fxg6": "fxg6 takes the g6-pawn, but ...fxg6 reca... | Position: Material is equal, and White has the bishop pair and an advanced f5-pawn, but White's king is still in the centre while Black's king is castled. Black's queen on a5 attacks the knight on c3 and pawn on a2, while ...gxf5 can capture the f5-pawn.
Candidates: fxg6, O-O, Qd2
- fxg6 fxg6 O-O Rae8: -0.26
fxg6 tak... | FEN: r4rk1/pp1b1pbp/2np1np1/q1p2PB1/2P1P3/2NB1N2/PP4PP/R2QK2R w KQ - 3 12
Side to move: white
Recent moves: 8. dxe6 Bxe6 9. Bd3 Nc6 10. f5 Bd7 11. Bg5 Qa5
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highe... | Position: Material is equal, and White has the bishop pair and an advanced f5-pawn, but White's king is still in the centre while Black's king is castled. Black's queen on a5 attacks the knight on c3 and pawn on a2, while ...gxf5 can capture the f5-pawn.
Candidates: fxg6, O-O, Qd2
- fxg6 fxg6 O-O Rae8: -0.26
fxg6 tak... | O-O | true | 3 | [{"cost": 0.0022578, "seconds": 33.79, "reasoning_tokens": 3449, "flags": ["move not on the shown lines: Nf3", "move not on the shown lines: Bxe4"]}, {"cost": 0.00037536, "seconds": 5.13, "reasoning_tokens": 275, "flags": [], "critic_cost": 0.00324189, "critic_tool_calls": 4, "false_claims": [{"quote": "White gains no ... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010047 | false | null | null | null |
lichess:IRsGQeYt#ply15 | lichess:IRsGQeYt | games | r1bq1rk1/pp1nbppp/2pp1n2/4p3/3PPP2/2PB4/PP1NN1PP/R1BQ1RK1 b - - 0 8 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"d7d6",
"d2d4",
"g8f6",
"f1d3",
"e7e5",
"c2c3",
"f8e7",
"g1e2",
"e8g8",
"e1g1",
"c7c6",
"b1d2",
"b8d7",
"f2f4"
] | false | black | opening | [
{
"move": "exd4",
"line": "exd4 cxd4 b5 Ng3",
"score": "-1.46"
},
{
"move": "b5",
"line": "b5 Nf3 a5 Ng3",
"score": "-0.95"
},
{
"move": "c5",
"line": "c5 fxe5 dxe5 d5",
"score": "-0.51"
}
] | c5 | c6c5 | c6c5 | c5 | false | {"position":{"side_to_move":"black","move_number":8,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Be7 Ne2 O-O O-O c6 Nd2 Nbd7 f4","opening":"B00 Pirc Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":8,"points":39,"bisho... | {"position": "Material is level. White's king is castled, but the f-pawn has advanced to f4, leaving only g2 and h2 as nearby pawn cover; Black's king has a three-pawn shield. White's d4, e4 and f4 pawns challenge Black's e5-d6-c6 center, and Black's knight on f6 attacks e4. White's bishop on c1 and Black's bishop on c... | Position: Material is level. White's king is castled, but the f-pawn has advanced to f4, leaving only g2 and h2 as nearby pawn cover; Black's king has a three-pawn shield. White's d4, e4 and f4 pawns challenge Black's e5-d6-c6 center, and Black's knight on f6 attacks e4. White's bishop on c1 and Black's bishop on c8 re... | FEN: r1bq1rk1/pp1nbppp/2pp1n2/4p3/3PPP2/2PB4/PP1NN1PP/R1BQ1RK1 b - - 0 8
Side to move: black
Recent moves: 4... Be7 5. Ne2 O-O 6. O-O c6 7. Nd2 Nbd7 8. f4
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highe... | Position: Material is level. White's king is castled, but the f-pawn has advanced to f4, leaving only g2 and h2 as nearby pawn cover; Black's king has a three-pawn shield. White's d4, e4 and f4 pawns challenge Black's e5-d6-c6 center, and Black's knight on f6 attacks e4. White's bishop on c1 and Black's bishop on c8 re... | c5 | true | 1 | [{"cost": 0.00162805, "seconds": 26.3, "reasoning_tokens": 2227, "flags": [], "critic_cost": 0.0037317, "critic_tool_calls": 3, "false_claims": [{"quote": "both kings are castled behind intact pawn shields", "why": "White’s f-pawn has advanced to f4, leaving only the g2 and h2 pawns in the immediate king shield; the sh... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.007465 | false | null | null | null |
lichess:EAnGk8l3#ply28 | lichess:EAnGk8l3 | games | rn2k2r/4qppp/p2pp3/8/Pp1NbP2/1B6/1PP3PP/R2QK2R w KQkq - 0 15 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"d7d6",
"d2d4",
"c5d4",
"f3d4",
"g8f6",
"b1c3",
"a7a6",
"c1g5",
"e7e6",
"f2f4",
"f8e7",
"f1c4",
"d8c7",
"c4b3",
"b7b5",
"a2a4",
"b5b4",
"c3e2",
"f6e4",
"g5e7",
"c7e7",
"e2g3",
"c8b7",
"g3e4",
"b7e4"
] | false | white | middlegame | [
{
"move": "Qd2",
"line": "Qd2 O-O f5 exf5",
"score": "-1.64"
},
{
"move": "Nxe6",
"line": "Nxe6 fxe6 O-O d5",
"score": "-4.99"
},
{
"move": "Qe2",
"line": "Qe2 d5 Nf3 Nd7",
"score": "-1.53"
},
{
"move": "O-O",
"line": "O-O g6 Qd2 d5",
"score": "-1.51"
}
... | O-O | e1g1 | e1g1 | O-O | false | {"position":{"side_to_move":"white","move_number":15,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nce2 Nxe4 Bxe7 Qxe7 Ng3 Bb7 Nxe4 Bxe4","opening":"B98 Sicilian Defense: Najdorf Variation","material":{"white":{"queen":... | {"position": "White is a pawn down, with the bishop on b3 and knight on d4 both pressuring e6; Black's bishop on e4 is active and threatens ...Bxg2. Both kings are uncastled, so White needs to secure the king while Black's b4-pawn cramps the queenside.", "notes": {"Qd2": "Qd2 attacks the b4-pawn; ...O-O secures Black's... | Position: White is a pawn down, with the bishop on b3 and knight on d4 both pressuring e6; Black's bishop on e4 is active and threatens ...Bxg2. Both kings are uncastled, so White needs to secure the king while Black's b4-pawn cramps the queenside.
Candidates: Qd2, Nxe6, Qe2, O-O
- Qd2 O-O f5 exf5: -1.64
Qd2 attacks ... | FEN: rn2k2r/4qppp/p2pp3/8/Pp1NbP2/1B6/1PP3PP/R2QK2R w KQkq - 0 15
Side to move: white
Recent moves: 13. Ng3 Bb7 14. Nxe4 Bxe4
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then ... | Position: White is a pawn down, with the bishop on b3 and knight on d4 both pressuring e6; Black's bishop on e4 is active and threatens ...Bxg2. Both kings are uncastled, so White needs to secure the king while Black's b4-pawn cramps the queenside.
Candidates: Qd2, Nxe6, Qe2, O-O
- Qd2 O-O f5 exf5: -1.64
Qd2 attacks ... | O-O | true | 0 | [{"cost": 0.001711675, "seconds": 26.33, "reasoning_tokens": 2365, "flags": [], "critic_cost": 0.004581119999999999, "critic_tool_calls": 2, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006293 | false | null | null | null |
lichess:0uGQsILj#ply34 | lichess:0uGQsILj | games | r4rk1/pp3p2/7p/q1np1Qp1/7P/2P1PN2/P4PP1/R3K2R w KQ - 1 18 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"c2c4",
"g8f6",
"d2d4",
"e7e6",
"b1c3",
"f8b4",
"c1g5",
"h7h6",
"g5h4",
"d7d5",
"c4d5",
"e6d5",
"d1c2",
"g7g5",
"h4g3",
"e8g8",
"e2e3",
"f6e4",
"g1f3",
"c8f5",
"f1d3",
"c7c5",
"d4c5",
"b8d7",
"g3d6",
"e4d6",
"d3f5",
"d6f5",
"c2f5",
"b4c3",
"b2c3",
"d7c5"... | false | white | middlegame | [
{
"move": "hxg5",
"line": "hxg5 Qxc3+ Ke2 Ne4",
"score": "-3.90"
},
{
"move": "Rd1",
"line": "Rd1 Qxc3+ Kf1 g4",
"score": "+1.26"
},
{
"move": "O-O",
"line": "O-O Ne4 hxg5 Qb6",
"score": "+2.53"
},
{
"move": "Rc1",
"line": "Rc1 Qxa2 hxg5 Ne4",
"score": "+1... | O-O | e1g1 | e1g1 | O-O | false | {"position":{"side_to_move":"white","move_number":18,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Bxf5 Nxf5 Qxf5 Bxc3+ bxc3 Nxc5 h4 Qa5","opening":"E30 Nimzo-Indian Defense: Leningrad Variation","material":{"white":{"queen":1,"rook... | {"position": "Material is level, but White's king remains on e1 while Black's king is castled. White's queen eyes d5, g5 and f7; Black's queen attacks a2 and c3, and ...Qxc3+ would take the c3-pawn with check.", "notes": {"hxg5": "hxg5 takes Black's g-pawn, but ...Qxc3+ takes c3 with check; after Ke2, ...Ne4 attacks f2... | Position: Material is level, but White's king remains on e1 while Black's king is castled. White's queen eyes d5, g5 and f7; Black's queen attacks a2 and c3, and ...Qxc3+ would take the c3-pawn with check.
Candidates: hxg5, Rd1, O-O, Rc1
- hxg5 Qxc3+ Ke2 Ne4: -3.90
hxg5 takes Black's g-pawn, but ...Qxc3+ takes c3 wit... | FEN: r4rk1/pp3p2/7p/q1np1Qp1/7P/2P1PN2/P4PP1/R3K2R w KQ - 1 18
Side to move: white
Recent moves: 14. Bxf5 Nxf5 15. Qxf5 Bxc3+ 16. bxc3 Nxc5 17. h4 Qa5
Board:
8 r . . . . r k .
7 p p . . . p . .
6 . . . . . . . p
5 q . n p . Q p .
4 . . . . . . . P
3 . . P . P N . .
2 P . . . . P P .
1 R . . . K . . R
a b c d e f g h
... | Position: Material is level, but White's king remains on e1 while Black's king is castled. White's queen eyes d5, g5 and f7; Black's queen attacks a2 and c3, and ...Qxc3+ would take the c3-pawn with check.
Candidates: hxg5, Rd1, O-O, Rc1
- hxg5 Qxc3+ Ke2 Ne4: -3.90
hxg5 takes Black's g-pawn, but ...Qxc3+ takes c3 wit... | O-O | true | 1 | [{"cost": 0.0023713, "seconds": 35.93, "reasoning_tokens": 3624, "flags": ["move not on the shown lines: Nf3"]}, {"cost": 0.00029094, "seconds": 4.58, "reasoning_tokens": 86, "flags": [], "critic_cost": 0.002720165, "critic_tool_calls": 5, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005382 | false | null | null | null |
lichess:HD5I1sUG#ply15 | lichess:HD5I1sUG | games | r1b1k1nr/pppp1ppp/8/8/3nP2q/2PBB3/P4PPP/R2QK1NR b KQkq - 0 8 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"d2d4",
"e5d4",
"c2c3",
"b8c6",
"c3d4",
"d8h4",
"b1c3",
"f8b4",
"f1d3",
"c6d4",
"c1e3",
"b4c3",
"b2c3"
] | false | black | opening | [
{
"move": "Ne6",
"line": "Ne6 Nf3 Qh5 Be2",
"score": "-0.48"
},
{
"move": "Qxf2+",
"line": "Qxf2+ Bxf2 Nc6 Bg3",
"score": "-9.74"
},
{
"move": "d5",
"line": "d5 Bxd4 dxe4 Bc2",
"score": "-5.71"
}
] | Ne6 | d4e6 | d4c6 | Nc6 | true | {"position":{"side_to_move":"black","move_number":8,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Qh4 Nc3 Bb4 Bd3 Nxd4 Be3 Bxc3+ bxc3","opening":"C21 Danish Gambit","material":{"white":{"queen":1,"rook":2,"bishop":2,"knigh... | {"position": "Black is a pawn up, with two knights and a bishop against White's knight and bishop pair. White's c3-pawn and bishop on e3 both attack the knight on d4, while Black's queen on h4 pressures f2 and e4 with White's king still on e1.", "notes": {"Ne6": "The knight on d4 retreats to e6, escaping both attacks; ... | Position: Black is a pawn up, with two knights and a bishop against White's knight and bishop pair. White's c3-pawn and bishop on e3 both attack the knight on d4, while Black's queen on h4 pressures f2 and e4 with White's king still on e1.
Candidates: Ne6, Qxf2+, d5
- Ne6 Nf3 Qh5 Be2: -0.48
The knight on d4 retreats ... | FEN: r1b1k1nr/pppp1ppp/8/8/3nP2q/2PBB3/P4PPP/R2QK1NR b KQkq - 0 8
Side to move: black
Recent moves: 4... Qh4 5. Nc3 Bb4 6. Bd3 Nxd4 7. Be3 Bxc3+ 8. bxc3
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest... | Position: Black is a pawn up, with two knights and a bishop against White's knight and bishop pair. White's c3-pawn and bishop on e3 both attack the knight on d4, while Black's queen on h4 pressures f2 and e4 with White's king still on e1.
Candidates: Ne6, Qxf2+, d5
- Ne6 Nf3 Qh5 Be2: -0.48
The knight on d4 retreats ... | Ne6 | true | 1 | [{"cost": 0.0018143, "seconds": 30.19, "reasoning_tokens": 2610, "flags": [], "critic_cost": 0.0032147549999999997, "critic_tool_calls": 2, "false_claims": [{"quote": "...Nc6 protects the knight on d4", "why": "The knight on d4 moves to c6, so no knight remains on d4 to be protected."}, {"quote": "The knight from g8 re... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.008418 | false | null | null | null |
lichess:PeYbyHtv#ply17 | lichess:PeYbyHtv | games | rn1qr1k1/ppp2pbp/3p1npB/3Pp3/4P1b1/2N2N2/PPPQ1PPP/2KR1B1R b - - 2 9 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"b1c3",
"g8f6",
"g1f3",
"g7g6",
"d2d4",
"f8g7",
"e2e4",
"d7d6",
"c1e3",
"e8g8",
"d1d2",
"f8e8",
"e1c1",
"e7e5",
"d4d5",
"c8g4",
"e3h6"
] | false | black | opening | [
{
"move": "Bxf3",
"line": "Bxf3 gxf3 Bxh6 Qxh6",
"score": "+0.33"
},
{
"move": "Nbd7",
"line": "Nbd7 Bg5 Nc5 h3",
"score": "+0.02"
},
{
"move": "Bxh6",
"line": "Bxh6 Qxh6 Bxf3 gxf3",
"score": "+0.31"
},
{
"move": "Nxd5",
"line": "Nxd5 Nxd5 c6 Nc3",
"score"... | Bxf3 | g4f3 | g4f3 | Bxf3 | false | {"position":{"side_to_move":"black","move_number":9,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"O-O Qd2 Re8 O-O-O e5 d5 Bg4 Bh6","opening":"B08 Pirc Defense: Classical Variation","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn... | {"position": "Material is level, with both sides having two bishops and two knights; White's king is on c1 and Black's king is on g8. Black's bishop on g4 attacks White's knight on f3, and Black's knight on f6 pressures d5 and e4, while White's bishop on h6 attacks Black's bishop on g7. White's advanced d-pawn is a tar... | Position: Material is level, with both sides having two bishops and two knights; White's king is on c1 and Black's king is on g8. Black's bishop on g4 attacks White's knight on f3, and Black's knight on f6 pressures d5 and e4, while White's bishop on h6 attacks Black's bishop on g7. White's advanced d-pawn is a target,... | FEN: rn1qr1k1/ppp2pbp/3p1npB/3Pp3/4P1b1/2N2N2/PPPQ1PPP/2KR1B1R b - - 2 9
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, with both sides having two bishops and two knights; White's king is on c1 and Black's king is on g8. Black's bishop on g4 attacks White's knight on f3, and Black's knight on f6 pressures d5 and e4, while White's bishop on h6 attacks Black's bishop on g7. White's advanced d-pawn is a target,... | Bxf3 | true | 0 | [{"cost": 0.0026538, "seconds": 38.14, "reasoning_tokens": 4092, "flags": [], "critic_cost": 0.001947725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004602 | false | null | null | null |
lichess:xGqxl5xe#ply27 | lichess:xGqxl5xe | games | r1bqrnkn/1p2b1pp/2pppp2/p6P/2PP1P2/1PNBP1P1/PBQ1N3/R3K2R b KQ - 2 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"c2c4",
"c7c6",
"b1c3",
"d7d6",
"e2e3",
"e7e6",
"d2d4",
"g8e7",
"b2b3",
"e7g6",
"c1b2",
"f8e7",
"d1d2",
"e8g8",
"f1d3",
"a7a5",
"g2g3",
"b8d7",
"h2h4",
"f8e8",
"h4h5",
"g6h8",
"g1e2",
"f7f6",
"f2f4",
"d7f8",
"d2c2"
] | false | black | middlegame | [
{
"move": "f5",
"line": "f5 O-O-O Nf7 d5",
"score": "-1.85"
},
{
"move": "d5",
"line": "d5 h6 g6 O-O-O",
"score": "-1.64"
},
{
"move": "Nf7",
"line": "Nf7 Na4 e5 c5",
"score": "-1.33"
}
] | Nf7 | h8f7 | h8f7 | Nf7 | false | {"position":{"side_to_move":"black","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Re8 h5 Nh8 Nge2 f6 f4 Nf8 Qc2","opening":"A11 English Opening: Caro-Kann Defensive System","material":{"white":{"queen":1,"rook":2,"b... | {"position": "Material is level, with White's centre at c4, d4 and f4 facing Black's c6, d6, e6 and f6 pawns. White's bishop on d3 eyes h7, and h5-h6 would attack g7; White's king is still on e1 while Black's king is castled on g8, and Black's bishop on c8 and knight on f8 remain undeveloped.", "notes": {"f5": "...f5 c... | Position: Material is level, with White's centre at c4, d4 and f4 facing Black's c6, d6, e6 and f6 pawns. White's bishop on d3 eyes h7, and h5-h6 would attack g7; White's king is still on e1 while Black's king is castled on g8, and Black's bishop on c8 and knight on f8 remain undeveloped.
Candidates: f5, d5, Nf7
- f5 O... | FEN: r1bqrnkn/1p2b1pp/2pppp2/p6P/2PP1P2/1PNBP1P1/PBQ1N3/R3K2R b KQ - 2 14
Side to move: black
Legal moves: Bd7, Kf7, Nd7, Nf7, Nfg6, Nhg6, Qb6, Qc7, Qd7, Ra6, Ra7, Rb8, a4, b5, b6, c5, d5, e5, f5, g5, g6, h6
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (... | Position: Material is level, with White's centre at c4, d4 and f4 facing Black's c6, d6, e6 and f6 pawns. White's bishop on d3 eyes h7, and h5-h6 would attack g7; White's king is still on e1 while Black's king is castled on g8, and Black's bishop on c8 and knight on f8 remain undeveloped.
Candidates: f5, d5, Nf7
- f5 O... | Nf7 | true | 1 | [{"cost": 0.00191505, "seconds": 31.44, "reasoning_tokens": 2833, "flags": [], "critic_cost": 0.001687975, "critic_tool_calls": 0, "false_claims": [{"quote": "...Nf7 develops the h8-knight", "why": "The knight on f8 moves to f7; the knight on h8 remains there."}]}, {"cost": 0.000324095, "seconds": 4.39, "reasoning_toke... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005533 | false | null | null | null |
lichess:P9QZtASW#ply19 | lichess:P9QZtASW | games | rnb2rk1/ppq1ppb1/3p1npp/8/3P3P/2P2N2/PP1NBPP1/R1BQ2KR b - - 0 10 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"g1f3",
"c7c5",
"e2e3",
"d7d6",
"f1e2",
"d8c7",
"e1f1",
"g7g6",
"h2h4",
"h7h6",
"b1d2",
"f8g7",
"c2c3",
"e8g8",
"f1g1",
"c5d4",
"e3d4"
] | false | black | opening | [
{
"move": "e5",
"line": "e5 Nf1 Nc6 d5",
"score": "+0.68"
},
{
"move": "Bg4",
"line": "Bg4 Nf1 e5 Ne3",
"score": "+0.46"
},
{
"move": "Nbd7",
"line": "Nbd7 Nf1 e5 Ng3",
"score": "+0.55"
},
{
"move": "Qxc3",
"line": "Qxc3 bxc3 Ne8 Qf1",
"score": "-9.50"
}... | e5 | e7e5 | e7e5 | e5 | false | {"position":{"side_to_move":"black","move_number":10,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"h6 Nbd2 Bg7 c3 O-O Kg1 cxd4 exd4","opening":"A46 Indian Defense: Spielmann-Indian","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"paw... | {"position": "Material is equal, both kings are castled, and both sides have bishop pairs; White's bishop on c1 and Black's knight on b8 and bishop on c8 are still undeveloped. Black's queen attacks White's pawn on c3, while White's pawn on d4 occupies the center and is a target for ...e5.", "notes": {"e5": "...e5 chal... | Position: Material is equal, both kings are castled, and both sides have bishop pairs; White's bishop on c1 and Black's knight on b8 and bishop on c8 are still undeveloped. Black's queen attacks White's pawn on c3, while White's pawn on d4 occupies the center and is a target for ...e5.
Candidates: e5, Bg4, Nbd7, Qxc3
-... | FEN: rnb2rk1/ppq1ppb1/3p1npp/8/3P3P/2P2N2/PP1NBPP1/R1BQ2KR b - - 0 10
Side to move: black
Recent moves: 8... O-O 9. Kg1 cxd4 10. exd4
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Bes... | Position: Material is equal, both kings are castled, and both sides have bishop pairs; White's bishop on c1 and Black's knight on b8 and bishop on c8 are still undeveloped. Black's queen attacks White's pawn on c3, while White's pawn on d4 occupies the center and is a target for ...e5.
Candidates: e5, Bg4, Nbd7, Qxc3
-... | e5 | true | 0 | [{"cost": 0.001426425, "seconds": 20.82, "reasoning_tokens": 1799, "flags": [], "critic_cost": 0.001552725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.002979 | false | null | null | null |
lichess:ZWalgOKb#ply30 | lichess:ZWalgOKb | games | r1br2k1/5ppp/1ppqnn2/p3p3/P3P3/2P2NPP/1P2QPB1/R1B1R1K1 w - - 0 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"g1f3",
"d7d5",
"d2d3",
"b8d7",
"b1d2",
"e7e5",
"g2g3",
"f8d6",
"f1g2",
"g8f6",
"e1g1",
"e8g8",
"d1e2",
"d8c7",
"h2h3",
"a7a5",
"a2a4",
"d7c5",
"f1e1",
"d5e4",
"d3e4",
"c5e6",
"c2c3",
"f8d8",
"d2c4",
"b7b6",
"c4d6",
"c7d6"
] | false | white | middlegame | [
{
"move": "Nxe5",
"line": "Nxe5 Qxe5 f4 Qc7",
"score": "-3.07"
},
{
"move": "Be3",
"line": "Be3 Ba6 Qd1 Qc7",
"score": "-0.07"
},
{
"move": "Bf1",
"line": "Bf1 Ba6 Qc2 Bxf1",
"score": "-0.17"
}
] | Be3 | c1e3 | f3h4 | Nh4 | true | {"position":{"side_to_move":"white","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"dxe4 Ne6 c3 Rd8 Nc4 b6 Nxd6 Qxd6","opening":"B10 Caro-Kann Defense: Endgame Offer","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":1,"... | {"position": "Material is level: White has the bishop pair against Black's bishop and two knights, and both kings are castled behind intact pawn shields. The d-file is open for Black's rook on d8, and Black's knight on f6 attacks White's e4-pawn while White's bishop on c1 remains undeveloped.", "notes": {"Nxe5": "Nxe5 ... | Position: Material is level: White has the bishop pair against Black's bishop and two knights, and both kings are castled behind intact pawn shields. The d-file is open for Black's rook on d8, and Black's knight on f6 attacks White's e4-pawn while White's bishop on c1 remains undeveloped.
Candidates: Nxe5, Be3, Bf1
- N... | FEN: r1br2k1/5ppp/1ppqnn2/p3p3/P3P3/2P2NPP/1P2QPB1/R1B1R1K1 w - - 0 16
Side to move: white
Recent moves: 14. Nc4 b6 15. Nxd6 Qxd6
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. T... | Position: Material is level: White has the bishop pair against Black's bishop and two knights, and both kings are castled behind intact pawn shields. The d-file is open for Black's rook on d8, and Black's knight on f6 attacks White's e4-pawn while White's bishop on c1 remains undeveloped.
Candidates: Nxe5, Be3, Bf1
- N... | Be3 | true | 0 | [{"cost": 0.0018118, "seconds": 27.04, "reasoning_tokens": 2636, "flags": [], "critic_cost": 0.00419693, "critic_tool_calls": 3, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006009 | false | null | null | null |
lichess:t1PHT0aR#ply24 | lichess:t1PHT0aR | games | r1b1k2r/1p2bpp1/pBnpp2p/8/3N1P2/2N5/PPP3PP/R3KR2 w Qkq - 1 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"b8c6",
"d2d4",
"c5d4",
"f3d4",
"g8f6",
"b1c3",
"d7d6",
"c1g5",
"e7e6",
"d1d2",
"a7a6",
"f2f4",
"h7h6",
"g5h4",
"f6e4",
"h4d8",
"e4d2",
"d8b6",
"d2f1",
"h1f1",
"f8e7"
] | false | white | middlegame | [
{
"move": "Nf3",
"line": "Nf3 O-O O-O-O a5",
"score": "-1.63"
},
{
"move": "Nb3",
"line": "Nb3 f6 O-O-O Kf7",
"score": "-1.55"
},
{
"move": "Nxe6",
"line": "Nxe6 fxe6 f5 O-O",
"score": "-6.23"
}
] | Nb3 | d4b3 | d4b3 | Nb3 | false | {"position":{"side_to_move":"white","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Bh4 Nxe4 Bxd8 Nxd2 Bb6 Nxf1 Rxf1 Be7","opening":"B66 Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early D... | {"position": "Black is a pawn ahead and has two bishops against White's bishop and two knights. Both kings are uncastled, though White can still castle long; Black's knight on c6 attacks White's knight on d4, which in turn attacks c6 and e6, while Black's bishop on c8 is undeveloped.", "notes": {"Nf3": "Nf3 withdraws t... | Position: Black is a pawn ahead and has two bishops against White's bishop and two knights. Both kings are uncastled, though White can still castle long; Black's knight on c6 attacks White's knight on d4, which in turn attacks c6 and e6, while Black's bishop on c8 is undeveloped.
Candidates: Nf3, Nb3, Nxe6
- Nf3 O-O O-... | FEN: r1b1k2r/1p2bpp1/pBnpp2p/8/3N1P2/2N5/PPP3PP/R3KR2 w Qkq - 1 13
Side to move: white
Recent moves: 11. Bb6 Nxf1 12. Rxf1 Be7
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then... | Position: Black is a pawn ahead and has two bishops against White's bishop and two knights. Both kings are uncastled, though White can still castle long; Black's knight on c6 attacks White's knight on d4, which in turn attacks c6 and e6, while Black's bishop on c8 is undeveloped.
Candidates: Nf3, Nb3, Nxe6
- Nf3 O-O O-... | Nb3 | true | 0 | [{"cost": 0.002422175, "seconds": 43.37, "reasoning_tokens": 3908, "flags": [], "critic_cost": 0.00274579, "critic_tool_calls": 7, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005168 | false | null | null | null |
lichess:zhcvgVrx#ply56 | lichess:zhcvgVrx | games | 4r3/k6p/1b4n1/p1p2B2/Pn2P3/2N1B3/3K2PP/1R6 w - - 0 29 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"c2c4",
"d5c4",
"e2e4",
"e7e5",
"g1f3",
"e5d4",
"d1d4",
"d8d4",
"f3d4",
"f8c5",
"d4f5",
"b7b5",
"f5g7",
"e8f8",
"g7f5",
"b8c6",
"a2a4",
"c6b4",
"e1d1",
"c7c6",
"b2b3",
"c8e6",
"b3c4",
"b5c4",
"b1c3",
"g8e7",
"c1h6",
"f8e8",
"f5g7",
"e8d7"... | false | white | middlegame | [
{
"move": "Rxb4",
"line": "Rxb4 axb4 Nd5 Ne5",
"score": "-1.41"
},
{
"move": "Rd1",
"line": "Rd1 Nh4 Bh3 c4",
"score": "+3.23"
},
{
"move": "Ke2",
"line": "Ke2 Nh4 Bh3 Ng6",
"score": "+3.37"
}
] | Ke2 | d2e2 | c3b5 | Nb5+ | true | {"position":{"side_to_move":"white","move_number":29,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Bf5 Ra7 Rxa7 Kxa7 Kd2 Bb6 Be3 c5","opening":"D20 Queen's Gambit Accepted: Central Variation, McDonnell Defense","material":{"white":{"rook":1,"bis... | {"position": "White has a rook, two bishops and a knight against Black's rook, bishop and two knights, plus one extra pawn and the bishop pair; Black's rook on e8 eyes White's passed e4 pawn. White's king on d2 is exposed, while Black's king sits on a7; White's rook attacks the knight on b4, but the a5- and c5-pawns ca... | Position: White has a rook, two bishops and a knight against Black's rook, bishop and two knights, plus one extra pawn and the bishop pair; Black's rook on e8 eyes White's passed e4 pawn. White's king on d2 is exposed, while Black's king sits on a7; White's rook attacks the knight on b4, but the a5- and c5-pawns can re... | FEN: 4r3/k6p/1b4n1/p1p2B2/Pn2P3/2N1B3/3K2PP/1R6 w - - 0 29
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White has a rook, two bishops and a knight against Black's rook, bishop and two knights, plus one extra pawn and the bishop pair; Black's rook on e8 eyes White's passed e4 pawn. White's king on d2 is exposed, while Black's king sits on a7; White's rook attacks the knight on b4, but the a5- and c5-pawns can re... | Ke2 | true | 1 | [{"cost": 0.00158705, "seconds": 26.5, "reasoning_tokens": 2232, "flags": [], "critic_cost": 0.0034996899999999997, "critic_tool_calls": 4, "false_claims": [{"quote": "supports e4", "why": "After Ke2, the king on e2 does not attack or defend the pawn on e4; the pawn is defended by the knight on c3 and bishop on f5, and... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.007209 | true | anthropic/claude-sonnet-5.5 | true | [] |
lichess:8pEfoTVL#ply39 | lichess:8pEfoTVL | games | 2kr3r/1ppqbp2/p2p2p1/3PP2p/5P2/2N1Q3/PPP5/2KRR3 b - - 1 20 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"f2f4",
"e5f4",
"g1f3",
"f8e7",
"g2g3",
"f4g3",
"h2g3",
"b8c6",
"d2d4",
"d7d6",
"f1b5",
"c8d7",
"b1c3",
"g8f6",
"c1f4",
"a7a6",
"b5c6",
"d7c6",
"d4d5",
"c6d7",
"d1d3",
"f6h5",
"e1c1",
"h5f4",
"g3f4",
"d7g4",
"d1g1",
"d8d7",
"e4e5",
"g4f3"... | false | black | middlegame | [
{
"move": "dxe5",
"line": "dxe5 d6 cxd6 Qa7",
"score": "-1.70"
},
{
"move": "Kb8",
"line": "Kb8 e6 fxe6 dxe6",
"score": "-0.44"
},
{
"move": "Qf5",
"line": "Qf5 Qa7 Qxf4+ Kb1",
"score": "-0.76"
},
{
"move": "Qg4",
"line": "Qg4 Qa7 Qxf4+ Kb1",
"score": "-0.... | Kb8 | c8b8 | c8b8 | Kb8 | false | {"position":{"side_to_move":"black","move_number":20,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Bxf3 Qxf3 g6 Rd1 O-O-O Rhe1 h5 Qe3","opening":"C35 King's Gambit Accepted: Cunningham Defense","material":{"white":{"queen":1,"rook":2,"knight":1,... | {"position": "Black is a pawn up and has a bishop for White's knight; the kings are on c8 and c1, and Black's h5-pawn is passed. White's d5/e5 pawns press the centre while Black's d6-pawn attacks e5; e6 would hit Qd7 and f7.", "notes": {"dxe5": "...dxe5 takes White's e5-pawn and attacks f4; White pushes d6, then ...cxd... | Position: Black is a pawn up and has a bishop for White's knight; the kings are on c8 and c1, and Black's h5-pawn is passed. White's d5/e5 pawns press the centre while Black's d6-pawn attacks e5; e6 would hit Qd7 and f7.
Candidates: dxe5, Kb8, Qf5, Qg4
- dxe5 d6 cxd6 Qa7: -1.70
...dxe5 takes White's e5-pawn and attac... | FEN: 2kr3r/1ppqbp2/p2p2p1/3PP2p/5P2/2N1Q3/PPP5/2KRR3 b - - 1 20
Side to move: black
Recent moves: 18... O-O-O 19. Rhe1 h5 20. Qe3
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. T... | Position: Black is a pawn up and has a bishop for White's knight; the kings are on c8 and c1, and Black's h5-pawn is passed. White's d5/e5 pawns press the centre while Black's d6-pawn attacks e5; e6 would hit Qd7 and f7.
Candidates: dxe5, Kb8, Qf5, Qg4
- dxe5 d6 cxd6 Qa7: -1.70
...dxe5 takes White's e5-pawn and attac... | Kb8 | true | 3 | [{"cost": 0.003869425, "seconds": 63.86, "reasoning_tokens": 6708, "flags": [], "critic_cost": 0.0033608500000000003, "critic_tool_calls": 3, "false_claims": [{"quote": "...Qxf4+ wins the f-pawn with check, forcing Kb1.", "why": "Kb1 is not forced: White can block the check with Qe3 (or Rd2)."}, {"quote": "...Qxf4+ win... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.020487 | false | null | null | null |
lichess:ycESuj9t#ply9 | lichess:ycESuj9t | games | rnbqkbnr/ppp3pp/8/3P1p2/8/5N2/PP1P1PPP/RNBQKB1R b KQkq - 0 5 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"g1f3",
"d7d5",
"e4d5",
"e6d5",
"c2c4",
"f7f5",
"c4d5"
] | false | black | opening | [
{
"move": "Nf6",
"line": "Nf6 Bc4 Qe7+ Be2",
"score": "-2.04"
},
{
"move": "Qe7+",
"line": "Qe7+ Be2 Qd8 d4",
"score": "-3.23"
},
{
"move": "Bd6",
"line": "Bd6 Bc4 Qe7+ Be2",
"score": "-2.01"
}
] | Bd6 | f8d6 | f8d6 | Bd6 | false | {"position":{"side_to_move":"black","move_number":5,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"e6 Nf3 d5 exd5 exd5 c4 f5 cxd5","opening":"C00 French Defense: Knight Variation","material":{"white":{"queen":1,"rook":2,"bi... | {"position": "White is a pawn ahead, with doubled, isolated pawns on d2 and d5; Black's queen attacks the advanced pawn, and ...Qxd5 is possible. The e-file is open and both kings remain uncastled; White's knight on f3 is the only developed minor piece.", "notes": {"Nf6": "...Nf6 develops a knight and attacks d5; White... | Position: White is a pawn ahead, with doubled, isolated pawns on d2 and d5; Black's queen attacks the advanced pawn, and ...Qxd5 is possible. The e-file is open and both kings remain uncastled; White's knight on f3 is the only developed minor piece.
Candidates: Nf6, Qe7+, Bd6
- Nf6 Bc4 Qe7+ Be2: -2.04
...Nf6 develops... | FEN: rnbqkbnr/ppp3pp/8/3P1p2/8/5N2/PP1P1PPP/RNBQKB1R b KQkq - 0 5
Side to move: black
Recent moves: 3... exd5 4. c4 f5 5. cxd5
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then... | Position: White is a pawn ahead, with doubled, isolated pawns on d2 and d5; Black's queen attacks the advanced pawn, and ...Qxd5 is possible. The e-file is open and both kings remain uncastled; White's knight on f3 is the only developed minor piece.
Candidates: Nf6, Qe7+, Bd6
- Nf6 Bc4 Qe7+ Be2: -2.04
...Nf6 develops... | Bd6 | true | 1 | [{"cost": 0.00263255, "seconds": 41.2, "reasoning_tokens": 4296, "flags": [], "critic_cost": 0.0039742150000000006, "critic_tool_calls": 9, "false_claims": [{"quote": "forces Be2", "why": "After ...Qe7+, White can also legally answer Kf1, so Be2 is not forced."}, {"quote": "Black later completes development", "why": "I... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010164 | false | null | null | null |
lichess:kzb9igKX#ply21 | lichess:kzb9igKX | games | r2q1rk1/pp2bppp/4pn2/2ppP3/3P2b1/2PBP3/PP1N2PP/R1B1QRK1 b - - 0 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"e2e3",
"c7c6",
"f2f4",
"g8f6",
"g1f3",
"c8g4",
"f1d3",
"e7e6",
"e1g1",
"f8e7",
"d1e1",
"e8g8",
"b1d2",
"b8d7",
"c2c3",
"c6c5",
"f3e5",
"d7e5",
"f4e5"
] | false | black | opening | [
{
"move": "Ne8",
"line": "Ne8 Qg3 Bf5 Bxf5",
"score": "-0.60"
},
{
"move": "Nd7",
"line": "Nd7 Qg3 Bh5 Qh3",
"score": "-0.11"
},
{
"move": "cxd4",
"line": "cxd4 exf6 Bxf6 exd4",
"score": "-6.23"
}
] | Nd7 | f6d7 | f6h5 | Nh5 | true | {"position":{"side_to_move":"black","move_number":11,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"O-O Nbd2 Nbd7 c3 c5 Ne5 Nxe5 fxe5","opening":"D00 Queen's Pawn Game","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":1,"pawn":8,"points":... | {"position": "Material is level and both kings are castled. White's e5-pawn and rook on f1 attack Black's knight on f6, which is defended by the bishop on e7 and pawn on g7; Black's c5-pawn attacks d4, and White's bishop on d3 eyes h7.", "notes": {"Ne8": "Ne8 moves the knight off the f-file and away from White's e5-paw... | Position: Material is level and both kings are castled. White's e5-pawn and rook on f1 attack Black's knight on f6, which is defended by the bishop on e7 and pawn on g7; Black's c5-pawn attacks d4, and White's bishop on d3 eyes h7.
Candidates: Ne8, Nd7, cxd4
- Ne8 Qg3 Bf5 Bxf5: -0.60
Ne8 moves the knight off the f-fi... | FEN: r2q1rk1/pp2bppp/4pn2/2ppP3/3P2b1/2PBP3/PP1N2PP/R1B1QRK1 b - - 0 11
Side to move: black
Recent moves: 7... O-O 8. Nbd2 Nbd7 9. c3 c5 10. Ne5 Nxe5 11. fxe5
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the h... | Position: Material is level and both kings are castled. White's e5-pawn and rook on f1 attack Black's knight on f6, which is defended by the bishop on e7 and pawn on g7; Black's c5-pawn attacks d4, and White's bishop on d3 eyes h7.
Candidates: Ne8, Nd7, cxd4
- Ne8 Qg3 Bf5 Bxf5: -0.60
Ne8 moves the knight off the f-fi... | Nd7 | true | 0 | [{"cost": 0.0021733, "seconds": 36.38, "reasoning_tokens": 3304, "flags": [], "critic_cost": 0.0035588850000000003, "critic_tool_calls": 5, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005732 | false | null | null | null |
lichess:ljAVkEHd#ply29 | lichess:ljAVkEHd | games | 2kr3r/pp1n1pb1/1qp1p2p/3P2p1/3P4/1N1Q1NP1/PPP2PP1/1K1R3R b - - 0 15 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c1g5",
"f6e4",
"g5h4",
"g7g5",
"h4g3",
"f8g7",
"g1f3",
"h7h6",
"b1d2",
"e4g3",
"h2g3",
"d7d5",
"e2e3",
"c8f5",
"d2b3",
"b8d7",
"f1d3",
"f5d3",
"d1d3",
"e7e6",
"e1c1",
"c7c6",
"c1b1",
"d8b6",
"e3e4",
"e8c8",
"e4d5"
] | false | black | middlegame | [
{
"move": "cxd5",
"line": "cxd5 Rhe1 Kb8 Qe3",
"score": "+0.02"
},
{
"move": "exd5",
"line": "exd5 Qf5 Qb4 Rhe1",
"score": "-1.44"
},
{
"move": "Bxd4",
"line": "Bxd4 Qxd4 Qxd4 Rxd4",
"score": "-6.32"
}
] | cxd5 | c6d5 | c6d5 | cxd5 | false | {"position":{"side_to_move":"black","move_number":15,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"e6 O-O-O c6 Kb1 Qb6 e4 O-O-O exd5","opening":"A45 Trompowsky Attack: Edge Variation","material":{"white":{"queen":1,"rook":2,"knight":2,"pawn":8,"... | {"position": "White is a pawn up, but White's advanced d5-pawn is attacked by both Black's c6- and e6-pawns. The kings on b1 and c8 are not under immediate attack, while Black's queen on b6 and bishop on g7 both attack White's d4-pawn.", "notes": {"cxd5": "cxd5 removes White's advanced pawn while keeping Black's e6-paw... | Position: White is a pawn up, but White's advanced d5-pawn is attacked by both Black's c6- and e6-pawns. The kings on b1 and c8 are not under immediate attack, while Black's queen on b6 and bishop on g7 both attack White's d4-pawn.
Candidates: cxd5, exd5, Bxd4
- cxd5 Rhe1 Kb8 Qe3: +0.02
cxd5 removes White's advanced ... | FEN: 2kr3r/pp1n1pb1/1qp1p2p/3P2p1/3P4/1N1Q1NP1/PPP2PP1/1K1R3R b - - 0 15
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a pawn up, but White's advanced d5-pawn is attacked by both Black's c6- and e6-pawns. The kings on b1 and c8 are not under immediate attack, while Black's queen on b6 and bishop on g7 both attack White's d4-pawn.
Candidates: cxd5, exd5, Bxd4
- cxd5 Rhe1 Kb8 Qe3: +0.02
cxd5 removes White's advanced ... | cxd5 | true | 1 | [{"cost": 0.002764175, "seconds": 43.86, "reasoning_tokens": 4474, "flags": ["move not on the shown lines: Nb3"]}, {"cost": 0.000381145, "seconds": 5.66, "reasoning_tokens": 341, "flags": [], "critic_cost": 0.002657765, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005803 | false | null | null | null |
lichess:5iVmREGn#ply5 | lichess:5iVmREGn | games | rnb1kbnr/ppqppppp/2p5/8/3PPP2/8/PPP3PP/RNBQKBNR b KQkq - 0 3 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"f2f4",
"d8c7",
"d2d4"
] | false | black | opening | [
{
"move": "Qxf4",
"line": "Qxf4 Bxf4 d6 d5",
"score": "-9.95"
},
{
"move": "d5",
"line": "d5 e5 Bf5 Bd3",
"score": "-0.33"
},
{
"move": "h5",
"line": "h5 Nc3 d5 exd5",
"score": "-0.67"
}
] | d5 | d7d5 | d7d5 | d5 | false | {"position":{"side_to_move":"black","move_number":3,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"e4 c6 f4 Qc7 d4","opening":"B10 Caro-Kann Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":8,"p... | {"position": "Material is equal. White's d4-e4-f4 pawns form a broad centre, while both kings remain uncastled and the minor pieces undeveloped; Black's queen on c7 targets f4 and can give ...Qa5+.", "notes": {"Qxf4": "After ...Qxf4 takes White's f4-pawn, White replies Bxf4 and wins Black's queen; ...d6 and d5 leave Bl... | Position: Material is equal. White's d4-e4-f4 pawns form a broad centre, while both kings remain uncastled and the minor pieces undeveloped; Black's queen on c7 targets f4 and can give ...Qa5+.
Candidates: Qxf4, d5, h5
- Qxf4 Bxf4 d6 d5: -9.95
After ...Qxf4 takes White's f4-pawn, White replies Bxf4 and wins Black's q... | FEN: rnb1kbnr/ppqppppp/2p5/8/3PPP2/8/PPP3PP/RNBQKBNR b KQkq - 0 3
Side to move: black
Recent moves: 1. e4 c6 2. f4 Qc7 3. d4
Board:
8 r n b . k b n r
7 p p q p p p p p
6 . . p . . . . .
5 . . . . . . . .
4 . . . P P P . .
3 . . . . . . . .
2 P P P . . . P P
1 R N B Q K B N R
a b c d e f g h
Find the best move for bla... | Position: Material is equal. White's d4-e4-f4 pawns form a broad centre, while both kings remain uncastled and the minor pieces undeveloped; Black's queen on c7 targets f4 and can give ...Qa5+.
Candidates: Qxf4, d5, h5
- Qxf4 Bxf4 d6 d5: -9.95
After ...Qxf4 takes White's f4-pawn, White replies Bxf4 and wins Black's q... | d5 | true | 0 | [{"cost": 0.001855175, "seconds": 28.96, "reasoning_tokens": 2750, "flags": [], "critic_cost": 0.001633725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003489 | false | null | null | null |
lichess:0CB5qPyS#ply25 | lichess:0CB5qPyS | games | r1bq1rk1/p1p3pp/1p1p1n2/3Ppp2/2P1n3/P3P2P/1BPNBPP1/R2Q1RK1 b - - 1 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"f7f5",
"h2h3",
"e7e6",
"d4d5",
"e6e5",
"b1c3",
"g8f6",
"e2e3",
"f8b4",
"g1f3",
"d7d6",
"f1e2",
"e8g8",
"e1g1",
"b8d7",
"a2a3",
"b4c3",
"b2c3",
"f6e4",
"c1b2",
"d7f6",
"c3c4",
"b7b6",
"f3d2"
] | false | black | middlegame | [
{
"move": "Nxd5",
"line": "Nxd5 Nxe4 Bb7 cxd5",
"score": "-6.36"
},
{
"move": "Bd7",
"line": "Bd7 f4 Nxd2 Qxd2",
"score": "+0.54"
},
{
"move": "Nc5",
"line": "Nc5 a4 a5 f4",
"score": "+0.81"
}
] | Nc5 | e4c5 | e4c5 | Nc5 | false | {"position":{"side_to_move":"black","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Bxc3 bxc3 Ne4 Bb2 Ndf6 c4 b6 Nd2","opening":"A80 Dutch Defense: Korchnoi Attack","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":1,"pa... | {"position": "Material is level: White has two bishops and a knight, while Black has a bishop and two knights. Black's knights are active on e4 and f6: the e4-knight attacks White's d2-knight and f2-pawn, while the f6-knight attacks d5. Both kings are castled, Black's c8-bishop is undeveloped, and White can challenge e... | Position: Material is level: White has two bishops and a knight, while Black has a bishop and two knights. Black's knights are active on e4 and f6: the e4-knight attacks White's d2-knight and f2-pawn, while the f6-knight attacks d5. Both kings are castled, Black's c8-bishop is undeveloped, and White can challenge e5 wi... | FEN: r1bq1rk1/p1p3pp/1p1p1n2/3Ppp2/2P1n3/P3P2P/1BPNBPP1/R2Q1RK1 b - - 1 13
Side to move: black
Recent moves: 9... Bxc3 10. bxc3 Ne4 11. Bb2 Ndf6 12. c4 b6 13. Nd2
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick t... | Position: Material is level: White has two bishops and a knight, while Black has a bishop and two knights. Black's knights are active on e4 and f6: the e4-knight attacks White's d2-knight and f2-pawn, while the f6-knight attacks d5. Both kings are castled, Black's c8-bishop is undeveloped, and White can challenge e5 wi... | Nc5 | true | 0 | [{"cost": 0.002516675, "seconds": 37.58, "reasoning_tokens": 3945, "flags": [], "critic_cost": 0.0021032250000000002, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00462 | false | null | null | null |
lichess:DHWASoIe#ply7 | lichess:DHWASoIe | games | rnbqkbnr/pp3ppp/2ppp3/8/2P5/2N1PN2/PP1P1PPP/R1BQKB1R b KQkq - 0 4 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"c2c4",
"d7d6",
"b1c3",
"e7e6",
"g1f3",
"c7c6",
"e2e3"
] | false | black | opening | [
{
"move": "Nd7",
"line": "Nd7 d4 e5 Be2",
"score": "-0.76"
},
{
"move": "Be7",
"line": "Be7 d4 Nf6 e4",
"score": "-0.73"
},
{
"move": "g6",
"line": "g6 d4 Bg7 e4",
"score": "-0.80"
},
{
"move": "Nf6",
"line": "Nf6 d4 Be7 e4",
"score": "-0.72"
}
] | Nf6 | g8f6 | g8f6 | Nf6 | false | {"position":{"side_to_move":"black","move_number":4,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"c4 d6 Nc3 e6 Nf3 c6 e3","opening":"A10 English Opening","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn"... | {"position": "Material is level; White has developed both knights, while Black still has all four minor pieces at home. Both kings remain safe on their starting squares, and White can expand with d4, so Black needs to develop and contest the centre.", "notes": {"Nd7": "Nd7 develops the b8-knight and supports ...e5; Whi... | Position: Material is level; White has developed both knights, while Black still has all four minor pieces at home. Both kings remain safe on their starting squares, and White can expand with d4, so Black needs to develop and contest the centre.
Candidates: Nd7, Be7, g6, Nf6
- Nd7 d4 e5 Be2: -0.76
Nd7 develops the b8... | FEN: rnbqkbnr/pp3ppp/2ppp3/8/2P5/2N1PN2/PP1P1PPP/R1BQKB1R b KQkq - 0 4
Side to move: black
Recent moves: 2... e6 3. Nf3 c6 4. e3
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Th... | Position: Material is level; White has developed both knights, while Black still has all four minor pieces at home. Both kings remain safe on their starting squares, and White can expand with d4, so Black needs to develop and contest the centre.
Candidates: Nd7, Be7, g6, Nf6
- Nd7 d4 e5 Be2: -0.76
Nd7 develops the b8... | Nf6 | true | 0 | [{"cost": 0.003775675, "seconds": 60.24, "reasoning_tokens": 6510, "flags": [], "critic_cost": 0.001603475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005379 | false | null | null | null |
lichess:h84Yyw5j#ply26 | lichess:h84Yyw5j | games | r1bq1rk1/3nbpp1/n1p1p2p/3pP3/3P1P2/2NBB3/PPQ3PP/2KR2NR w - - 2 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c2c4",
"d7d6",
"b1c3",
"e7e6",
"e2e4",
"f8e7",
"c1e3",
"e8g8",
"d1b3",
"h7h6",
"e1c1",
"a7a6",
"e4e5",
"f6d7",
"f2f4",
"b7b5",
"c4b5",
"a6b5",
"f1b5",
"c7c6",
"b5d3",
"d6d5",
"b3c2",
"b8a6"
] | false | white | middlegame | [
{
"move": "a3",
"line": "a3 Rb8 Nf3 Qa5",
"score": "-0.39"
},
{
"move": "Nxd5",
"line": "Nxd5 cxd5 a3 Nb6",
"score": "-6.44"
},
{
"move": "Qf2",
"line": "Qf2 Qa5 f5 exf5",
"score": "-0.72"
}
] | a3 | a2a3 | a2a3 | a3 | false | {"position":{"side_to_move":"white","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"cxb5 axb5 Bxb5 c6 Bd3 d5 Qc2 Na6","opening":"A53 Old Indian Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":7,"point... | {"position": "White is a pawn ahead, and both sides have the bishop pair; White has space with the supported pawn on e5, while Black's c6-pawn is backward. White's king is on c1 and the knight on g1 is undeveloped; Black can pressure b2 with ...Rb8 or target a2 and the knight on c3 with ...Qa5.", "notes": {"a3": "a3 co... | Position: White is a pawn ahead, and both sides have the bishop pair; White has space with the supported pawn on e5, while Black's c6-pawn is backward. White's king is on c1 and the knight on g1 is undeveloped; Black can pressure b2 with ...Rb8 or target a2 and the knight on c3 with ...Qa5.
Candidates: a3, Nxd5, Qf2
- ... | FEN: r1bq1rk1/3nbpp1/n1p1p2p/3pP3/3P1P2/2NBB3/PPQ3PP/2KR2NR w - - 2 14
Side to move: white
Recent moves: 10. cxb5 axb5 11. Bxb5 c6 12. Bd3 d5 13. Qc2 Na6
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highes... | Position: White is a pawn ahead, and both sides have the bishop pair; White has space with the supported pawn on e5, while Black's c6-pawn is backward. White's king is on c1 and the knight on g1 is undeveloped; Black can pressure b2 with ...Rb8 or target a2 and the knight on c3 with ...Qa5.
Candidates: a3, Nxd5, Qf2
- ... | a3 | true | 1 | [{"cost": 0.002018425, "seconds": 31.35, "reasoning_tokens": 3010, "flags": ["move not on the shown lines: Nc3", "move not on the shown lines: Nc3"]}, {"cost": 0.000373225, "seconds": 5.37, "reasoning_tokens": 309, "flags": [], "critic_cost": 0.00241578, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004808 | false | null | null | null |
lichess:eD0mUxDp#ply13 | lichess:eD0mUxDp | games | rn1qkbnr/pp3pp1/2p1p3/3pP1Bp/3P3P/3Q4/PPP2PP1/RN2K1NR b KQkq - 1 7 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"d2d4",
"d7d5",
"e4e5",
"c8f5",
"h2h4",
"h7h5",
"f1d3",
"f5d3",
"d1d3",
"e7e6",
"c1g5"
] | false | black | opening | [
{
"move": "Qb6",
"line": "Qb6 Nd2 c5 Ne2",
"score": "-0.25"
},
{
"move": "Qa5+",
"line": "Qa5+ Nd2 c5 Nf3",
"score": "-0.55"
},
{
"move": "Qxg5",
"line": "Qxg5 hxg5 Ne7 a3",
"score": "-9.48"
},
{
"move": "Be7",
"line": "Be7 Nf3 Bxg5 Nxg5",
"score": "-0.34"... | Qb6 | d8b6 | d8b6 | Qb6 | false | {"position":{"side_to_move":"black","move_number":7,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Bf5 h4 h5 Bd3 Bxd3 Qxd3 e6 Bg5","opening":"B12 Caro-Kann Defense: Advance Variation, Tal Variation","material":{"white":{"qu... | {"position": "Material is even. White's bishop on g5 attacks Black's queen on d8, so White threatens Bxd8; both kings remain uncastled, and White's e5 and d4 pawns face Black's d5 and e6 center.", "notes": {"Qb6": "Qb6 escapes the bishop attack and targets b2 and d4; Nd2 develops, then ...c5 pressures d4 and Ne2 follow... | Position: Material is even. White's bishop on g5 attacks Black's queen on d8, so White threatens Bxd8; both kings remain uncastled, and White's e5 and d4 pawns face Black's d5 and e6 center.
Candidates: Qb6, Qa5+, Qxg5, Be7
- Qb6 Nd2 c5 Ne2: -0.25
Qb6 escapes the bishop attack and targets b2 and d4; Nd2 develops, the... | FEN: rn1qkbnr/pp3pp1/2p1p3/3pP1Bp/3P3P/3Q4/PPP2PP1/RN2K1NR b KQkq - 1 7
Side to move: black
Recent moves: 3... Bf5 4. h4 h5 5. Bd3 Bxd3 6. Qxd3 e6 7. Bg5
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highes... | Position: Material is even. White's bishop on g5 attacks Black's queen on d8, so White threatens Bxd8; both kings remain uncastled, and White's e5 and d4 pawns face Black's d5 and e6 center.
Candidates: Qb6, Qa5+, Qxg5, Be7
- Qb6 Nd2 c5 Ne2: -0.25
Qb6 escapes the bishop attack and targets b2 and d4; Nd2 develops, the... | Qb6 | true | 1 | [{"cost": 0.001460175, "seconds": 19.26, "reasoning_tokens": 1854, "flags": [], "critic_cost": 0.0031434749999999997, "critic_tool_calls": 0, "false_claims": [{"quote": "then develops the queenside pieces", "why": "In the supplied Qb6 continuation, after ...c5 Black plays ...Bc5, moving the bishop from f8; the queensid... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006516 | false | null | null | null |
lichess:48aXmxna#ply34 | lichess:48aXmxna | games | 2kr3r/ppp1q3/6p1/1PP1np1p/4b3/P1N1P2P/1BQ1BKP1/R6R w - - 1 18 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"g1f3",
"b8c6",
"d2d4",
"e7e5",
"d4e5",
"d7d6",
"e5d6",
"f8d6",
"e2e3",
"g8f6",
"f1e2",
"d8e7",
"c2c4",
"c8d7",
"d1c2",
"f6g4",
"h2h3",
"g4f2",
"e1f2",
"e8c8",
"b1c3",
"h7h5",
"a2a3",
"g7g6",
"b2b4",
"f7f5",
"c4c5",
"d6e5",
"f3e5",
"c6e5",
"c1b2",
"d7c6"... | false | white | middlegame | [
{
"move": "Qc1",
"line": "Qc1 Rhf8 Rd1 Rxd1",
"score": "+2.14"
},
{
"move": "Qxe4",
"line": "Qxe4 fxe4 Nxe4 Rhf8+",
"score": "-7.01"
},
{
"move": "Nxe4",
"line": "Nxe4 fxe4 Qxe4 Rhf8+",
"score": "+5.22"
}
] | Nxe4 | c3e4 | c3e4 | Nxe4 | false | {"position":{"side_to_move":"white","move_number":18,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"c5 Be5 Nxe5 Nxe5 Bb2 Bc6 b5 Be4","opening":"A04 Zukertort Opening: Black Mustang Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knig... | {"position": "White has an extra bishop, with queens, rooks, knights, and pawns otherwise equal. White's king on f2 is exposed, while Black's king on c8 has cover. Black's bishop on e4 attacks White's queen on c2 and pawn on g2, and Black's queen on e7 attacks the c5-pawn; Black's rook on d8 controls the open d-file.",... | Position: White has an extra bishop, with queens, rooks, knights, and pawns otherwise equal. White's king on f2 is exposed, while Black's king on c8 has cover. Black's bishop on e4 attacks White's queen on c2 and pawn on g2, and Black's queen on e7 attacks the c5-pawn; Black's rook on d8 controls the open d-file.
Candi... | FEN: 2kr3r/ppp1q3/6p1/1PP1np1p/4b3/P1N1P2P/1BQ1BKP1/R6R w - - 1 18
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White has an extra bishop, with queens, rooks, knights, and pawns otherwise equal. White's king on f2 is exposed, while Black's king on c8 has cover. Black's bishop on e4 attacks White's queen on c2 and pawn on g2, and Black's queen on e7 attacks the c5-pawn; Black's rook on d8 controls the open d-file.
Candi... | Nxe4 | true | 0 | [{"cost": 0.001586675, "seconds": 22.89, "reasoning_tokens": 2099, "flags": [], "critic_cost": 0.001637725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003225 | false | null | null | null |
lichess:MOKeeEiY#ply38 | lichess:MOKeeEiY | games | r4r2/ppp1p1kp/1n1q2p1/5b2/8/1Q5P/PP2NPP1/2R1KB1R w K - 0 20 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"g1f3",
"g7g6",
"c2c4",
"f8g7",
"b1c3",
"d7d5",
"c4d5",
"f6d5",
"c1d2",
"e8g8",
"e2e4",
"d5b6",
"d2e3",
"b8c6",
"h2h3",
"f7f5",
"e4e5",
"f5f4",
"e3c1",
"c8f5",
"d1b3",
"g8h8",
"c1f4",
"c6d4",
"f3d4",
"d8d4",
"c3e2",
"d4c5",
"a1c1",
"c5a5"... | false | white | middlegame | [
{
"move": "Ng3",
"line": "Ng3 Be6 Qc3+ Kg8",
"score": "-2.21"
},
{
"move": "Qxb6",
"line": "Qxb6 Qxb6 Rc4 Qxb2",
"score": "-10.27"
},
{
"move": "Rd1",
"line": "Rd1 Qe5 Qc3 Qxc3+",
"score": "-2.26"
}
] | Ng3 | e2g3 | b3c3 | Qc3+ | true | {"position":{"side_to_move":"white","move_number":20,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Rc1 Qa5+ Bd2 Qxe5 Bc3 Qd6 Bxg7+ Kxg7","opening":"D90 Gr\u00fcnfeld Defense: Three Knights Variation","material":{"white":{"queen":1,"rook":2,... | {"position": "White is a pawn down, and both kings are uncastled; White's king on e1 has little pawn cover, while Black's king on g7 also has a thin shield. White's queen on b3 eyes the black knight on b6, White's rook on c1 presses the c-file, and Black's bishop on f5 attacks White's pawn on h3.", "notes": {"Ng3": "Ng... | Position: White is a pawn down, and both kings are uncastled; White's king on e1 has little pawn cover, while Black's king on g7 also has a thin shield. White's queen on b3 eyes the black knight on b6, White's rook on c1 presses the c-file, and Black's bishop on f5 attacks White's pawn on h3.
Candidates: Ng3, Qxb6, Rd1... | FEN: r4r2/ppp1p1kp/1n1q2p1/5b2/8/1Q5P/PP2NPP1/2R1KB1R w K - 0 20
Side to move: white
Recent moves: 16. Rc1 Qa5+ 17. Bd2 Qxe5 18. Bc3 Qd6 19. Bxg7+ Kxg7
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-... | Position: White is a pawn down, and both kings are uncastled; White's king on e1 has little pawn cover, while Black's king on g7 also has a thin shield. White's queen on b3 eyes the black knight on b6, White's rook on c1 presses the c-file, and Black's bishop on f5 attacks White's pawn on h3.
Candidates: Ng3, Qxb6, Rd1... | Ng3 | true | 2 | [{"cost": 0.00228805, "seconds": 34.01, "reasoning_tokens": 3540, "flags": [], "critic_cost": 0.003104175, "critic_tool_calls": 2, "false_claims": [{"quote": "Best: Ng3 (-2.21)", "why": "Qc3+ is evaluated at -2.08, which is better for White than Ng3 at -2.21."}]}, {"cost": 0.000809595, "seconds": 13.63, "reasoning_toke... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.013372 | false | null | null | null |
lichess:aSr1WONj#ply11 | lichess:aSr1WONj | games | rn1qkbnr/pp2pppp/2p5/8/3PN3/5Q2/PPP2PPP/R1B1KB1R b KQkq - 0 6 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"b1c3",
"d7d5",
"g1f3",
"c8g4",
"d2d4",
"d5e4",
"c3e4",
"g4f3",
"d1f3"
] | false | black | opening | [
{
"move": "Qa5+",
"line": "Qa5+ Bd2 Qd5 c4",
"score": "-3.11"
},
{
"move": "Qxd4",
"line": "Qxd4 Be3 Qxb2 Bc4",
"score": "-1.08"
},
{
"move": "e6",
"line": "e6 Bf4 Qd5",
"score": "-0.84"
}
] | e6 | e7e6 | b8d7 | Nd7 | true | {"position":{"side_to_move":"black","move_number":6,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"d5 Nf3 Bg4 d4 dxe4 Nxe4 Bxf3 Qxf3","opening":"B11 Caro-Kann Defense: Two Knights Attack, Mindeno Variation","material":{"whi... | {"position": "Material is level, with White's bishop pair against Black's bishop and two knights. White's queen on f3 eyes f7, while Black's queen on d8 attacks the loose pawn on d4; both kings remain uncastled, and Black can take d4 immediately.", "notes": {"Qa5+": "Qa5+ checks White's king and attacks a2; White answe... | Position: Material is level, with White's bishop pair against Black's bishop and two knights. White's queen on f3 eyes f7, while Black's queen on d8 attacks the loose pawn on d4; both kings remain uncastled, and Black can take d4 immediately.
Candidates: Qa5+, Qxd4, e6
- Qa5+ Bd2 Qd5 c4: -3.11
Qa5+ checks White's kin... | FEN: rn1qkbnr/pp2pppp/2p5/8/3PN3/5Q2/PPP2PPP/R1B1KB1R b KQkq - 0 6
Side to move: black
Recent moves: 4... dxe4 5. Nxe4 Bxf3 6. Qxf3
Board:
8 r n . q k b n r
7 p p . . p p p p
6 . . p . . . . .
5 . . . . . . . .
4 . . . P N . . .
3 . . . . . Q . .
2 P P P . . P P P
1 R . B . K B . R
a b c d e f g h
Find the best move ... | Position: Material is level, with White's bishop pair against Black's bishop and two knights. White's queen on f3 eyes f7, while Black's queen on d8 attacks the loose pawn on d4; both kings remain uncastled, and Black can take d4 immediately.
Candidates: Qa5+, Qxd4, e6
- Qa5+ Bd2 Qd5 c4: -3.11
Qa5+ checks White's kin... | e6 | true | 1 | [{"cost": 0.002028925, "seconds": 33.52, "reasoning_tokens": 3106, "flags": ["move not on the shown lines: Ra1"]}, {"cost": 0.000248335, "seconds": 3.24, "reasoning_tokens": 115, "flags": [], "critic_cost": 0.00337551, "critic_tool_calls": 3, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005653 | false | null | null | null |
lichess:rsKo0LI3#ply8 | lichess:rsKo0LI3 | games | rnbqkb1r/pp2pppp/5n2/2pp4/3P1B2/4PN2/PPP2PPP/RN1QKB1R w KQkq - 0 5 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"g1f3",
"c7c6",
"c1f4",
"g8f6",
"e2e3",
"c6c5"
] | false | white | opening | [
{
"move": "Bb5+",
"line": "Bb5+ Bd7 Be2 Nc6",
"score": "+0.27"
},
{
"move": "dxc5",
"line": "dxc5 Qa5+ Nbd2 Qxc5",
"score": "+1.15"
},
{
"move": "Nc3",
"line": "Nc3 Qa5 dxc5 Bd7",
"score": "+0.75"
}
] | dxc5 | d4c5 | d4c5 | dxc5 | false | {"position":{"side_to_move":"white","move_number":5,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"d4 d5 Nf3 c6 Bf4 Nf6 e3 c5","opening":"D02 Queen's Pawn Game: Zukertort Variation","material":{"white":{"queen":1,"rook":2,"... | {"position": "Material is equal, with White's bishop on f4 aimed at Black's knight on b8 and both sides' kings still uncastled. Black's c5-pawn attacks White's d4-pawn, while White's d4-pawn attacks c5; White has a slight lead in development.", "notes": {"Bb5+": "Bb5+ checks along the c6–d7 diagonal; ...Bd7 blocks and ... | Position: Material is equal, with White's bishop on f4 aimed at Black's knight on b8 and both sides' kings still uncastled. Black's c5-pawn attacks White's d4-pawn, while White's d4-pawn attacks c5; White has a slight lead in development.
Candidates: Bb5+, dxc5, Nc3
- Bb5+ Bd7 Be2 Nc6: +0.27
Bb5+ checks along the c6–... | FEN: rnbqkb1r/pp2pppp/5n2/2pp4/3P1B2/4PN2/PPP2PPP/RN1QKB1R w KQkq - 0 5
Side to move: white
Board:
8 r n b q k b . r
7 p p . . p p p p
6 . . . . . n . .
5 . . p p . . . .
4 . . . P . B . .
3 . . . . P N . .
2 P P P . . P P P
1 R N . Q K B . R
a b c d e f g h
Find the best move for white. Think first: list candidate m... | Position: Material is equal, with White's bishop on f4 aimed at Black's knight on b8 and both sides' kings still uncastled. Black's c5-pawn attacks White's d4-pawn, while White's d4-pawn attacks c5; White has a slight lead in development.
Candidates: Bb5+, dxc5, Nc3
- Bb5+ Bd7 Be2 Nc6: +0.27
Bb5+ checks along the c6–... | dxc5 | true | 2 | [{"cost": 0.002581925, "seconds": 40.67, "reasoning_tokens": 4142, "flags": ["move not on the shown lines: cxd5", "move not on the shown lines: Nxd5", "no knight on d5"]}, {"cost": 0.000642455, "seconds": 10.73, "reasoning_tokens": 858, "flags": [], "critic_cost": 0.0031733000000000004, "critic_tool_calls": 2, "false_c... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.008946 | false | null | null | null |
lichess:BeNoI4xb#ply37 | lichess:BeNoI4xb | games | r3r2k/2p2p1p/p1p2p2/2Ppb3/N2Pp3/1P2P1Nq/P4P2/3RQRK1 b - d3 0 19 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"b2b3",
"e7e5",
"c1b2",
"b8c6",
"e2e3",
"d7d5",
"g1e2",
"f8d6",
"e2g3",
"g8f6",
"f1b5",
"e8g8",
"b1c3",
"f8e8",
"e1g1",
"a7a6",
"b5c6",
"b7c6",
"c3a4",
"c8g4",
"d1e1",
"d8d7",
"h2h3",
"g4e6",
"a1c1",
"e5e4",
"c2c4",
"e6h3",
"g2h3",
"d7h3",
"b2f6",
"g7f6"... | false | black | middlegame | [
{
"move": "Re6",
"line": "Re6 b4",
"score": "+5.28"
},
{
"move": "Bxg3",
"line": "Bxg3 fxg3 Rg8 Qe2",
"score": "+8.95"
},
{
"move": "Qxf1+",
"line": "Qxf1+ Qxf1 Bxg3 fxg3",
"score": "-7.81"
},
{
"move": "Rg8",
"line": "Rg8 dxe5 Rg6 Rd2",
"score": "+5.54"
... | Bxg3 | e5g3 | e5g3 | Bxg3 | false | {"position":{"side_to_move":"black","move_number":19,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":"d3","recent_moves":"Qxh3 Bxf6 gxf6 c5 Be5 Rd1 Kh8 d4","opening":"A01 Nimzo-Larsen Attack: Modern Variation","material":{"white":{"queen":1,"rook":2,"knight":2,"pawn":... | {"position": "White has two knights and six pawns against Black's bishop and eight pawns, with queens and two rooks each; White is slightly ahead in material. White's king on g1 has a thin pawn shield, and Black's queen on h3 attacks the rook on f1 and knight on g3. White's d4-pawn attacks Black's bishop on e5 and thre... | Position: White has two knights and six pawns against Black's bishop and eight pawns, with queens and two rooks each; White is slightly ahead in material. White's king on g1 has a thin pawn shield, and Black's queen on h3 attacks the rook on f1 and knight on g3. White's d4-pawn attacks Black's bishop on e5 and threaten... | FEN: r3r2k/2p2p1p/p1p2p2/2Ppb3/N2Pp3/1P2P1Nq/P4P2/3RQRK1 b - d3 0 19
Side to move: black
Recent moves: 17... Be5 18. Rd1 Kh8 19. d4
Board:
8 r . . . r . . k
7 . . p . . p . p
6 p . p . . p . .
5 . . P p b . . .
4 N . . P p . . .
3 . P . . P . N q
2 P . . . . P . .
1 . . . R Q R K .
a b c d e f g h
Find the best move ... | Position: White has two knights and six pawns against Black's bishop and eight pawns, with queens and two rooks each; White is slightly ahead in material. White's king on g1 has a thin pawn shield, and Black's queen on h3 attacks the rook on f1 and knight on g3. White's d4-pawn attacks Black's bishop on e5 and threaten... | Bxg3 | true | 1 | [{"cost": 0.0033768, "seconds": 49.9, "reasoning_tokens": 5607, "flags": [], "critic_cost": 0.00622238, "critic_tool_calls": 2, "false_claims": [{"quote": "draw fxg3 and open the g-file", "why": "The g-file is already open in the position, and fxg3 puts a White pawn on g3, blocking it. Black's rook clears that pawn onl... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.012394 | false | null | null | null |
lichess:dSd1Efws#ply8 | lichess:dSd1Efws | games | r2qkb1r/ppp1pppp/2n2n2/3p1b2/2P5/1P2PN2/P2P1PPP/RNBQKB1R w KQkq - 1 5 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"g1f3",
"g8f6",
"b2b3",
"d7d5",
"e2e3",
"c8f5",
"c2c4",
"b8c6"
] | false | white | opening | [
{
"move": "cxd5",
"line": "cxd5 Nb4 Nd4 Nd3+",
"score": "-0.39"
},
{
"move": "Nh4",
"line": "Nh4 Bg4 Be2 Bxe2",
"score": "-0.31"
},
{
"move": "Bb2",
"line": "Bb2 Nb4 Na3 c6",
"score": "-0.37"
}
] | Nh4 | f3h4 | a2a3 | a3 | true | {"position":{"side_to_move":"white","move_number":5,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nf3 Nf6 b3 d5 e3 Bf5 c4 Nc6","opening":"A05 Zukertort Opening: Nimzo-Larsen Variation","material":{"white":{"queen":1,"rook"... | {"position": "Material is level, and both kings remain uncastled. White has a c4-versus-d5 pawn tension and three undeveloped minor pieces; Black's bishop on f5 bears down on the knight on b1, while ...Nb4 can pressure a2 and d5 after an exchange.", "notes": {"cxd5": "cxd5 takes Black's d5-pawn and places a pawn on d5,... | Position: Material is level, and both kings remain uncastled. White has a c4-versus-d5 pawn tension and three undeveloped minor pieces; Black's bishop on f5 bears down on the knight on b1, while ...Nb4 can pressure a2 and d5 after an exchange.
Candidates: cxd5, Nh4, Bb2
- cxd5 Nb4 Nd4 Nd3+: -0.39
cxd5 takes Black's d... | FEN: r2qkb1r/ppp1pppp/2n2n2/3p1b2/2P5/1P2PN2/P2P1PPP/RNBQKB1R w KQkq - 1 5
Side to move: white
Recent moves: 1. Nf3 Nf6 2. b3 d5 3. e3 Bf5 4. c4 Nc6
Legal moves: Ba3, Bb2, Bd3, Be2, Ke2, Na3, Nc3, Nd4, Ne5, Ng1, Ng5, Nh4, Qc2, Qe2, Rg1, a3, a4, b4, c5, cxd5, d3, d4, e4, g3, g4, h3, h4
Find the best move for white. Thin... | Position: Material is level, and both kings remain uncastled. White has a c4-versus-d5 pawn tension and three undeveloped minor pieces; Black's bishop on f5 bears down on the knight on b1, while ...Nb4 can pressure a2 and d5 after an exchange.
Candidates: cxd5, Nh4, Bb2
- cxd5 Nb4 Nd4 Nd3+: -0.39
cxd5 takes Black's d... | Nh4 | true | 0 | [{"cost": 0.00183705, "seconds": 26.95, "reasoning_tokens": 2644, "flags": [], "critic_cost": 0.002791225, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004628 | false | null | null | null |
lichess:89Via7Xb#ply11 | lichess:89Via7Xb | games | rnbqkb1r/1p3ppp/p1p1pn2/2Pp4/3P1B2/2N2N2/PP2PPPP/R2QKB1R b KQkq - 1 6 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"c2c4",
"c7c6",
"b1c3",
"g8f6",
"g1f3",
"a7a6",
"c4c5",
"e7e6",
"c1f4"
] | false | black | opening | [
{
"move": "Bxc5",
"line": "Bxc5 dxc5 O-O e3",
"score": "-5.66"
},
{
"move": "a5",
"line": "a5 Na4 Nbd7 e3",
"score": "-0.72"
},
{
"move": "b6",
"line": "b6 b4 a5 a3",
"score": "-0.66"
}
] | b6 | b7b6 | b8d7 | Nbd7 | true | {"position":{"side_to_move":"black","move_number":6,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"c6 Nc3 Nf6 Nf3 a6 c5 e6 Bf4","opening":"D15 Slav Defense: Chebanenko Variation, Advance System","material":{"white":{"queen"... | {"position": "Material is level, and both kings remain uncastled. White has a space-gaining pawn on c5 backed by d4, while the bishop on f4 attacks Black's knight on b8 and White's knight on c3 pressures d5; Black's b8 knight and both bishops are undeveloped.", "notes": {"Bxc5": "Black takes White's c5 pawn with ...Bxc... | Position: Material is level, and both kings remain uncastled. White has a space-gaining pawn on c5 backed by d4, while the bishop on f4 attacks Black's knight on b8 and White's knight on c3 pressures d5; Black's b8 knight and both bishops are undeveloped.
Candidates: Bxc5, a5, b6
- Bxc5 dxc5 O-O e3: -5.66
Black takes... | FEN: rnbqkb1r/1p3ppp/p1p1pn2/2Pp4/3P1B2/2N2N2/PP2PPPP/R2QKB1R b KQkq - 1 6
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, and both kings remain uncastled. White has a space-gaining pawn on c5 backed by d4, while the bishop on f4 attacks Black's knight on b8 and White's knight on c3 pressures d5; Black's b8 knight and both bishops are undeveloped.
Candidates: Bxc5, a5, b6
- Bxc5 dxc5 O-O e3: -5.66
Black takes... | b6 | true | 0 | [{"cost": 0.001529175, "seconds": 20.21, "reasoning_tokens": 2064, "flags": [], "critic_cost": 0.001806475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003335 | false | null | null | null |
lichess:HOSwZEGc#ply37 | lichess:HOSwZEGc | games | r3k2r/1p1b1ppp/p3p3/n1b1P1B1/P1BN1n2/8/4QPPP/R1R3K1 b kq - 0 19 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"d2d4",
"d7d5",
"e4e5",
"c7c5",
"c2c3",
"d8b6",
"g1f3",
"b8c6",
"f1d3",
"c8d7",
"e1g1",
"c5d4",
"c3c4",
"d5c4",
"d3c4",
"g8e7",
"a2a4",
"e7g6",
"d1e2",
"a7a6",
"c1g5",
"c6a5",
"b1d2",
"b6b2",
"a1b1",
"b2a3",
"f3d4",
"f8c5",
"b1a1",
"a3c3"... | false | black | middlegame | [
{
"move": "Nxc4",
"line": "Nxc4 Qxc4 Bxd4 Bxf4",
"score": "-6.95"
},
{
"move": "Bxd4",
"line": "Bxd4 Bxf4 Bxa1 Rxa1",
"score": "-6.16"
},
{
"move": "Nxe2+",
"line": "Nxe2+ Nxe2 O-O Ba2",
"score": "+2.80"
},
{
"move": "Bxa4",
"line": "Bxa4 Bxf4 Nxc4 Rxc4",
... | Nxe2+ | f4e2 | f4e2 | Nxe2+ | false | {"position":{"side_to_move":"black","move_number":19,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Bc5 Ra1 Qc3 Rfc1 Qxd4 Nf3 Nf4 Nxd4","opening":"C02 French Defense: Advance Variation, Milner-Barry Gambit","material":{"white":{"quee... | {"position": "White has a queen against Black's extra knight and pawn, while rooks and bishops are level. Black's knight on f4 attacks White's queen on e2 and pawn on g2, but White's bishop on g5 attacks that knight; Black's bishop on c5 attacks White's knight on d4, and the knight on a5 attacks White's bishop on c4. W... | Position: White has a queen against Black's extra knight and pawn, while rooks and bishops are level. Black's knight on f4 attacks White's queen on e2 and pawn on g2, but White's bishop on g5 attacks that knight; Black's bishop on c5 attacks White's knight on d4, and the knight on a5 attacks White's bishop on c4. White... | FEN: r3k2r/1p1b1ppp/p3p3/n1b1P1B1/P1BN1n2/8/4QPPP/R1R3K1 b kq - 0 19
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White has a queen against Black's extra knight and pawn, while rooks and bishops are level. Black's knight on f4 attacks White's queen on e2 and pawn on g2, but White's bishop on g5 attacks that knight; Black's bishop on c5 attacks White's knight on d4, and the knight on a5 attacks White's bishop on c4. White... | Nxe2+ | true | 2 | [{"cost": 0.002097675, "seconds": 29.52, "reasoning_tokens": 3034, "flags": ["move not on the shown lines: Bc4"]}, {"cost": 0.000520065, "seconds": 7.45, "reasoning_tokens": 538, "flags": [], "critic_cost": 0.0037982249999999997, "critic_tool_calls": 4, "false_claims": [{"quote": "Black is up a knight and a pawn, with ... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.009101 | false | null | null | null |
lichess:YM5GNmCP#ply25 | lichess:YM5GNmCP | games | r2qk1nr/5ppp/p3p3/2bpP3/8/2N2Q1P/PP3PP1/R1B2RK1 b kq - 1 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"d2d4",
"d7d5",
"e4e5",
"c6c5",
"c2c3",
"c5d4",
"c3d4",
"b8c6",
"g1f3",
"c8g4",
"f1b5",
"a7a6",
"b5c6",
"b7c6",
"h2h3",
"g4f3",
"d1f3",
"e7e6",
"e1g1",
"c6c5",
"d4c5",
"f8c5",
"b1c3"
] | false | black | middlegame | [
{
"move": "Ne7",
"line": "Ne7 Be3 Bxe3 Qxe3",
"score": "+0.35"
},
{
"move": "Bxf2+",
"line": "Bxf2+ Qxf2 f5 Be3",
"score": "-6.91"
},
{
"move": "Qc7",
"line": "Qc7 Na4 Bd4 Be3",
"score": "-0.08"
},
{
"move": "Rc8",
"line": "Rc8 Na4 Ne7 Nxc5",
"score": "-0.... | Ne7 | g8e7 | g8e7 | Ne7 | false | {"position":{"side_to_move":"black","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Bxf3 Qxf3 e6 O-O c5 dxc5 Bxc5 Nc3","opening":"B12 Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense","material":{"white":... | {"position": "Material is level; White's king is castled, while Black's king remains in the centre. Black's bishop on c5 eyes f2 with ...Bxf2+ available, and White's queen and knight both attack d5; White's bishop on c1 and Black's knight on g8 are still undeveloped.", "notes": {"Ne7": "Ne7 develops Black's knight from... | Position: Material is level; White's king is castled, while Black's king remains in the centre. Black's bishop on c5 eyes f2 with ...Bxf2+ available, and White's queen and knight both attack d5; White's bishop on c1 and Black's knight on g8 are still undeveloped.
Candidates: Ne7, Bxf2+, Qc7, Rc8
- Ne7 Be3 Bxe3 Qxe3: +0... | FEN: r2qk1nr/5ppp/p3p3/2bpP3/8/2N2Q1P/PP3PP1/R1B2RK1 b kq - 1 13
Side to move: black
Recent moves: 11... c5 12. dxc5 Bxc5 13. Nc3
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. T... | Position: Material is level; White's king is castled, while Black's king remains in the centre. Black's bishop on c5 eyes f2 with ...Bxf2+ available, and White's queen and knight both attack d5; White's bishop on c1 and Black's knight on g8 are still undeveloped.
Candidates: Ne7, Bxf2+, Qc7, Rc8
- Ne7 Be3 Bxe3 Qxe3: +0... | Ne7 | true | 0 | [{"cost": 0.0025678, "seconds": 39.79, "reasoning_tokens": 4111, "flags": [], "critic_cost": 0.0022439749999999996, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004812 | false | null | null | null |
lichess:P52SIgzM#ply30 | lichess:P52SIgzM | games | r1k2r2/2p3p1/b1p2pn1/4p2p/4P3/2N2NP1/PPP2P1P/2KR3R w - - 0 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"e7e5",
"d4e5",
"d7d6",
"e2e4",
"b8c6",
"f1b5",
"d6e5",
"d1d8",
"e8d8",
"b5c6",
"b7c6",
"c1g5",
"f7f6",
"g5e3",
"c8a6",
"b1c3",
"g8e7",
"e1c1",
"d8c8",
"g1f3",
"a8b8",
"e3a7",
"b8a8",
"a7c5",
"e7g6",
"c5f8",
"h8f8",
"g2g3",
"h7h5"
] | false | white | middlegame | [
{
"move": "b3",
"line": "b3 Rd8 Rhg1 Nf8",
"score": "+2.68"
},
{
"move": "Rd8+",
"line": "Rd8+ Rxd8 b3 Nf8",
"score": "-6.83"
}
] | b3 | b2b3 | f3d2 | Nd2 | true | {"position":{"side_to_move":"white","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Bxa7 Ra8 Bc5 Ng6 Bxf8 Rxf8 g3 h5","opening":"B00 Nimzowitsch Defense: Kennedy Variation, de Smet Gambit","material":{"white":{"rook":2,"knight":2,... | {"position": "White is a pawn ahead, with two knights against Black's bishop and knight; Black's c-pawns are doubled and isolated. The d-file is open, so Black can challenge White's rook on d1 with ...Rd8, while both kings remain on the c-file.", "notes": {"b3": "b3 controls c4 and keeps White's extra pawn; Black repli... | Position: White is a pawn ahead, with two knights against Black's bishop and knight; Black's c-pawns are doubled and isolated. The d-file is open, so Black can challenge White's rook on d1 with ...Rd8, while both kings remain on the c-file.
Candidates: b3, Rd8+
- b3 Rd8 Rhg1 Nf8: +2.68
b3 controls c4 and keeps White'... | FEN: r1k2r2/2p3p1/b1p2pn1/4p2p/4P3/2N2NP1/PPP2P1P/2KR3R w - - 0 16
Side to move: white
Recent moves: 14. Bxf8 Rxf8 15. g3 h5
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then a... | Position: White is a pawn ahead, with two knights against Black's bishop and knight; Black's c-pawns are doubled and isolated. The d-file is open, so Black can challenge White's rook on d1 with ...Rd8, while both kings remain on the c-file.
Candidates: b3, Rd8+
- b3 Rd8 Rhg1 Nf8: +2.68
b3 controls c4 and keeps White'... | b3 | true | 0 | [{"cost": 0.001665675, "seconds": 26.04, "reasoning_tokens": 2488, "flags": [], "critic_cost": 0.0019461499999999998, "critic_tool_calls": 4, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003612 | false | null | null | null |
lichess:cr1Yr3ED#ply34 | lichess:cr1Yr3ED | games | 1r2r1k1/p2qppb1/3p1npp/2p5/4P2B/2N5/PPP1QPPP/1R1R2K1 w - - 4 18 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"b8c6",
"f1b5",
"d7d6",
"d2d4",
"c5d4",
"f3d4",
"c8d7",
"b5c6",
"b7c6",
"e1g1",
"g8f6",
"b1c3",
"g7g6",
"c1g5",
"f8g7",
"d1d2",
"e8g8",
"d4f3",
"d7g4",
"f3d4",
"c6c5",
"d4e2",
"g4e2",
"d2e2",
"a8b8",
"a1b1",
"h7h6",
"g5h4",
"d8d7"... | false | white | middlegame | [
{
"move": "Rxd6",
"line": "Rxd6 exd6 Bxf6 Bxf6",
"score": "-7.14"
},
{
"move": "f3",
"line": "f3 Nh5 Qd2 g5",
"score": "-0.13"
}
] | f3 | f2f3 | b2b3 | b3 | true | {"position":{"side_to_move":"white","move_number":18,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Qxe2 Rb8 Rab1 h6 Bh4 Qd7 Rfd1 Rfe8","opening":"B30 Sicilian Defense: Nyezhmetdinov-Rossolimo Attack","material":{"white":{"queen":1,"rook":2,"bish... | {"position": "Material is level, and both kings are castled with their pawn shields intact. White's rook on d1 pressures the pawn on d6, while Black's rook on b8 targets b2 and Black's knight on f6 attacks e4; White's bishop on h4 attacks that knight.", "notes": {"Rxd6": "Rxd6 takes the d6-pawn and attacks Black's quee... | Position: Material is level, and both kings are castled with their pawn shields intact. White's rook on d1 pressures the pawn on d6, while Black's rook on b8 targets b2 and Black's knight on f6 attacks e4; White's bishop on h4 attacks that knight.
Candidates: Rxd6, f3
- Rxd6 exd6 Bxf6 Bxf6: -7.14
Rxd6 takes the d6-pa... | FEN: 1r2r1k1/p2qppb1/3p1npp/2p5/4P2B/2N5/PPP1QPPP/1R1R2K1 w - - 4 18
Side to move: white
Recent moves: 16. Bh4 Qd7 17. Rfd1 Rfe8
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Th... | Position: Material is level, and both kings are castled with their pawn shields intact. White's rook on d1 pressures the pawn on d6, while Black's rook on b8 targets b2 and Black's knight on f6 attacks e4; White's bishop on h4 attacks that knight.
Candidates: Rxd6, f3
- Rxd6 exd6 Bxf6 Bxf6: -7.14
Rxd6 takes the d6-pa... | f3 | true | 1 | [{"cost": 0.000939925, "seconds": 12.54, "reasoning_tokens": 989, "flags": [], "critic_cost": 0.002728725, "critic_tool_calls": 0, "false_claims": [{"quote": "trading bishops for knights", "why": "In the line, White's bishop takes Black's knight on f6, then Black's bishop takes White's bishop and survives. White trades... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005281 | true | anthropic/claude-sonnet-5.5 | true | [] |
lichess:KFwYOhoS#ply26 | lichess:KFwYOhoS | games | r3kb1r/pp1bp3/n2p4/q1p3Q1/2Pp4/P1N5/1P1B1PPP/R3KB1R w KQkq - 0 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"c7c5",
"d4d5",
"d7d6",
"c2c4",
"b8a6",
"b1c3",
"c8d7",
"a2a3",
"d8a5",
"c1d2",
"g8f6",
"g1f3",
"h7h6",
"e2e4",
"g7g5",
"e4e5",
"f6g4",
"e5e6",
"f7e6",
"f3g5",
"h6g5",
"d1g4",
"e6d5",
"g4g5",
"d5d4"
] | false | white | middlegame | [
{
"move": "Nd5",
"line": "Nd5 Qa4 Qg6+ Kd8",
"score": "+1.12"
},
{
"move": "Qh5+",
"line": "Qh5+ Rxh5 O-O-O dxc3",
"score": "-9.40"
}
] | Nd5 | c3d5 | g5g6 | Qg6+ | true | {"position":{"side_to_move":"white","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"e6 fxe6 Nxg5 hxg5 Qxg4 exd5 Qxg5 d4","opening":"A43 Benoni Defense: Old Benoni","material":{"white":{"queen":1,"rook":2,... | {"position": "Material is equal, but neither king has castled and Black's advanced d4-pawn attacks White's knight on c3; ...dxc3 is the immediate threat. White's queen on g5 pressures e7 and c5, while Black's queen on a5 also hits a3 and c3.", "notes": {"Nd5": "Nd5 gets the knight out of ...dxc3 and attacks e7; Black r... | Position: Material is equal, but neither king has castled and Black's advanced d4-pawn attacks White's knight on c3; ...dxc3 is the immediate threat. White's queen on g5 pressures e7 and c5, while Black's queen on a5 also hits a3 and c3.
Candidates: Nd5, Qh5+
- Nd5 Qa4 Qg6+ Kd8: +1.12
Nd5 gets the knight out of ...dx... | FEN: r3kb1r/pp1bp3/n2p4/q1p3Q1/2Pp4/P1N5/1P1B1PPP/R3KB1R w KQkq - 0 14
Side to move: white
Recent moves: 12. Qxg4 exd5 13. Qxg5 d4
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. ... | Position: Material is equal, but neither king has castled and Black's advanced d4-pawn attacks White's knight on c3; ...dxc3 is the immediate threat. White's queen on g5 pressures e7 and c5, while Black's queen on a5 also hits a3 and c3.
Candidates: Nd5, Qh5+
- Nd5 Qa4 Qg6+ Kd8: +1.12
Nd5 gets the knight out of ...dx... | Nd5 | true | 0 | [{"cost": 0.00140555, "seconds": 27.96, "reasoning_tokens": 1867, "flags": [], "critic_cost": 0.001553725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00296 | false | null | null | null |
lichess:5MXF8YHV#ply18 | lichess:5MXF8YHV | games | 1r1q1rk1/ppp1bpp1/2n1pn1p/1BPp1b2/Q2P1B2/4PN2/PP3PPP/RN2K2R w KQ - 0 10 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"c1f4",
"c8f5",
"e2e3",
"b8c6",
"g1f3",
"g8f6",
"c2c4",
"e7e6",
"d1b3",
"a8b8",
"c4c5",
"f8e7",
"f1b5",
"e8g8",
"b3a4",
"h7h6"
] | false | white | opening | [
{
"move": "Bxh6",
"line": "Bxh6 gxh6 Bxc6 bxc6",
"score": "-4.57"
},
{
"move": "Nc3",
"line": "Nc3 Ne4 Nxe4 Bxe4",
"score": "+0.64"
},
{
"move": "h3",
"line": "h3 Ne4 O-O Bf6",
"score": "+0.67"
}
] | h3 | h2h3 | b5c6 | Bxc6 | true | {"position":{"side_to_move":"white","move_number":10,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Qb3 Rb8 c5 Be7 Bb5 O-O Qa4 h6","opening":"D00 Queen's Pawn Game: Accelerated London System","material":{"white":{"queen":1,"rook":2,"bis... | {"position": "Material is equal, and both sides have the bishop pair; Black's king is castled while White's remains in the centre, with White's b1-knight still undeveloped. Black's knight on c6 attacks d4, while White's bishop on b5 attacks it; ...Ne4 can hit c5 and f2.", "notes": {"Bxh6": "Bxh6 takes the h-pawn, but .... | Position: Material is equal, and both sides have the bishop pair; Black's king is castled while White's remains in the centre, with White's b1-knight still undeveloped. Black's knight on c6 attacks d4, while White's bishop on b5 attacks it; ...Ne4 can hit c5 and f2.
Candidates: Bxh6, Nc3, h3
- Bxh6 gxh6 Bxc6 bxc6: -4.5... | FEN: 1r1q1rk1/ppp1bpp1/2n1pn1p/1BPp1b2/Q2P1B2/4PN2/PP3PPP/RN2K2R w KQ - 0 10
Side to move: white
Board:
8 . r . q . r k .
7 p p p . b p p .
6 . . n . p n . p
5 . B P p . b . .
4 Q . . P . B . .
3 . . . . P N . .
2 P P . . . P P P
1 R N . . K . . R
a b c d e f g h
Find the best move for white. Think first: list candid... | Position: Material is equal, and both sides have the bishop pair; Black's king is castled while White's remains in the centre, with White's b1-knight still undeveloped. Black's knight on c6 attacks d4, while White's bishop on b5 attacks it; ...Ne4 can hit c5 and f2.
Candidates: Bxh6, Nc3, h3
- Bxh6 gxh6 Bxc6 bxc6: -4.5... | h3 | true | 0 | [{"cost": 0.0016408, "seconds": 23.87, "reasoning_tokens": 2233, "flags": [], "critic_cost": 0.001563475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003204 | false | null | null | null |
lichess:cDq1pOEU#ply18 | lichess:cDq1pOEU | games | r1b1k2r/pp1n1pp1/2pb1n1p/q2p2B1/3P4/2NBP3/PP1N1PPP/R2QK2R w KQkq - 0 10 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c2c4",
"e7e6",
"b1c3",
"d7d5",
"c1g5",
"c7c6",
"e2e3",
"b8d7",
"g1f3",
"d8a5",
"c4d5",
"e6d5",
"f3d2",
"f8d6",
"f1d3",
"h7h6"
] | false | white | opening | [
{
"move": "Nxd5",
"line": "Nxd5 Qxd5 Bxf6 Nxf6",
"score": "-6.73"
},
{
"move": "Nb3",
"line": "Nb3 Qc7 Bh4 O-O",
"score": "+0.09"
},
{
"move": "Bh4",
"line": "Bh4 O-O O-O Qc7",
"score": "+0.63"
}
] | Bh4 | g5h4 | g5h4 | Bh4 | false | {"position":{"side_to_move":"white","move_number":10,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nf3 Qa5 cxd5 exd5 Nd2 Bd6 Bd3 h6","opening":"D52 Queen's Gambit Declined: Cambridge Springs Defense","material":{"white":{"... | {"position": "White and Black have equal material and both retain the bishop pair; neither king has castled, and Black's bishop on c8 is undeveloped. Black's h-pawn attacks White's bishop on g5, while Black's queen on a5 attacks the knight on c3 and pawn on a2.", "notes": {"Nxd5": "Nxd5 takes the pawn, but ...Qxd5 wins... | Position: White and Black have equal material and both retain the bishop pair; neither king has castled, and Black's bishop on c8 is undeveloped. Black's h-pawn attacks White's bishop on g5, while Black's queen on a5 attacks the knight on c3 and pawn on a2.
Candidates: Nxd5, Nb3, Bh4
- Nxd5 Qxd5 Bxf6 Nxf6: -6.73
Nxd5... | FEN: r1b1k2r/pp1n1pp1/2pb1n1p/q2p2B1/3P4/2NBP3/PP1N1PPP/R2QK2R w KQkq - 0 10
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White and Black have equal material and both retain the bishop pair; neither king has castled, and Black's bishop on c8 is undeveloped. Black's h-pawn attacks White's bishop on g5, while Black's queen on a5 attacks the knight on c3 and pawn on a2.
Candidates: Nxd5, Nb3, Bh4
- Nxd5 Qxd5 Bxf6 Nxf6: -6.73
Nxd5... | Bh4 | true | 0 | [{"cost": 0.0008433, "seconds": 10.83, "reasoning_tokens": 688, "flags": [], "critic_cost": 0.001933975, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.002777 | false | null | null | null |
lichess:fE5brvji#ply17 | lichess:fE5brvji | games | rn1q1rk1/1b1pppbp/p4np1/1PpP4/P7/R1N1PN2/1P3PPP/2BQKB1R b K - 2 9 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c2c4",
"c7c5",
"d4d5",
"b7b5",
"c4b5",
"a7a6",
"e2e3",
"g7g6",
"b1c3",
"f8g7",
"g1f3",
"e8g8",
"a2a4",
"c8b7",
"a1a3"
] | false | black | opening | [
{
"move": "e6",
"line": "e6 d6 axb5 Bxb5",
"score": "-0.36"
},
{
"move": "Nxd5",
"line": "Nxd5 Nxd5 e6 Nc3",
"score": "-4.51"
},
{
"move": "axb5",
"line": "axb5 Bxb5 e6 dxe6",
"score": "-0.79"
}
] | e6 | e7e6 | e7e6 | e6 | false | {"position":{"side_to_move":"black","move_number":9,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O"],"black":[]},"en_passant_square":null,"recent_moves":"g6 Nc3 Bg7 Nf3 O-O a4 Bb7 Ra3","opening":"A57 Benko Gambit Accepted: Modern Variation","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight... | {"position": "White is a pawn up and has advanced pawns on b5 and d5; Black has the bishop pair and a safely castled king, while White's king remains on e1 and both bishops are undeveloped. Black's knight on f6 and bishop on b7 both attack the d5-pawn, so it is under immediate pressure.", "notes": {"e6": "Black advance... | Position: White is a pawn up and has advanced pawns on b5 and d5; Black has the bishop pair and a safely castled king, while White's king remains on e1 and both bishops are undeveloped. Black's knight on f6 and bishop on b7 both attack the d5-pawn, so it is under immediate pressure.
Candidates: e6, Nxd5, axb5
- e6 d6 a... | FEN: rn1q1rk1/1b1pppbp/p4np1/1PpP4/P7/R1N1PN2/1P3PPP/2BQKB1R b K - 2 9
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a pawn up and has advanced pawns on b5 and d5; Black has the bishop pair and a safely castled king, while White's king remains on e1 and both bishops are undeveloped. Black's knight on f6 and bishop on b7 both attack the d5-pawn, so it is under immediate pressure.
Candidates: e6, Nxd5, axb5
- e6 d6 a... | e6 | true | 2 | [{"cost": 0.00235655, "seconds": 35.76, "reasoning_tokens": 3624, "flags": [], "critic_cost": 0.002998975, "critic_tool_calls": 0, "false_claims": [{"quote": "without easing the pressure on d5.", "why": "After dxe6, White's d-pawn has left d5, and fxe6 captures it. There is no longer a white pawn on d5 to be under pres... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.011834 | false | null | null | null |
lichess:U58uRK44#ply14 | lichess:U58uRK44 | games | rn2kb1r/1bp1pppp/p2q1n2/1p6/3P4/1BN2N2/PPP2PPP/R1BQK2R w KQkq - 2 8 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"d7d5",
"e4d5",
"d8d5",
"b1c3",
"d5d6",
"d2d4",
"g8f6",
"g1f3",
"a7a6",
"f1c4",
"b7b5",
"c4b3",
"c8b7"
] | false | white | opening | [
{
"move": "O-O",
"line": "O-O c5 dxc5 Qxd1",
"score": "+0.27"
},
{
"move": "Bxf7+",
"line": "Bxf7+ Kxf7 O-O Kg8",
"score": "-4.81"
},
{
"move": "Ng5",
"line": "Ng5 e6 O-O c5",
"score": "+0.93"
}
] | Ng5 | f3g5 | f3g5 | Ng5 | false | {"position":{"side_to_move":"white","move_number":8,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"d4 Nf6 Nf3 a6 Bc4 b5 Bb3 Bb7","opening":"B01 Scandinavian Defense: Bronstein Variation","material":{"white":{"queen":1,"rook... | {"position": "Material is level; White's bishop on b3 eyes f7, but White's king is uncastled and the bishop on c1 is undeveloped. Black's queen on d6 attacks d4 and h2, while Black's king is also uncastled and ...c5 can challenge White's d-pawn.", "notes": {"O-O": "O-O secures White's king and puts the rook on f1, but ... | Position: Material is level; White's bishop on b3 eyes f7, but White's king is uncastled and the bishop on c1 is undeveloped. Black's queen on d6 attacks d4 and h2, while Black's king is also uncastled and ...c5 can challenge White's d-pawn.
Candidates: O-O, Bxf7+, Ng5
- O-O c5 dxc5 Qxd1: +0.27
O-O secures White's ki... | FEN: rn2kb1r/1bp1pppp/p2q1n2/1p6/3P4/1BN2N2/PPP2PPP/R1BQK2R w KQkq - 2 8
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level; White's bishop on b3 eyes f7, but White's king is uncastled and the bishop on c1 is undeveloped. Black's queen on d6 attacks d4 and h2, while Black's king is also uncastled and ...c5 can challenge White's d-pawn.
Candidates: O-O, Bxf7+, Ng5
- O-O c5 dxc5 Qxd1: +0.27
O-O secures White's ki... | Ng5 | true | 1 | [{"cost": 0.00240255, "seconds": 38.79, "reasoning_tokens": 3776, "flags": [], "critic_cost": 0.0040595, "critic_tool_calls": 5, "false_claims": [{"quote": "White with the c-pawn", "why": "After dxc5, the pawn on c5 is White’s d-pawn; White’s original c-pawn remains on c2."}]}, {"cost": 0.00045204, "seconds": 8.33, "re... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.009999 | false | null | null | null |
lichess:53v9qwbx#ply19 | lichess:53v9qwbx | games | r1bq1rk1/pp2bpp1/2nppn1p/4P3/3P1B2/2N2N2/PP2BPPP/R2Q1RK1 b - - 0 10 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"b8c6",
"c2c3",
"d7d6",
"d2d4",
"c5d4",
"c3d4",
"g8f6",
"b1c3",
"h7h6",
"f1e2",
"e7e6",
"e1g1",
"f8e7",
"c1f4",
"e8g8",
"e4e5"
] | false | black | opening | [
{
"move": "dxe5",
"line": "dxe5 dxe5 Nd5 Nxd5",
"score": "-0.28"
},
{
"move": "Nh7",
"line": "Nh7 Bd3 dxe5 dxe5",
"score": "-0.61"
},
{
"move": "Nd5",
"line": "Nd5 Nxd5 exd5 Rc1",
"score": "-0.16"
},
{
"move": "Nxe5",
"line": "Nxe5 dxe5 dxe5 Bxe5",
"score"... | Nd5 | f6d5 | f6d5 | Nd5 | false | {"position":{"side_to_move":"black","move_number":10,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"h6 Be2 e6 O-O Be7 Bf4 O-O e5","opening":"B30 Sicilian Defense: Old Sicilian","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":7,"... | {"position": "Material is level; both kings are castled, and Black's bishop on c8 is undeveloped while White's bishop on f4 is active. White's e5-pawn attacks the knight on f6 and pawn on d6, while Black's knight on c6 presses d4, so Black must address the e5 tension.", "notes": {"dxe5": "Black's ...dxe5 removes White'... | Position: Material is level; both kings are castled, and Black's bishop on c8 is undeveloped while White's bishop on f4 is active. White's e5-pawn attacks the knight on f6 and pawn on d6, while Black's knight on c6 presses d4, so Black must address the e5 tension.
Candidates: dxe5, Nh7, Nd5, Nxe5
- dxe5 dxe5 Nd5 Nxd5: ... | FEN: r1bq1rk1/pp2bpp1/2nppn1p/4P3/3P1B2/2N2N2/PP2BPPP/R2Q1RK1 b - - 0 10
Side to move: black
Recent moves: 8... Be7 9. Bf4 O-O 10. e5
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Bes... | Position: Material is level; both kings are castled, and Black's bishop on c8 is undeveloped while White's bishop on f4 is active. White's e5-pawn attacks the knight on f6 and pawn on d6, while Black's knight on c6 presses d4, so Black must address the e5 tension.
Candidates: dxe5, Nh7, Nd5, Nxe5
- dxe5 dxe5 Nd5 Nxd5: ... | Nd5 | true | 1 | [{"cost": 0.00249955, "seconds": 34.22, "reasoning_tokens": 3798, "flags": [], "critic_cost": 0.0036909950000000003, "critic_tool_calls": 5, "false_claims": [{"quote": "trading the f6-knight for White's c3-knight", "why": "In the given line, White's Nxd5 captures the f6-knight, but no black move recaptures White's knig... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010181 | false | null | null | null |
lichess:c09CJixF#ply17 | lichess:c09CJixF | games | r1bq1rk1/pp1n1ppp/4pn2/2pp2B1/1bPP4/2NBP3/PP1N1PPP/R2Q1RK1 b - - 1 9 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c2c4",
"e7e6",
"b1c3",
"d7d5",
"c1g5",
"b8d7",
"e2e3",
"c7c6",
"g1f3",
"f8b4",
"f3d2",
"e8g8",
"f1d3",
"c6c5",
"e1g1"
] | false | black | opening | [
{
"move": "Bxc3",
"line": "Bxc3 bxc3 h6 Bh4",
"score": "-0.93"
},
{
"move": "h6",
"line": "h6 Bh4 cxd4 exd4",
"score": "-0.41"
},
{
"move": "dxc4",
"line": "dxc4 Nxc4 cxd4 exd4",
"score": "-0.36"
}
] | dxc4 | d5c4 | c5d4 | cxd4 | true | {"position":{"side_to_move":"black","move_number":9,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"c6 Nf3 Bb4 Nd2 O-O Bd3 c5 O-O","opening":"D52 Queen's Gambit Declined","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":8,"points"... | {"position": "Material is equal, and both kings are castled behind intact pawn shields. The centre is tense: Black can capture on c4 or d4, while Black's bishop on b4 attacks White's knight on c3, White's bishop on g5 attacks Black's knight on f6, and White's bishop on d3 eyes h7; Black's bishop on c8 is undeveloped.",... | Position: Material is equal, and both kings are castled behind intact pawn shields. The centre is tense: Black can capture on c4 or d4, while Black's bishop on b4 attacks White's knight on c3, White's bishop on g5 attacks Black's knight on f6, and White's bishop on d3 eyes h7; Black's bishop on c8 is undeveloped.
Candi... | FEN: r1bq1rk1/pp1n1ppp/4pn2/2pp2B1/1bPP4/2NBP3/PP1N1PPP/R2Q1RK1 b - - 1 9
Side to move: black
Recent moves: 7... O-O 8. Bd3 c5 9. O-O
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Bes... | Position: Material is equal, and both kings are castled behind intact pawn shields. The centre is tense: Black can capture on c4 or d4, while Black's bishop on b4 attacks White's knight on c3, White's bishop on g5 attacks Black's knight on f6, and White's bishop on d3 eyes h7; Black's bishop on c8 is undeveloped.
Candi... | dxc4 | true | 2 | [{"cost": 0.001797675, "seconds": 25.19, "reasoning_tokens": 2502, "flags": [], "critic_cost": 0.005237175, "critic_tool_calls": 10, "false_claims": [{"quote": "...cxd4 exd4 exchanges the d-pawns", "why": "In this line Black’s c-pawn captures White’s d-pawn and White’s e-pawn recaptures it; Black’s d-pawn remains on d5... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.014714 | false | null | null | null |
lichess:shti8vwA#ply26 | lichess:shti8vwA | games | r2q1rk1/1pp2pp1/p1n1p3/3p1b2/3P3p/P1P3P1/1P1BPPBP/R2QR1K1 w - - 0 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"g1f3",
"d7d5",
"d2d4",
"g8f6",
"g2g3",
"c8f5",
"f1g2",
"e7e6",
"e1g1",
"b8c6",
"f1e1",
"a7a6",
"b1d2",
"f8b4",
"a2a3",
"b4d2",
"d1d2",
"e8g8",
"c2c3",
"f6e4",
"d2d1",
"h7h5",
"f3d2",
"e4d2",
"c1d2",
"h5h4"
] | false | white | middlegame | [
{
"move": "Bxd5",
"line": "Bxd5 exd5 gxh4 Qd7",
"score": "-6.35"
},
{
"move": "Bf4",
"line": "Bf4 h3 e4 dxe4",
"score": "+0.40"
}
] | Bf4 | d2f4 | e2e4 | e4 | true | {"position":{"side_to_move":"white","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"c3 Ne4 Qd1 h5 Nd2 Nxd2 Bxd2 h4","opening":"D02 Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan","material":{"white":{"queen":1,"rook":2,"... | {"position": "Material is level, but White has the bishop pair against Black's bishop and knight. Black's pawn on h4 attacks White's pawn on g3, and Black's knight on c6 pressures d4. Both kings are castled, though ...h3 can attack White's bishop on g2.", "notes": {"Bxd5": "Bxd5 takes the d5-pawn and attacks Black's kn... | Position: Material is level, but White has the bishop pair against Black's bishop and knight. Black's pawn on h4 attacks White's pawn on g3, and Black's knight on c6 pressures d4. Both kings are castled, though ...h3 can attack White's bishop on g2.
Candidates: Bxd5, Bf4
- Bxd5 exd5 gxh4 Qd7: -6.35
Bxd5 takes the d5-... | FEN: r2q1rk1/1pp2pp1/p1n1p3/3p1b2/3P3p/P1P3P1/1P1BPPBP/R2QR1K1 w - - 0 14
Side to move: white
Recent moves: 12. Nd2 Nxd2 13. Bxd2 h4
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best... | Position: Material is level, but White has the bishop pair against Black's bishop and knight. Black's pawn on h4 attacks White's pawn on g3, and Black's knight on c6 pressures d4. Both kings are castled, though ...h3 can attack White's bishop on g2.
Candidates: Bxd5, Bf4
- Bxd5 exd5 gxh4 Qd7: -6.35
Bxd5 takes the d5-... | Bf4 | true | 1 | [{"cost": 0.00157055, "seconds": 21.15, "reasoning_tokens": 2195, "flags": ["move not on the shown lines: Nc6"]}, {"cost": 0.000433615, "seconds": 6.39, "reasoning_tokens": 478, "flags": [], "critic_cost": 0.001969225, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003973 | false | null | null | null |
lichess:nrXPWs0f#ply38 | lichess:nrXPWs0f | games | r1b1r3/pp4kp/6P1/2p5/3n4/8/PB3PP1/RN2K2R w KQ - 1 20 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"f1c4",
"f8c5",
"b2b4",
"c5b4",
"c2c3",
"b4e7",
"d2d4",
"e5d4",
"c3d4",
"g8f6",
"e4e5",
"f6h5",
"h2h4",
"d7d5",
"e5d6",
"d8d6",
"f3g5",
"e7g5",
"c4f7",
"e8f7",
"d1h5",
"g7g6",
"h5g5",
"d6d4",
"g5f4",
"f7g7",
"f4d4",
"c6d4"... | false | white | middlegame | [
{
"move": "Kd2",
"line": "Kd2 Re2+ Kd1 Rxb2",
"score": "-7.25"
},
{
"move": "Kd1",
"line": "Kd1 Kxg6 Nd2 Bf5",
"score": "-0.83"
},
{
"move": "Kf1",
"line": "Kf1 Bf5 Nd2 Kxg6",
"score": "-0.90"
}
] | Kd1 | e1d1 | e1d1 | Kd1 | false | {"position":{"side_to_move":"white","move_number":20,"phase":"middlegame","in_check":true,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Qxd4+ Nxd4 Bb2 Rd8 h5 c5 hxg6 Re8+","opening":"C51 Italian Game: Evans Gambit, Anderssen Variation","material":{"white":{"rook":2,"bis... | {"position": "Material is equal, but White's king is in check from the rook on e8 along the open e-file, while White's bishop on b2 attacks Black's knight on d4. Black can take White's exposed pawn on g6 with ...Kxg6 once the check is answered.", "notes": {"Kd2": "Kd2 escapes the e-file check, but ...Re2+ gives a secon... | Position: Material is equal, but White's king is in check from the rook on e8 along the open e-file, while White's bishop on b2 attacks Black's knight on d4. Black can take White's exposed pawn on g6 with ...Kxg6 once the check is answered.
Candidates: Kd2, Kd1, Kf1
- Kd2 Re2+ Kd1 Rxb2: -7.25
Kd2 escapes the e-file c... | FEN: r1b1r3/pp4kp/6P1/2p5/3n4/8/PB3PP1/RN2K2R w KQ - 1 20
Side to move: white
Board:
8 r . b . r . . .
7 p p . . . . k p
6 . . . . . . P .
5 . . p . . . . .
4 . . . n . . . .
3 . . . . . . . .
2 P B . . . P P .
1 R N . . K . . R
a b c d e f g h
Find the best move for white. Think first: list candidate moves, give eac... | Position: Material is equal, but White's king is in check from the rook on e8 along the open e-file, while White's bishop on b2 attacks Black's knight on d4. Black can take White's exposed pawn on g6 with ...Kxg6 once the check is answered.
Candidates: Kd2, Kd1, Kf1
- Kd2 Re2+ Kd1 Rxb2: -7.25
Kd2 escapes the e-file c... | Kd1 | true | 2 | [{"cost": 0.0012758, "seconds": 18.64, "reasoning_tokens": 1684, "flags": [], "critic_cost": 0.00336427, "critic_tool_calls": 1, "false_claims": [{"quote": "Re2+ drives White's king back to d1", "why": "The check does not force the king to d1; after ...Re2+, White can also legally move to c1, c3, or d3."}, {"quote": "l... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010776 | false | null | null | null |
lichess:kIny6rsz#ply29 | lichess:kIny6rsz | games | 2rq1rk1/1b1n2bp/p1pp2p1/1p2pp2/PP1P4/2P1PN2/1BQ1BPPP/R4RK1 b - - 1 15 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d6",
"g1f3",
"g7g6",
"e2e3",
"f8g7",
"f1e2",
"c7c6",
"b1d2",
"b7b5",
"c2c3",
"a7a6",
"a2a4",
"c8b7",
"b2b3",
"g8f6",
"c1b2",
"b8d7",
"e1g1",
"e8g8",
"d1c2",
"a8c8",
"b3b4",
"e7e5",
"d2e4",
"f6e4",
"c2e4",
"f7f5",
"e4c2"
] | false | black | middlegame | [
{
"move": "e4",
"line": "e4 Nd2 Nb6 a5",
"score": "+0.71"
},
{
"move": "d5",
"line": "d5 dxe5 Nxe5 Nd4",
"score": "+0.14"
},
{
"move": "Re8",
"line": "Re8 dxe5 d5 g3",
"score": "+0.10"
},
{
"move": "exd4",
"line": "exd4 Qb3+ d5 cxd4",
"score": "-0.28"
}
... | e4 | e5e4 | e5e4 | e4 | false | {"position":{"side_to_move":"black","move_number":15,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Rc8 b4 e5 Ne4 Nxe4 Qxe4 f5 Qc2","opening":"A41 Queen's Pawn Game","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":1,"pawn":8,"points":... | {"position": "Material is level, both sides have a bishop pair, and the kings are castled on g1 and g8. Black's e5 pawn attacks d4 and the b5 pawn attacks a4, while White's queen on c2 targets f5 and knight on f3 attacks e5; the center is tense.", "notes": {"e4": "Black's ...e4 gains space and attacks White's knight on... | Position: Material is level, both sides have a bishop pair, and the kings are castled on g1 and g8. Black's e5 pawn attacks d4 and the b5 pawn attacks a4, while White's queen on c2 targets f5 and knight on f3 attacks e5; the center is tense.
Candidates: e4, d5, Re8, exd4
- e4 Nd2 Nb6 a5: +0.71
Black's ...e4 gains spa... | FEN: 2rq1rk1/1b1n2bp/p1pp2p1/1p2pp2/PP1P4/2P1PN2/1BQ1BPPP/R4RK1 b - - 1 15
Side to move: black
Recent moves: 11... Rc8 12. b4 e5 13. Ne4 Nxe4 14. Qxe4 f5 15. Qc2
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick th... | Position: Material is level, both sides have a bishop pair, and the kings are castled on g1 and g8. Black's e5 pawn attacks d4 and the b5 pawn attacks a4, while White's queen on c2 targets f5 and knight on f3 attacks e5; the center is tense.
Candidates: e4, d5, Re8, exd4
- e4 Nd2 Nb6 a5: +0.71
Black's ...e4 gains spa... | e4 | true | 0 | [{"cost": 0.0030843, "seconds": 41.64, "reasoning_tokens": 5058, "flags": [], "critic_cost": 0.0033498900000000003, "critic_tool_calls": 4, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006434 | false | null | null | null |
lichess:3G4IECfc#ply21 | lichess:3G4IECfc | games | rnb1k2r/1pq1bpp1/p1p2n1p/P3p3/4P3/2N2N1P/1PPBBPP1/R2Q1RK1 b kq - 0 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"d7d6",
"d2d4",
"d8e7",
"b1c3",
"c7c6",
"c1d2",
"h7h6",
"f1e2",
"g8f6",
"d4e5",
"d6e5",
"h2h3",
"e7c7",
"e1g1",
"f8e7",
"a2a4",
"a7a6",
"a4a5"
] | false | black | opening | [
{
"move": "Nbd7",
"line": "Nbd7 Re1 Nc5 Bc4",
"score": "-0.56"
},
{
"move": "Bxh3",
"line": "Bxh3 gxh3 Nbd7 Bc4",
"score": "-5.50"
},
{
"move": "O-O",
"line": "O-O Na4 Nbd7 Bd3",
"score": "-0.98"
},
{
"move": "Be6",
"line": "Be6 Na4 Nbd7 Bd3",
"score": "-0... | Be6 | c8e6 | c8e6 | Be6 | false | {"position":{"side_to_move":"black","move_number":11,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"dxe5 h3 Qc7 O-O Be7 a4 a6 a5","opening":"C41 Philidor Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":7,"p... | {"position": "Material is even; White's king is castled, while Black's king remains on e8 with the d-file open and the b8-knight and c8-bishop undeveloped. White's bishops bear on h6 and a6, while Black's queen eyes a5 and the knight on f6 attacks e4.", "notes": {"Nbd7": "Develops the b8-knight; White replies Re1, and ... | Position: Material is even; White's king is castled, while Black's king remains on e8 with the d-file open and the b8-knight and c8-bishop undeveloped. White's bishops bear on h6 and a6, while Black's queen eyes a5 and the knight on f6 attacks e4.
Candidates: Nbd7, Bxh3, O-O, Be6
- Nbd7 Re1 Nc5 Bc4: -0.56
Develops th... | FEN: rnb1k2r/1pq1bpp1/p1p2n1p/P3p3/4P3/2N2N1P/1PPBBPP1/R2Q1RK1 b kq - 0 11
Side to move: black
Board:
8 r n b . k . . r
7 . p q . b p p .
6 p . p . . n . p
5 P . . . p . . .
4 . . . . P . . .
3 . . N . . N . P
2 . P P B B P P .
1 R . . Q . R K .
a b c d e f g h
Find the best move for black. Think first: list candidat... | Position: Material is even; White's king is castled, while Black's king remains on e8 with the d-file open and the b8-knight and c8-bishop undeveloped. White's bishops bear on h6 and a6, while Black's queen eyes a5 and the knight on f6 attacks e4.
Candidates: Nbd7, Bxh3, O-O, Be6
- Nbd7 Re1 Nc5 Bc4: -0.56
Develops th... | Be6 | true | 0 | [{"cost": 0.001778675, "seconds": 22.07, "reasoning_tokens": 2468, "flags": [], "critic_cost": 0.00219345, "critic_tool_calls": 4, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003972 | false | null | null | null |
lichess:Pjogm2oo#ply6 | lichess:Pjogm2oo | games | rnbqkb1r/pp2pppp/2pp1n2/8/4PP2/2N5/PPPP2PP/R1BQKBNR w KQkq - 0 4 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"d7d6",
"f2f4",
"g8f6",
"b1c3",
"c7c6"
] | false | white | opening | [
{
"move": "Nf3",
"line": "Nf3 e5 fxe5 dxe5",
"score": "+0.84"
},
{
"move": "e5",
"line": "e5 Nd5 Nxd5 cxd5",
"score": "+0.58"
},
{
"move": "d4",
"line": "d4 g6 Nf3 Bg7",
"score": "+0.95"
}
] | d4 | d2d4 | d2d4 | d4 | false | {"position":{"side_to_move":"white","move_number":4,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"e4 d6 f4 Nf6 Nc3 c6","opening":"B00 Rat Defense: Harmonist","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"p... | {"position": "Material is level and both kings are uncastled; White has pawns on e4 and f4 against Black's central pawns on c6 and d6. White's knight on c3 is developed, while Black's knight on f6 attacks the e4-pawn.", "notes": {"Nf3": "Nf3 develops White's knight and supports e5; ...e5 attacks White's f4-pawn, so fxe... | Position: Material is level and both kings are uncastled; White has pawns on e4 and f4 against Black's central pawns on c6 and d6. White's knight on c3 is developed, while Black's knight on f6 attacks the e4-pawn.
Candidates: Nf3, e5, d4
- Nf3 e5 fxe5 dxe5: +0.84
Nf3 develops White's knight and supports e5; ...e5 att... | FEN: rnbqkb1r/pp2pppp/2pp1n2/8/4PP2/2N5/PPPP2PP/R1BQKBNR w KQkq - 0 4
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level and both kings are uncastled; White has pawns on e4 and f4 against Black's central pawns on c6 and d6. White's knight on c3 is developed, while Black's knight on f6 attacks the e4-pawn.
Candidates: Nf3, e5, d4
- Nf3 e5 fxe5 dxe5: +0.84
Nf3 develops White's knight and supports e5; ...e5 att... | d4 | true | 0 | [{"cost": 0.00121755, "seconds": 21.22, "reasoning_tokens": 1486, "flags": [], "critic_cost": 0.001322475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00254 | false | null | null | null |
lichess:FDqIlM4W#ply8 | lichess:FDqIlM4W | games | r1bqkb1r/1ppp1ppp/p1n2n2/1B2p3/4P3/2P2N2/PP1P1PPP/RNBQK2R w KQkq - 0 5 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"f1b5",
"g8f6",
"c2c3",
"a7a6"
] | false | white | opening | [
{
"move": "Nxe5",
"line": "Nxe5 axb5 Nxc6 dxc6",
"score": "-7.10"
},
{
"move": "Bxc6",
"line": "Bxc6 dxc6 Qc2 Nh5",
"score": "+0.12"
},
{
"move": "Ba4",
"line": "Ba4 Nxe4 Qe2 Nc5",
"score": "-0.62"
}
] | Bxc6 | b5c6 | b5c6 | Bxc6 | false | {"position":{"side_to_move":"white","move_number":5,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"e4 e5 Nf3 Nc6 Bb5 Nf6 c3 a6","opening":"C65 Ruy Lopez: Berlin Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"k... | {"position": "Material is equal, but both kings remain uncastled; White has developed the bishop on b5 and knight on f3, while the b1-knight and c1-bishop are still undeveloped. Black's ...a6 attacks the bishop, and the knight on f6 attacks White's e4-pawn, so ...axb5 and ...Nxe4 are immediate threats.", "notes": {"Nxe... | Position: Material is equal, but both kings remain uncastled; White has developed the bishop on b5 and knight on f3, while the b1-knight and c1-bishop are still undeveloped. Black's ...a6 attacks the bishop, and the knight on f6 attacks White's e4-pawn, so ...axb5 and ...Nxe4 are immediate threats.
Candidates: Nxe5, Bx... | FEN: r1bqkb1r/1ppp1ppp/p1n2n2/1B2p3/4P3/2P2N2/PP1P1PPP/RNBQK2R w KQkq - 0 5
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is equal, but both kings remain uncastled; White has developed the bishop on b5 and knight on f3, while the b1-knight and c1-bishop are still undeveloped. Black's ...a6 attacks the bishop, and the knight on f6 attacks White's e4-pawn, so ...axb5 and ...Nxe4 are immediate threats.
Candidates: Nxe5, Bx... | Bxc6 | true | 0 | [{"cost": 0.0013343, "seconds": 22.62, "reasoning_tokens": 1586, "flags": [], "critic_cost": 0.0030666649999999997, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.004401 | false | null | null | null |
lichess:NZbEQbrO#ply24 | lichess:NZbEQbrO | games | r1bq1rk1/p2n1pbp/4p1p1/2ppP3/5P2/2N1B3/PPPQ2PP/2KR1B1R w - - 0 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"g1f3",
"b8c6",
"d2d4",
"c5d4",
"f3d4",
"g7g6",
"c1e3",
"f8g7",
"f2f3",
"g8f6",
"b1c3",
"e8g8",
"d1d2",
"d7d5",
"d4c6",
"b7c6",
"e4e5",
"f6d7",
"f3f4",
"e7e6",
"e1c1",
"c6c5"
] | false | white | middlegame | [
{
"move": "Bf2",
"line": "Bf2 d4 Ne4 Bb7",
"score": "-1.62"
},
{
"move": "Nxd5",
"line": "Nxd5 exd5 Qxd5 Rb8",
"score": "+0.00"
},
{
"move": "Na4",
"line": "Na4 d4 Bf2 Bb7",
"score": "-1.52"
},
{
"move": "Qxd5",
"line": "Qxd5 exd5 Nxd5 Kh8",
"score": "-8.5... | Nxd5 | c3d5 | c3d5 | Nxd5 | false | {"position":{"side_to_move":"white","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Nxc6 bxc6 e5 Nd7 f4 e6 O-O-O c5","opening":"B32 Sicilian Defense: Accelerated Dragon","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":... | {"position": "Material is level, and both sides retain their bishop pair; White's rook on d1 occupies a half-open file, while the kings sit on c1 and g8. White's e5-pawn is attacked by Black's knight on d7 and bishop on g7 but supported by f4; Black can play ...d4 to hit White's knight on c3 and bishop on e3.", "notes"... | Position: Material is level, and both sides retain their bishop pair; White's rook on d1 occupies a half-open file, while the kings sit on c1 and g8. White's e5-pawn is attacked by Black's knight on d7 and bishop on g7 but supported by f4; Black can play ...d4 to hit White's knight on c3 and bishop on e3.
Candidates: B... | FEN: r1bq1rk1/p2n1pbp/4p1p1/2ppP3/5P2/2N1B3/PPPQ2PP/2KR1B1R w - - 0 13
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, and both sides retain their bishop pair; White's rook on d1 occupies a half-open file, while the kings sit on c1 and g8. White's e5-pawn is attacked by Black's knight on d7 and bishop on g7 but supported by f4; Black can play ...d4 to hit White's knight on c3 and bishop on e3.
Candidates: B... | Nxd5 | true | 2 | [{"cost": 0.002844675, "seconds": 40.18, "reasoning_tokens": 4525, "flags": ["move not on the shown lines: Bxh1"]}, {"cost": 0.000630385, "seconds": 8.46, "reasoning_tokens": 736, "flags": [], "critic_cost": 0.003991435000000001, "critic_tool_calls": 4, "false_claims": [{"quote": "Black has won the queen for that pawn.... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010629 | false | null | null | null |
lichess:5gI4iUCA#ply24 | lichess:5gI4iUCA | games | r3kb1r/ppp1qp1p/8/3ppb2/8/2QP1NP1/PPP1n2P/R1B1K2R w KQkq - 0 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"b1c3",
"g8f6",
"f2f4",
"d7d5",
"f4e5",
"f6e4",
"d1f3",
"b8c6",
"c3e4",
"c6d4",
"e4f6",
"g7f6",
"f3c3",
"f6e5",
"f1e2",
"c8f5",
"d2d3",
"d8h4",
"g2g3",
"h4e7",
"g1f3",
"d4e2"
] | false | white | middlegame | [
{
"move": "Qc6+",
"line": "Qc6+ bxc6 Kxe2 Bg4",
"score": "-10.84"
},
{
"move": "Kxe2",
"line": "Kxe2 f6 Kf2 O-O-O",
"score": "-4.73"
},
{
"move": "Qxe5",
"line": "Qxe5 Nxc1 Qxe7+ Bxe7",
"score": "-6.87"
}
] | Kxe2 | e1e2 | e1e2 | Kxe2 | false | {"position":{"side_to_move":"white","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Be2 Bf5 d3 Qh4+ g3 Qe7 Nf3 Nxe2","opening":"C29 Vienna Game: Vienna Gambit, Paulsen Attack","material":{"white":{"queen"... | {"position": "White is a bishop and a pawn down, and Black's knight on e2 attacks White's queen on c3 and bishop on c1. Black's bishop on f5 hits d3, while ...Nxc3 threatens to take the queen.", "notes": {"Qc6+": "Qc6+ checks the Black king, but ...bxc6 captures White's queen; Kxe2 takes the knight and ...Bg4 attacks W... | Position: White is a bishop and a pawn down, and Black's knight on e2 attacks White's queen on c3 and bishop on c1. Black's bishop on f5 hits d3, while ...Nxc3 threatens to take the queen.
Candidates: Qc6+, Kxe2, Qxe5
- Qc6+ bxc6 Kxe2 Bg4: -10.84
Qc6+ checks the Black king, but ...bxc6 captures White's queen; Kxe2 ta... | FEN: r3kb1r/ppp1qp1p/8/3ppb2/8/2QP1NP1/PPP1n2P/R1B1K2R w KQkq - 0 13
Side to move: white
Recent moves: 9. Be2 Bf5 10. d3 Qh4+ 11. g3 Qe7 12. Nf3 Nxe2
Board:
8 r . . . k b . r
7 p p p . q p . p
6 . . . . . . . .
5 . . . p p b . .
4 . . . . . . . .
3 . . Q P . N P .
2 P P P . n . . P
1 R . B . K . . R
a b c d e f g h
F... | Position: White is a bishop and a pawn down, and Black's knight on e2 attacks White's queen on c3 and bishop on c1. Black's bishop on f5 hits d3, while ...Nxc3 threatens to take the queen.
Candidates: Qc6+, Kxe2, Qxe5
- Qc6+ bxc6 Kxe2 Bg4: -10.84
Qc6+ checks the Black king, but ...bxc6 captures White's queen; Kxe2 ta... | Kxe2 | true | 1 | [{"cost": 0.00148855, "seconds": 19.28, "reasoning_tokens": 1963, "flags": [], "critic_cost": 0.00401452, "critic_tool_calls": 3, "false_claims": [{"quote": "leaving White a bishop down", "why": "After the sequence, White has no bishop while Black still has both bishops; the knights and pawns are equal, so White is two... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.007849 | false | null | null | null |
lichess:ksbn8n7Q#ply20 | lichess:ksbn8n7Q | games | 2kr1bnr/ppp3pp/4bp2/4p3/4P3/2NPBN2/PP2KPPP/R6R w - - 4 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d3",
"d7d5",
"e2e4",
"d5e4",
"d3e4",
"d8d1",
"e1d1",
"e7e5",
"f1d3",
"b8c6",
"c1e3",
"c6b4",
"b1c3",
"b4d3",
"c2d3",
"f7f6",
"g1f3",
"c8e6",
"d1e2",
"e8c8"
] | false | white | middlegame | [
{
"move": "Bxa7",
"line": "Bxa7 b6 a4 Kb7",
"score": "-1.32"
},
{
"move": "b3",
"line": "b3 Bd7 d4 Ba3",
"score": "-0.15"
},
{
"move": "Rhc1",
"line": "Rhc1 a6 d4 exd4",
"score": "-0.04"
},
{
"move": "Rac1",
"line": "Rac1 a6 b3 Ba3",
"score": "-0.15"
}
] | Rhc1 | h1c1 | h1c1 | Rhc1 | false | {"position":{"side_to_move":"white","move_number":11,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Nc3 Nxd3 cxd3 f6 Nf3 Be6 Ke2 O-O-O","opening":"A00 Mieses Opening","material":{"white":{"rook":2,"bishop":1,"knight":2,"pawn":7,"points":26,"bisho... | {"position": "Material is level: White has two knights and a bishop against Black's bishop pair and knight. Black's king on c8 is safer than White's central king on e2; Black's rook on d8 presses White's backward d3 pawn, while Black's knight on g8 and bishop on f8 remain undeveloped.", "notes": {"Bxa7": "Bxa7 takes Bl... | Position: Material is level: White has two knights and a bishop against Black's bishop pair and knight. Black's king on c8 is safer than White's central king on e2; Black's rook on d8 presses White's backward d3 pawn, while Black's knight on g8 and bishop on f8 remain undeveloped.
Candidates: Bxa7, b3, Rhc1, Rac1
- Bxa... | FEN: 2kr1bnr/ppp3pp/4bp2/4p3/4P3/2NPBN2/PP2KPPP/R6R w - - 4 11
Side to move: white
Recent moves: 9. Nf3 Be6 10. Ke2 O-O-O
Board:
8 . . k r . b n r
7 p p p . . . p p
6 . . . . b p . .
5 . . . . p . . .
4 . . . . P . . .
3 . . N P B N . .
2 P P . . K P P P
1 R . . . . . . R
a b c d e f g h
Find the best move for white.... | Position: Material is level: White has two knights and a bishop against Black's bishop pair and knight. Black's king on c8 is safer than White's central king on e2; Black's rook on d8 presses White's backward d3 pawn, while Black's knight on g8 and bishop on f8 remain undeveloped.
Candidates: Bxa7, b3, Rhc1, Rac1
- Bxa... | Rhc1 | true | 1 | [{"cost": 0.00405305, "seconds": 60.94, "reasoning_tokens": 7023, "flags": [], "critic_cost": 0.0051405800000000005, "critic_tool_calls": 4, "false_claims": [{"quote": "forces Ke1", "why": "After ...Bc4+, Ke1 is not forced: Kd2 is a legal response to the check."}, {"quote": "...Bf7 develops Black's bishop", "why": "The... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.015257 | false | null | null | null |
lichess:3Z6rhKHv#ply25 | lichess:3Z6rhKHv | games | r3k2r/pp1nnb1p/1qp2pp1/3p4/3P1N2/2PB1N2/PPQ2PPP/R4RK1 b kq - 0 13 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"b1c3",
"c8e6",
"e2e4",
"c7c6",
"e4e5",
"f7f5",
"e5f6",
"e7f6",
"g1f3",
"e6f7",
"f1d3",
"f8d6",
"e1g1",
"g8e7",
"c3e2",
"b8d7",
"c2c3",
"d8b6",
"d1c2",
"g7g6",
"c1f4",
"d6f4",
"e2f4"
] | false | black | middlegame | [
{
"move": "Qxb2",
"line": "Qxb2 Qxb2 Nb6 Qc1",
"score": "-8.30"
},
{
"move": "g5",
"line": "g5 Ne2 O-O-O Rfe1",
"score": "-0.95"
},
{
"move": "Qc7",
"line": "Qc7 g3 g5 Ng2",
"score": "-0.87"
},
{
"move": "Nf8",
"line": "Nf8 g3 O-O-O Rae1",
"score": "-0.94"... | Qc7 | b6c7 | b6c7 | Qc7 | false | {"position":{"side_to_move":"black","move_number":13,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nd7 c3 Qb6 Qc2 g6 Bf4 Bxf4 Nxf4","opening":"D00 Queen's Pawn Game: Chigorin Variation","material":{"white":{"queen":1,"rook":2,"bisho... | {"position": "Material is level. White's king is castled and safer, while Black's king remains on e8 with the e-file open; White's knights on f3 and f4 are active, and Black's queen on b6 attacks the d4-pawn. Black can challenge the f4-knight with ...g5 or ...Qc7 and still needs to arrange king safety.", "notes": {"Qxb... | Position: Material is level. White's king is castled and safer, while Black's king remains on e8 with the e-file open; White's knights on f3 and f4 are active, and Black's queen on b6 attacks the d4-pawn. Black can challenge the f4-knight with ...g5 or ...Qc7 and still needs to arrange king safety.
Candidates: Qxb2, g5... | FEN: r3k2r/pp1nnb1p/1qp2pp1/3p4/3P1N2/2PB1N2/PPQ2PPP/R4RK1 b kq - 0 13
Side to move: black
Legal moves: Be6, Bg8, Kd8, Kf8, Nb8, Nc5, Nc8, Ne5, Nf5, Nf8, Ng8, O-O, O-O-O, Qa5, Qa6, Qb3, Qb4, Qb5, Qc5, Qc7, Qd8, Qxb2, Qxd4, Rb8, Rc8, Rd8, Rf8, Rg8, a5, a6, c5, f5, g5, h5, h6
Find the best move for black. Think first: li... | Position: Material is level. White's king is castled and safer, while Black's king remains on e8 with the e-file open; White's knights on f3 and f4 are active, and Black's queen on b6 attacks the d4-pawn. Black can challenge the f4-knight with ...g5 or ...Qc7 and still needs to arrange king safety.
Candidates: Qxb2, g5... | Qc7 | true | 1 | [{"cost": 0.002818175, "seconds": 42.56, "reasoning_tokens": 4527, "flags": [], "critic_cost": 0.00404277, "critic_tool_calls": 4, "false_claims": [{"quote": "Black's pawn on b7 blocks the queen's route", "why": "The queen on b6 can move down the b-file to capture the pawn on b2; the pawn on b7 is behind the queen and ... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010001 | false | null | null | null |
lichess:78Aa3ri9#ply21 | lichess:78Aa3ri9 | games | r1bq1knr/1p3ppp/p2N1b2/2B1n3/4P3/2P5/PP2BPPP/RN1QK2R b KQ - 0 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"d7d6",
"d2d4",
"e5d4",
"f3d4",
"f8e7",
"f1c4",
"e7f6",
"c2c3",
"b8c6",
"c1e3",
"c6e5",
"c4e2",
"c7c5",
"d4b5",
"a7a6",
"b5d6",
"e8f8",
"e3c5"
] | false | black | opening | [
{
"move": "Qxd6",
"line": "Qxd6 Qxd6+ Ke8 Qd2",
"score": "-10.43"
},
{
"move": "Ne7",
"line": "Ne7 f4 Qc7 fxe5",
"score": "-6.98"
},
{
"move": "Be7",
"line": "Be7 Qd5 h5 Qxe5",
"score": "-7.51"
},
{
"move": "Qc7",
"line": "Qc7 Ba3 Ne7 Nxc8",
"score": "-5.1... | Qc7 | d8c7 | d8c7 | Qc7 | false | {"position":{"side_to_move":"black","move_number":11,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Ne5 Be2 c5 Nb5 a6 Nxd6+ Kf8 Bxc5","opening":"C41 Philidor Defense: Exchange Variation","material":{"white":{"queen":1,"rook":2,"bishop":... | {"position": "White is two pawns ahead, but White's knight on d6 is attacked by Black's queen and threatens Black's b7-pawn and c8-bishop. White can use Nxb7+ or Nxc8+ to uncover a check from the bishop on c5; both kings are uncastled, and Black's bishop on c8 and knight on g8 are undeveloped.", "notes": {"Qxd6": "Qxd6... | Position: White is two pawns ahead, but White's knight on d6 is attacked by Black's queen and threatens Black's b7-pawn and c8-bishop. White can use Nxb7+ or Nxc8+ to uncover a check from the bishop on c5; both kings are uncastled, and Black's bishop on c8 and knight on g8 are undeveloped.
Candidates: Qxd6, Ne7, Be7, Q... | FEN: r1bq1knr/1p3ppp/p2N1b2/2B1n3/4P3/2P5/PP2BPPP/RN1QK2R b KQ - 0 11
Side to move: black
Recent moves: 9... a6 10. Nxd6+ Kf8 11. Bxc5
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Be... | Position: White is two pawns ahead, but White's knight on d6 is attacked by Black's queen and threatens Black's b7-pawn and c8-bishop. White can use Nxb7+ or Nxc8+ to uncover a check from the bishop on c5; both kings are uncastled, and Black's bishop on c8 and knight on g8 are undeveloped.
Candidates: Qxd6, Ne7, Be7, Q... | Qc7 | true | 3 | [{"cost": 0.0029703, "seconds": 70.07, "reasoning_tokens": 4805, "flags": ["no rook on c8"]}, {"cost": 0.000792835, "seconds": 11.6, "reasoning_tokens": 1119, "flags": ["no rook on c8"]}, {"cost": 0.000675835, "seconds": 10.17, "reasoning_tokens": 887, "flags": [], "critic_cost": 0.00582507, "critic_tool_calls": 5, "fa... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.016502 | false | null | null | null |
lichess:3UX3pN17#ply27 | lichess:3UX3pN17 | games | r2q1rk1/pp1b1pbp/4pnp1/8/2QP1B2/2N2N2/PP3PPP/2R2RK1 b - - 2 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"e2e3",
"g7g6",
"g1f3",
"d7d5",
"c2c4",
"e7e6",
"b1c3",
"f8g7",
"f1d3",
"b8d7",
"e1g1",
"e8g8",
"c1d2",
"c7c5",
"d1b3",
"c5d4",
"e3d4",
"d5c4",
"d3c4",
"d7b6",
"a1c1",
"b6c4",
"b3c4",
"c8d7",
"d2f4"
] | false | black | middlegame | [
{
"move": "a6",
"line": "a6 Bg5 h6 Bxf6",
"score": "+0.24"
},
{
"move": "Qb6",
"line": "Qb6 Qe2 Bc6 Rfd1",
"score": "+0.30"
}
] | Qb6 | d8b6 | a8c8 | Rc8 | true | {"position":{"side_to_move":"black","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"dxc4 Bxc4 Nb6 Rac1 Nxc4 Qxc4 Bd7 Bf4","opening":"A45 Indian Defense","material":{"white":{"queen":1,"rook":2,"bishop":1,"knight":2,"pawn":6,"point... | {"position": "Material is equal: Black has the bishop pair, while White has two knights and a bishop. Both kings are castled with pawn cover; White's queen on c4 attacks e6, and White's rook on c1 occupies the open c-file.", "notes": {"a6": "a6 prepares ...b5, but Bg5 attacks the black knight on f6 and ...h6 chases the... | Position: Material is equal: Black has the bishop pair, while White has two knights and a bishop. Both kings are castled with pawn cover; White's queen on c4 attacks e6, and White's rook on c1 occupies the open c-file.
Candidates: a6, Qb6
- a6 Bg5 h6 Bxf6: +0.24
a6 prepares ...b5, but Bg5 attacks the black knight on ... | FEN: r2q1rk1/pp1b1pbp/4pnp1/8/2QP1B2/2N2N2/PP3PPP/2R2RK1 b - - 2 14
Side to move: black
Recent moves: 10... dxc4 11. Bxc4 Nb6 12. Rac1 Nxc4 13. Qxc4 Bd7 14. Bf4
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the... | Position: Material is equal: Black has the bishop pair, while White has two knights and a bishop. Both kings are castled with pawn cover; White's queen on c4 attacks e6, and White's rook on c1 occupies the open c-file.
Candidates: a6, Qb6
- a6 Bg5 h6 Bxf6: +0.24
a6 prepares ...b5, but Bg5 attacks the black knight on ... | Qb6 | true | 3 | [{"cost": 0.001811175, "seconds": 25.28, "reasoning_tokens": 2783, "flags": ["move not on the shown lines: Nf6", "move not on the shown lines: Nf3"]}, {"cost": 0.000388525, "seconds": 6.36, "reasoning_tokens": 433, "flags": [], "critic_cost": 0.003044525, "critic_tool_calls": 3, "false_claims": [{"quote": "without allo... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.01159 | false | null | null | null |
lichess:NLka62Mm#ply29 | lichess:NLka62Mm | games | r1bq1rk1/1pp2pp1/1b1p3p/p2Pn3/P1B1P3/2N1B2P/1P2QPP1/R3R1K1 b - - 2 15 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"f1c4",
"f8c5",
"e1g1",
"d7d6",
"c2c3",
"h7h6",
"h2h3",
"g8e7",
"a2a4",
"a7a5",
"d2d4",
"e5d4",
"c3d4",
"c5b6",
"b1c3",
"e8g8",
"f1e1",
"e7g6",
"c1e3",
"g6h4",
"d4d5",
"h4f3",
"d1f3",
"c6e5",
"f3e2"
] | false | black | middlegame | [
{
"move": "f5",
"line": "f5 Bxb6 f4 f3",
"score": "+0.09"
},
{
"move": "Bxe3",
"line": "Bxe3 fxe3 Qg5 Kh1",
"score": "+1.56"
},
{
"move": "Nf3+",
"line": "Nf3+ Qxf3 Bxe3 Rxe3",
"score": "-7.13"
},
{
"move": "Nxc4",
"line": "Nxc4 Qxc4 Ra6 Qd3",
"score": "-0... | Bxe3 | b6e3 | b6e3 | Bxe3 | false | {"position":{"side_to_move":"black","move_number":15,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Ng6 Be3 Nh4 d5 Nxf3+ Qxf3 Ne5 Qe2","opening":"C50 Italian Game: Giuoco Piano","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":1,"pawn"... | {"position": "Material is level, and both kings are castled behind intact pawn shields. White's d5-pawn cramps Black, while Black's knight on e5 attacks the bishop on c4 and the bishop on b6 attacks the bishop on e3; ...Nf3+ is a tactical check that also hits the rook on e1.", "notes": {"f5": "...f5 challenges White's ... | Position: Material is level, and both kings are castled behind intact pawn shields. White's d5-pawn cramps Black, while Black's knight on e5 attacks the bishop on c4 and the bishop on b6 attacks the bishop on e3; ...Nf3+ is a tactical check that also hits the rook on e1.
Candidates: f5, Bxe3, Nf3+, Nxc4
- f5 Bxb6 f4 f3... | FEN: r1bq1rk1/1pp2pp1/1b1p3p/p2Pn3/P1B1P3/2N1B2P/1P2QPP1/R3R1K1 b - - 2 15
Side to move: black
Recent moves: 13... Nxf3+ 14. Qxf3 Ne5 15. Qe2
Legal moves: Ba7, Bc5, Bd4, Bd7, Be6, Bf5, Bg4, Bxe3, Bxh3, Kh7, Kh8, Nc6, Nd3, Nd7, Nf3+, Ng4, Ng6, Nxc4, Qd7, Qe7, Qe8, Qf6, Qg5, Qh4, Ra6, Ra7, Rb8, Re8, c5, c6, f5, f6, g5, g... | Position: Material is level, and both kings are castled behind intact pawn shields. White's d5-pawn cramps Black, while Black's knight on e5 attacks the bishop on c4 and the bishop on b6 attacks the bishop on e3; ...Nf3+ is a tactical check that also hits the rook on e1.
Candidates: f5, Bxe3, Nf3+, Nxc4
- f5 Bxb6 f4 f3... | Bxe3 | true | 1 | [{"cost": 0.002072425, "seconds": 27.71, "reasoning_tokens": 3015, "flags": [], "critic_cost": 0.00394849, "critic_tool_calls": 4, "false_claims": [{"quote": "making White play Kh1", "why": "Kh1 is not forced after ...Qg5; White has other legal moves, such as Qf1."}, {"quote": "making White play Kh1", "why": "Kh1 is no... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.009945 | false | null | null | null |
lichess:zqWPYCKC#ply47 | lichess:zqWPYCKC | games | 2r1k2r/b4pp1/4p1p1/3p4/1p1P2P1/5Q1P/PP3P2/2N1K2R b Kk - 0 24 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"f1c4",
"d7d5",
"e4d5",
"c6d5",
"c4b3",
"g8f6",
"h2h3",
"c8f5",
"g2g4",
"f5g6",
"g1f3",
"e7e6",
"c2c3",
"f8c5",
"b3c2",
"a7a5",
"c2g6",
"h7g6",
"d1e2",
"b8c6",
"d2d4",
"c5a7",
"f3g1",
"d8c7",
"e2f3",
"f6e4",
"b1d2",
"e4g5",
"f3e2",
"a8c8"... | false | black | middlegame | [
{
"move": "Rxc1+",
"line": "Rxc1+ Kd2 Rc4 Rc1",
"score": "+0.12"
},
{
"move": "O-O",
"line": "O-O O-O Bxd4 Qb3",
"score": "-5.66"
},
{
"move": "Rxh3",
"line": "Rxh3 Qxh3 Rxc1+ Kd2",
"score": "-7.56"
}
] | Rxc1+ | c8c1 | c8c1 | Rxc1+ | false | {"position":{"side_to_move":"black","move_number":24,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O"],"black":["O-O"]},"en_passant_square":null,"recent_moves":"bxc3 Bxc3 Nb4 Bxb4 axb4 Rc1 Qxc1+ Nxc1","opening":"B10 Caro-Kann Defense: Hillbilly Attack","material":{"white":{"queen":1,"rook":1,"kni... | {"position": "White has a queen, rook and knight against Black's two rooks and bishop, with six pawns each. Both kings are uncastled; Black's c8 rook attacks White's knight on c1, the bishop on a7 attacks d4, and White's queen targets d5 and f7.", "notes": {"Rxc1+": "Black takes White's knight with check; White answers... | Position: White has a queen, rook and knight against Black's two rooks and bishop, with six pawns each. Both kings are uncastled; Black's c8 rook attacks White's knight on c1, the bishop on a7 attacks d4, and White's queen targets d5 and f7.
Candidates: Rxc1+, O-O, Rxh3
- Rxc1+ Kd2 Rc4 Rc1: +0.12
Black takes White's ... | FEN: 2r1k2r/b4pp1/4p1p1/3p4/1p1P2P1/5Q1P/PP3P2/2N1K2R b Kk - 0 24
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White has a queen, rook and knight against Black's two rooks and bishop, with six pawns each. Both kings are uncastled; Black's c8 rook attacks White's knight on c1, the bishop on a7 attacks d4, and White's queen targets d5 and f7.
Candidates: Rxc1+, O-O, Rxh3
- Rxc1+ Kd2 Rc4 Rc1: +0.12
Black takes White's ... | Rxc1+ | true | 0 | [{"cost": 0.002243175, "seconds": 33.54, "reasoning_tokens": 3545, "flags": [], "critic_cost": 0.0034869099999999997, "critic_tool_calls": 4, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00573 | false | null | null | null |
lichess:yXeujJ9S#ply39 | lichess:yXeujJ9S | games | r3r1k1/p2n1p1p/b4qp1/3n4/1pN1pPP1/1P1pP2P/P2P2B1/2RQK1NR b K f3 0 20 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"c2c4",
"g8f6",
"b2b3",
"g7g6",
"c1b2",
"f8g7",
"b1c3",
"e8g8",
"e2e3",
"c7c6",
"g1f3",
"d7d5",
"f1e2",
"f8e8",
"h2h3",
"e7e5",
"g2g4",
"d5d4",
"c3a4",
"d4d3",
"e2f1",
"e5e4",
"f3g1",
"b7b5",
"c4b5",
"c6b5",
"a4c3",
"f6d5",
"f1g2",
"b5b4",
"c3a4",
"g7b2"... | false | black | middlegame | [
{
"move": "Bxc4",
"line": "Bxc4 Rxc4 Rac8 Rxc8",
"score": "+3.50"
},
{
"move": "Qh4+",
"line": "Qh4+ Kf1 Rac8 g5",
"score": "+5.19"
},
{
"move": "Nxf4",
"line": "Nxf4 exf4 Qxf4 g5",
"score": "+6.26"
}
] | Nxf4 | d5f4 | d5f4 | Nxf4 | false | {"position":{"side_to_move":"black","move_number":20,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O"],"black":[]},"en_passant_square":"f3","recent_moves":"Bxb2 Nxb2 Qf6 Nc4 Ba6 Rc1 Nd7 f4","opening":"A15 English Opening: Anglo-Indian Defense","material":{"white":{"queen":1,"rook":2,"bishop":1,"k... | {"position": "Material is level, but White's king remains on e1 with the f- and g-pawns advanced; Black's queen and knight on d5 attack f4, while the bishop on a6 attacks White's knight on c4. The c-file is open, and ...Qh4+ is an immediate check.", "notes": {"Bxc4": "Bxc4 removes White's knight, but Rxc4 takes the bis... | Position: Material is level, but White's king remains on e1 with the f- and g-pawns advanced; Black's queen and knight on d5 attack f4, while the bishop on a6 attacks White's knight on c4. The c-file is open, and ...Qh4+ is an immediate check.
Candidates: Bxc4, Qh4+, Nxf4
- Bxc4 Rxc4 Rac8 Rxc8: +3.50
Bxc4 removes Whi... | FEN: r3r1k1/p2n1p1p/b4qp1/3n4/1pN1pPP1/1P1pP2P/P2P2B1/2RQK1NR b K f3 0 20
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level, but White's king remains on e1 with the f- and g-pawns advanced; Black's queen and knight on d5 attack f4, while the bishop on a6 attacks White's knight on c4. The c-file is open, and ...Qh4+ is an immediate check.
Candidates: Bxc4, Qh4+, Nxf4
- Bxc4 Rxc4 Rac8 Rxc8: +3.50
Bxc4 removes Whi... | Nxf4 | true | 0 | [{"cost": 0.002775175, "seconds": 39.95, "reasoning_tokens": 4476, "flags": [], "critic_cost": 0.003563105, "critic_tool_calls": 4, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006338 | false | null | null | null |
lichess:XwaD8R5W#ply31 | lichess:XwaD8R5W | games | r2q1rk1/1pp2pb1/p2p1nb1/3P2B1/2PnPR2/P1NB4/1P4PP/R2Q2K1 b - - 0 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"g1f3",
"d7d6",
"c1f4",
"g7g6",
"c2c4",
"f8g7",
"e2e3",
"h7h6",
"b1c3",
"b8c6",
"f1e2",
"e8g8",
"a2a3",
"a7a6",
"e1g1",
"g6g5",
"f3g5",
"h6g5",
"f4g5",
"c8f5",
"e2d3",
"f5g6",
"e3e4",
"e7e5",
"d4d5",
"c6d4",
"f2f4",
"e5f4",
"f1f4"
] | false | black | middlegame | [
{
"move": "Bh5",
"line": "Bh5 Qf1 Nb3 Re1",
"score": "-1.24"
},
{
"move": "b5",
"line": "b5 Kh1 bxc4 Bxc4",
"score": "-0.80"
},
{
"move": "Nxe4",
"line": "Nxe4 Bxd8 Bh6 Bxe4",
"score": "-6.96"
}
] | b5 | b7b5 | b7b5 | b5 | false | {"position":{"side_to_move":"black","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Bg6 e4 e5 d5 Nd4 f4 exf4 Rxf4","opening":"A46 Indian Defense: Wade-Tartakower Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight"... | {"position": "Black has an extra knight against White's two extra pawns, leaving Black slightly ahead materially. White's rook on f4 and bishop on g5 both pressure the knight on f6, while Black's knight on d4 is active and threatens checks with ...Ne2+ or ...Nf3+.", "notes": {"Bh5": "...Bh5 attacks White's queen on d1;... | Position: Black has an extra knight against White's two extra pawns, leaving Black slightly ahead materially. White's rook on f4 and bishop on g5 both pressure the knight on f6, while Black's knight on d4 is active and threatens checks with ...Ne2+ or ...Nf3+.
Candidates: Bh5, b5, Nxe4
- Bh5 Qf1 Nb3 Re1: -1.24
...Bh5... | FEN: r2q1rk1/1pp2pb1/p2p1nb1/3P2B1/2PnPR2/P1NB4/1P4PP/R2Q2K1 b - - 0 16
Side to move: black
Recent moves: 12... Bg6 13. e4 e5 14. d5 Nd4 15. f4 exf4 16. Rxf4
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the hi... | Position: Black has an extra knight against White's two extra pawns, leaving Black slightly ahead materially. White's rook on f4 and bishop on g5 both pressure the knight on f6, while Black's knight on d4 is active and threatens checks with ...Ne2+ or ...Nf3+.
Candidates: Bh5, b5, Nxe4
- Bh5 Qf1 Nb3 Re1: -1.24
...Bh5... | b5 | true | 1 | [{"cost": 0.003142425, "seconds": 48.18, "reasoning_tokens": 5249, "flags": [], "critic_cost": 0.00427977, "critic_tool_calls": 1, "false_claims": [{"quote": "leaving Black down the queen and knight in the shown line", "why": "The continuation includes ...Bxf4, which captures White’s rook on f4. After that capture, Whi... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.010737 | false | null | null | null |
lichess:jTxkK6RR#ply18 | lichess:jTxkK6RR | games | r3k1nr/ppp2ppp/2n1b3/4P3/4p3/2N5/PPP1BPPP/R1BK3R w kq - 5 10 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"d7d5",
"f3e5",
"f8d6",
"d2d4",
"d5e4",
"f1c4",
"d6e5",
"d4e5",
"d8d1",
"e1d1",
"c8g4",
"c4e2",
"g4e6",
"b1c3",
"b8c6"
] | false | white | middlegame | [
{
"move": "Nxe4",
"line": "Nxe4 O-O-O+ Bd2 Nxe5",
"score": "-0.05"
},
{
"move": "Bd2",
"line": "Bd2 Nxe5 Nxe4 O-O-O",
"score": "-0.07"
}
] | Nxe4 | c3e4 | d1e1 | Ke1 | true | {"position":{"side_to_move":"white","move_number":10,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"dxe5 Qxd1+ Kxd1 Bg4+ Be2 Be6 Nc3 Nc6","opening":"C40 Elephant Gambit","material":{"white":{"rook":2,"bishop":2,"knight":1,"pawn":7,"p... | {"position": "Material is level: White has the bishop pair against Black’s extra knight, and both sides have seven pawns. Both kings are uncastled; the d-file is open beside White’s king on d1, Black threatens Nxe5, and White can take Black’s loose e4-pawn with the knight on c3.", "notes": {"Nxe4": "White’s knight take... | Position: Material is level: White has the bishop pair against Black’s extra knight, and both sides have seven pawns. Both kings are uncastled; the d-file is open beside White’s king on d1, Black threatens Nxe5, and White can take Black’s loose e4-pawn with the knight on c3.
Candidates: Nxe4, Bd2
- Nxe4 O-O-O+ Bd2 Nxe5... | FEN: r3k1nr/ppp2ppp/2n1b3/4P3/4p3/2N5/PPP1BPPP/R1BK3R w kq - 5 10
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: Material is level: White has the bishop pair against Black’s extra knight, and both sides have seven pawns. Both kings are uncastled; the d-file is open beside White’s king on d1, Black threatens Nxe5, and White can take Black’s loose e4-pawn with the knight on c3.
Candidates: Nxe4, Bd2
- Nxe4 O-O-O+ Bd2 Nxe5... | Nxe4 | true | 0 | [{"cost": 0.000882175, "seconds": 11.31, "reasoning_tokens": 878, "flags": [], "critic_cost": 0.001474475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.002356 | false | null | null | null |
lichess:fBfYeMgP#ply8 | lichess:fBfYeMgP | games | r1bqkb1r/pp2pppp/2n2n2/2pp4/2P5/2N1PN2/PP1P1PPP/R1BQKB1R w KQkq - 0 5 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"c2c4",
"c7c5",
"b1c3",
"g8f6",
"e2e3",
"b8c6",
"g1f3",
"d7d5"
] | false | white | opening | [
{
"move": "cxd5",
"line": "cxd5 Nxd5 Bc4 e6",
"score": "+0.23"
},
{
"move": "Nxd5",
"line": "Nxd5 Nxd5 cxd5 Qxd5",
"score": "+0.17"
},
{
"move": "Bd3",
"line": "Bd3 Nb4 Bb1 dxc4",
"score": "-0.55"
}
] | cxd5 | c4d5 | d2d4 | d4 | true | {"position":{"side_to_move":"white","move_number":5,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"c4 c5 Nc3 Nf6 e3 Nc6 Nf3 d5","opening":"A34 English Opening: Symmetrical Variation, Normal Variation","material":{"white":{"... | {"position": "Material is level, with both sides holding two rooks, two bishops, two knights and eight pawns. White's c4-pawn and c3-knight both attack Black's d5-pawn, which can capture on c4; both kings are uncastled and both bishops remain undeveloped.", "notes": {"cxd5": "White takes the d5-pawn, but ...Nxd5 recapt... | Position: Material is level, with both sides holding two rooks, two bishops, two knights and eight pawns. White's c4-pawn and c3-knight both attack Black's d5-pawn, which can capture on c4; both kings are uncastled and both bishops remain undeveloped.
Candidates: cxd5, Nxd5, Bd3
- cxd5 Nxd5 Bc4 e6: +0.23
White takes ... | FEN: r1bqkb1r/pp2pppp/2n2n2/2pp4/2P5/2N1PN2/PP1P1PPP/R1BQKB1R w KQkq - 0 5
Side to move: white
Recent moves: 3. e3 Nc6 4. Nf3 d5
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Th... | Position: Material is level, with both sides holding two rooks, two bishops, two knights and eight pawns. White's c4-pawn and c3-knight both attack Black's d5-pawn, which can capture on c4; both kings are uncastled and both bishops remain undeveloped.
Candidates: cxd5, Nxd5, Bd3
- cxd5 Nxd5 Bc4 e6: +0.23
White takes ... | cxd5 | true | 0 | [{"cost": 0.0014983, "seconds": 19.91, "reasoning_tokens": 1985, "flags": [], "critic_cost": 0.002151985, "critic_tool_calls": 4, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00365 | false | null | null | null |
lichess:Z2F3aXsU#ply27 | lichess:Z2F3aXsU | games | r2q1rk1/1p2npbp/3p1np1/1P2pb2/8/1Q1PPN2/1B1NBPPP/R4RK1 b - - 0 14 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"b2b4",
"e7e5",
"c1b2",
"d7d6",
"g1f3",
"c8f5",
"d2d3",
"g7g6",
"e2e3",
"f8g7",
"f1e2",
"g8f6",
"e1g1",
"e8g8",
"b1d2",
"b8c6",
"b4b5",
"c6e7",
"c2c4",
"c7c6",
"a2a4",
"c6b5",
"a4b5",
"a7a6",
"d1b3",
"a6b5",
"c4b5"
] | false | black | middlegame | [
{
"move": "Bxd3",
"line": "Bxd3 Bxd3 Nd7 Rxa8",
"score": "-6.35"
},
{
"move": "Rc8",
"line": "Rc8 Nc4 e4 dxe4",
"score": "-0.50"
},
{
"move": "Qd7",
"line": "Qd7 Nc4 Be6 Ng5",
"score": "-0.56"
},
{
"move": "Rxa1",
"line": "Rxa1 Rxa1 Be6 Nc4",
"score": "-0.... | Rxa1 | a8a1 | a8a1 | Rxa1 | false | {"position":{"side_to_move":"black","move_number":14,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"c6 a4 cxb5 axb5 a6 Qb3 axb5 cxb5","opening":"A00 Polish Opening: Czech Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"paw... | {"position": "Material is even, with both sides holding two rooks, two bishops, two knights, and six pawns. White's queen on b3 pins f7, while Black's bishop on f5 attacks d3; both b-pawns are isolated, d6 is backward, and the rooks face each other on the open a-file.", "notes": {"Bxd3": "Bxd3 takes the attacked pawn, ... | Position: Material is even, with both sides holding two rooks, two bishops, two knights, and six pawns. White's queen on b3 pins f7, while Black's bishop on f5 attacks d3; both b-pawns are isolated, d6 is backward, and the rooks face each other on the open a-file.
Candidates: Bxd3, Rc8, Qd7, Rxa1
- Bxd3 Bxd3 Nd7 Rxa8: ... | FEN: r2q1rk1/1p2npbp/3p1np1/1P2pb2/8/1Q1PPN2/1B1NBPPP/R4RK1 b - - 0 14
Side to move: black
Board:
8 r . . q . r k .
7 . p . . n p b p
6 . . . p . n p .
5 . P . . p b . .
4 . . . . . . . .
3 . Q . P P N . .
2 . B . N B P P P
1 R . . . . R K .
a b c d e f g h
Find the best move for black. Think first: list candidate mo... | Position: Material is even, with both sides holding two rooks, two bishops, two knights, and six pawns. White's queen on b3 pins f7, while Black's bishop on f5 attacks d3; both b-pawns are isolated, d6 is backward, and the rooks face each other on the open a-file.
Candidates: Bxd3, Rc8, Qd7, Rxa1
- Bxd3 Bxd3 Nd7 Rxa8: ... | Rxa1 | true | 1 | [{"cost": 0.003558175, "seconds": 51.53, "reasoning_tokens": 5968, "flags": ["move not on the shown lines: Bxg7", "move not on the shown lines: Kxg7", "move not on the shown lines: Qb2+", "move not on the shown lines: Kg8", "move not on the shown lines: Bf3"]}, {"cost": 0.001365125, "seconds": 20.82, "reasoning_tokens"... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00849 | false | null | null | null |
lichess:fm4vfy8l#ply10 | lichess:fm4vfy8l | games | rn1qkb1r/pppb1ppp/5n2/1B1P4/8/8/PP1P1PPP/RNBQK1NR w KQkq - 3 6 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"c2c4",
"d7d5",
"c4d5",
"e6d5",
"e4d5",
"g8f6",
"f1b5",
"c8d7"
] | false | white | opening | [
{
"move": "Bxd7+",
"line": "Bxd7+ Nbxd7 Nc3 Nb6",
"score": "-0.32"
},
{
"move": "Qe2+",
"line": "Qe2+ Be7 Nf3 Nxd5",
"score": "-0.27"
}
] | Qe2+ | d1e2 | b5c4 | Bc4 | true | {"position":{"side_to_move":"white","move_number":6,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"c4 d5 cxd5 exd5 exd5 Nf6 Bb5+ Bd7","opening":"C00 French Defense: Steiner Variation","material":{"white":{"queen":1,"rook":2... | {"position": "White is a pawn up, but the isolated pawn on d5 is attacked by Black's knight on f6, and White also has doubled d-pawns. White's bishop on b5 attacks the pinned black bishop on d7, which can take it in return; both kings are uncastled, and Black threatens ...Nxd5 as well as ...Bxb5.", "notes": {"Bxd7+": "... | Position: White is a pawn up, but the isolated pawn on d5 is attacked by Black's knight on f6, and White also has doubled d-pawns. White's bishop on b5 attacks the pinned black bishop on d7, which can take it in return; both kings are uncastled, and Black threatens ...Nxd5 as well as ...Bxb5.
Candidates: Bxd7+, Qe2+
- ... | FEN: rn1qkb1r/pppb1ppp/5n2/1B1P4/8/8/PP1P1PPP/RNBQK1NR w KQkq - 3 6
Side to move: white
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is a pawn up, but the isolated pawn on d5 is attacked by Black's knight on f6, and White also has doubled d-pawns. White's bishop on b5 attacks the pinned black bishop on d7, which can take it in return; both kings are uncastled, and Black threatens ...Nxd5 as well as ...Bxb5.
Candidates: Bxd7+, Qe2+
- ... | Qe2+ | true | 1 | [{"cost": 0.001428175, "seconds": 22.05, "reasoning_tokens": 1944, "flags": [], "critic_cost": 0.002438895, "critic_tool_calls": 1, "false_claims": [{"quote": "Qe2+ draws ...Be7", "why": "After Qe2+, Black also has the legal replies ...Ne4 and ...Qe7, so ...Be7 is not forced."}]}, {"cost": 0.000416145, "seconds": 8.25,... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006364 | false | null | null | null |
lichess:AkwRMVAc#ply28 | lichess:AkwRMVAc | games | r2q1rk1/pbp1b1pp/1p2pp2/n3N3/3P1B2/2QBPP2/PP4PP/R4RK1 w - - 0 15 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"d7d5",
"c1f4",
"c8f5",
"e2e3",
"e7e6",
"c2c4",
"d5c4",
"f1c4",
"g8f6",
"d1b3",
"b7b6",
"b1c3",
"f8e7",
"g1f3",
"e8g8",
"e1g1",
"f6e4",
"c3e4",
"f5e4",
"f3e5",
"b8c6",
"f2f3",
"c6a5",
"b3c3",
"e4b7",
"c4d3",
"f7f6"
] | false | white | middlegame | [
{
"move": "Nc4",
"line": "Nc4 c5 dxc5 Bxc5",
"score": "+1.10"
},
{
"move": "Bxh7+",
"line": "Bxh7+ Kxh7 Qc2+ Kg8",
"score": "-3.92"
},
{
"move": "Ng4",
"line": "Ng4 c5 dxc5 Bxc5",
"score": "+0.26"
}
] | Nc4 | e5c4 | e5c4 | Nc4 | false | {"position":{"side_to_move":"white","move_number":15,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Ne5 Nc6 f3 Na5 Qc3 Bb7 Bd3 f6","opening":"D00 Queen's Pawn Game: Accelerated London System","material":{"white":{"queen":1,"rook":2,"bishop":2,"kn... | {"position": "Material is even, and both sides have the bishop pair and castled kings with intact pawn shields. Black threatens ...fxe5 against White's knight on e5; White's queen eyes Black's knight on a5 and pawn on c7, while ...c5 can hit d4.", "notes": {"Nc4": "Nc4 escapes ...fxe5 and attacks the knight on a5; afte... | Position: Material is even, and both sides have the bishop pair and castled kings with intact pawn shields. Black threatens ...fxe5 against White's knight on e5; White's queen eyes Black's knight on a5 and pawn on c7, while ...c5 can hit d4.
Candidates: Nc4, Bxh7+, Ng4
- Nc4 c5 dxc5 Bxc5: +1.10
Nc4 escapes ...fxe5 an... | FEN: r2q1rk1/pbp1b1pp/1p2pp2/n3N3/3P1B2/2QBPP2/PP4PP/R4RK1 w - - 0 15
Side to move: white
Recent moves: 13. Qc3 Bb7 14. Bd3 f6
Board:
8 r . . q . r k .
7 p b p . b . p p
6 . p . . p p . .
5 n . . . N . . .
4 . . . P . B . .
3 . . Q B P P . .
2 P P . . . . P P
1 R . . . . R K .
a b c d e f g h
Find the best move for w... | Position: Material is even, and both sides have the bishop pair and castled kings with intact pawn shields. Black threatens ...fxe5 against White's knight on e5; White's queen eyes Black's knight on a5 and pawn on c7, while ...c5 can hit d4.
Candidates: Nc4, Bxh7+, Ng4
- Nc4 c5 dxc5 Bxc5: +1.10
Nc4 escapes ...fxe5 an... | Nc4 | true | 1 | [{"cost": 0.002248675, "seconds": 32.45, "reasoning_tokens": 3457, "flags": ["move not on the shown lines: bxa5"]}, {"cost": 0.000309475, "seconds": 3.98, "reasoning_tokens": 185, "flags": [], "critic_cost": 0.0024700800000000004, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005028 | false | null | null | null |
lichess:WHkUbNWU#ply21 | lichess:WHkUbNWU | games | rnb1kb1r/pp1ppppp/8/2pqP3/2B5/5NP1/PPPN1PP1/R1Q1K2R b KQkq - 1 11 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"c1f4",
"f6d5",
"f4g3",
"c7c5",
"e2e4",
"d5f6",
"e4e5",
"f6e4",
"d4d5",
"d8b6",
"d1c1",
"e4g3",
"h2g3",
"b6b4",
"b1d2",
"b4d4",
"g1f3",
"d4d5",
"f1c4"
] | false | black | opening | [
{
"move": "Qc6",
"line": "Qc6 Ng5 f6 Nf7",
"score": "-2.60"
},
{
"move": "Qxd2+",
"line": "Qxd2+ Qxd2 e6 g4",
"score": "-8.73"
},
{
"move": "Qxc4",
"line": "Qxc4 Nxc4 b5 Na3",
"score": "-8.51"
},
{
"move": "Qe6",
"line": "Qe6 Bxe6 fxe6 Ne4",
"score": "-8.5... | Qc6 | d5c6 | d5c6 | Qc6 | false | {"position":{"side_to_move":"black","move_number":11,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"Nxg3 hxg3 Qb4+ Nd2 Qd4 Ngf3 Qxd5 Bc4","opening":"A45 Indian Defense: Accelerated London System","material":{"white":{"queen... | {"position": "Black is a pawn up and has the bishop pair against White's two knights and bishop; White's g-pawns are doubled. Both kings remain uncastled, and Black's queen on d5 is attacked by White's bishop on c4 while targeting White's knights on d2 and f3.", "notes": {"Qc6": "Qc6 moves the queen out of the bishop's... | Position: Black is a pawn up and has the bishop pair against White's two knights and bishop; White's g-pawns are doubled. Both kings remain uncastled, and Black's queen on d5 is attacked by White's bishop on c4 while targeting White's knights on d2 and f3.
Candidates: Qc6, Qxd2+, Qxc4, Qe6
- Qc6 Ng5 f6 Nf7: -2.60
Qc6... | FEN: rnb1kb1r/pp1ppppp/8/2pqP3/2B5/5NP1/PPPN1PP1/R1Q1K2R b KQkq - 1 11
Side to move: black
Recent moves: 9... Qd4 10. Ngf3 Qxd5 11. Bc4
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as B... | Position: Black is a pawn up and has the bishop pair against White's two knights and bishop; White's g-pawns are doubled. Both kings remain uncastled, and Black's queen on d5 is attacked by White's bishop on c4 while targeting White's knights on d2 and f3.
Candidates: Qc6, Qxd2+, Qxc4, Qe6
- Qc6 Ng5 f6 Nf7: -2.60
Qc6... | Qc6 | true | 0 | [{"cost": 0.001685925, "seconds": 23.55, "reasoning_tokens": 2224, "flags": [], "critic_cost": 0.0035232300000000005, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005209 | true | anthropic/claude-sonnet-5.5 | true | [] |
lichess:axBapFA2#ply9 | lichess:axBapFA2 | games | r1b1kbnr/pppp1ppp/2n2q2/8/2B1Pp2/5N2/PPPP2PP/RNBQ1RK1 b kq - 1 5 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"f2f4",
"b8c6",
"g1f3",
"d8f6",
"f1c4",
"e5f4",
"e1g1"
] | false | black | opening | [
{
"move": "Qd4+",
"line": "Qd4+ Nxd4 Nxd4 Bxf7+",
"score": "-8.51"
},
{
"move": "d6",
"line": "d6 Nc3 Be6 Nd5",
"score": "-0.58"
},
{
"move": "Bc5+",
"line": "Bc5+ Kh1 Nge7 Nc3",
"score": "-0.32"
}
] | Bc5+ | f8c5 | f8c5 | Bc5+ | false | {"position":{"side_to_move":"black","move_number":5,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"e5 f4 Nc6 Nf3 Qf6 Bc4 exf4 O-O","opening":"C30 King's Gambit Declined: Queen's Knight Defense","material":{"white":{"queen":1,"rook":2,"b... | {"position": "Black is a pawn up, with the f-pawn advanced to f4 and the queen active on f6, but the king remains on e8 and the c8 bishop and g8 knight are undeveloped. White has castled, and White's bishop on c4 eyes f7 while Black's queen targets b2.", "notes": {"Qd4+": "Qd4+ checks and attacks the bishop on c4, but ... | Position: Black is a pawn up, with the f-pawn advanced to f4 and the queen active on f6, but the king remains on e8 and the c8 bishop and g8 knight are undeveloped. White has castled, and White's bishop on c4 eyes f7 while Black's queen targets b2.
Candidates: Qd4+, d6, Bc5+
- Qd4+ Nxd4 Nxd4 Bxf7+: -8.51
Qd4+ checks ... | FEN: r1b1kbnr/pppp1ppp/2n2q2/8/2B1Pp2/5N2/PPPP2PP/RNBQ1RK1 b kq - 1 5
Side to move: black
Recent moves: 3... Qf6 4. Bc4 exf4 5. O-O
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best.... | Position: Black is a pawn up, with the f-pawn advanced to f4 and the queen active on f6, but the king remains on e8 and the c8 bishop and g8 knight are undeveloped. White has castled, and White's bishop on c4 eyes f7 while Black's queen targets b2.
Candidates: Qd4+, d6, Bc5+
- Qd4+ Nxd4 Nxd4 Bxf7+: -8.51
Qd4+ checks ... | Bc5+ | true | 3 | [{"cost": 0.0029833, "seconds": 45.36, "reasoning_tokens": 4893, "flags": [], "critic_cost": 0.0069004949999999995, "critic_tool_calls": 4, "false_claims": [{"quote": "d6 reinforces e5", "why": "Black has no pawn on e5: its e-pawn was captured on f4. The d6 pawn controls e5, but does not reinforce an e5 pawn."}, {"quot... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.019791 | false | null | null | null |
lichess:nl8PlX8r#ply19 | lichess:nl8PlX8r | games | r1b4r/ppppqk1p/2n3p1/2Q5/3pP3/8/PPPN1PPP/R1B1K2R b KQ - 2 10 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"d2d4",
"e5d4",
"f1c4",
"f8c5",
"f3g5",
"g8h6",
"g5f7",
"h6f7",
"c4f7",
"e8f7",
"d1h5",
"g7g6",
"h5c5",
"d8e7",
"b1d2"
] | false | black | middlegame | [
{
"move": "Qxe4+",
"line": "Qxe4+ Nxe4 Re8 O-O",
"score": "-8.87"
},
{
"move": "Qxc5",
"line": "Qxc5 Kd1 Qf8 Nc4",
"score": "+9.25"
},
{
"move": "Re8",
"line": "Re8 Qd5+ Qe6 Qxe6+",
"score": "+0.11"
}
] | Qxc5 | e7c5 | e7c5 | Qxc5 | false | {"position":{"side_to_move":"black","move_number":10,"phase":"middlegame","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Nxf7 Bxf7+ Kxf7 Qh5+ g6 Qxc5 Qe7 Nd2","opening":"C44 Scotch Game: Scotch Gambit, Sarratt Variation","material":{"white":{"queen":1,"r... | {"position": "Material is level, but the queens face off: Black's queen on e7 attacks White's queen on c5, while White's queen attacks it back. Black's king is exposed on f7 and White's king is uncastled on e1; ...Qxe4+ looks tempting, but White's knight on d2 can take the queen.", "notes": {"Qxe4+": "Black takes White... | Position: Material is level, but the queens face off: Black's queen on e7 attacks White's queen on c5, while White's queen attacks it back. Black's king is exposed on f7 and White's king is uncastled on e1; ...Qxe4+ looks tempting, but White's knight on d2 can take the queen.
Candidates: Qxe4+, Qxc5, Re8
- Qxe4+ Nxe4 R... | FEN: r1b4r/ppppqk1p/2n3p1/2Q5/3pP3/8/PPPN1PPP/R1B1K2R b KQ - 2 10
Side to move: black
Legal moves: Ke6, Ke8, Kf6, Kf8, Kg7, Kg8, Na5, Nb4, Nb8, Nd8, Ne5, Qd6, Qd8, Qe5, Qe6, Qe8, Qf6, Qf8, Qg5, Qh4, Qxc5, Qxe4+, Rb8, Rd8, Re8, Rf8, Rg8, a5, a6, b5, b6, d3, d5, d6, g5, h5, h6
Find the best move for black. Think first: l... | Position: Material is level, but the queens face off: Black's queen on e7 attacks White's queen on c5, while White's queen attacks it back. Black's king is exposed on f7 and White's king is uncastled on e1; ...Qxe4+ looks tempting, but White's knight on d2 can take the queen.
Candidates: Qxe4+, Qxc5, Re8
- Qxe4+ Nxe4 R... | Qxc5 | true | 0 | [{"cost": 0.0017303, "seconds": 25.06, "reasoning_tokens": 2511, "flags": [], "critic_cost": 0.0021915299999999997, "critic_tool_calls": 4, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003922 | false | null | null | null |
lichess:SvHF6L8H#ply51 | lichess:SvHF6L8H | games | 1q2r1k1/R1p2pp1/3n1b1p/2Np4/3P4/1PP3P1/Q4PBP/6K1 b - - 2 26 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"g1f3",
"d7d5",
"d2d4",
"b7b5",
"a2a4",
"c8d7",
"a4b5",
"d7b5",
"b1c3",
"b5c6",
"f3e5",
"c6b7",
"g2g3",
"b8c6",
"f1g2",
"g8f6",
"e1g1",
"e7e6",
"c1g5",
"f8e7",
"e2e3",
"e8g8",
"e5d3",
"h7h6",
"g5f6",
"e7f6",
"d3c5",
"a8b8",
"c5b7",
"b8b7",
"b2b3",
"c6e7"... | false | black | middlegame | [
{
"move": "Re1+",
"line": "Re1+ Bf1 Qb5 Ra8+",
"score": "-1.91"
},
{
"move": "Qxa7",
"line": "Qxa7 Qxa7 Nb5 Qa1",
"score": "-6.66"
},
{
"move": "Nb5",
"line": "Nb5 Rb7 Re1+ Bf1",
"score": "-1.60"
}
] | Nb5 | d6b5 | d6b5 | Nb5 | false | {"position":{"side_to_move":"black","move_number":26,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Re8 Rfa1 Nd6 Rxa7 Rxa7 Rxa7 Qb8 Qa2","opening":"D02 Queen's Pawn Game: Zukertort Variation","material":{"white":{"queen":1,"rook":1,"bishop":1,"kn... | {"position": "White is up a pawn, with an active rook on the seventh rank and a knight on c5; both kings have pawn cover. Black's queen on b8 attacks the rook on a7, while White threatens Bxd5 against Black's loose pawn, and the open a- and e-files give the rooks activity.", "notes": {"Re1+": "...Re1+ checks White's ki... | Position: White is up a pawn, with an active rook on the seventh rank and a knight on c5; both kings have pawn cover. Black's queen on b8 attacks the rook on a7, while White threatens Bxd5 against Black's loose pawn, and the open a- and e-files give the rooks activity.
Candidates: Re1+, Qxa7, Nb5
- Re1+ Bf1 Qb5 Ra8+: -... | FEN: 1q2r1k1/R1p2pp1/3n1b1p/2Np4/3P4/1PP3P1/Q4PBP/6K1 b - - 2 26
Side to move: black
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then answer with that move in SAN. | Position: White is up a pawn, with an active rook on the seventh rank and a knight on c5; both kings have pawn cover. Black's queen on b8 attacks the rook on a7, while White threatens Bxd5 against Black's loose pawn, and the open a- and e-files give the rooks activity.
Candidates: Re1+, Qxa7, Nb5
- Re1+ Bf1 Qb5 Ra8+: -... | Nb5 | true | 0 | [{"cost": 0.002180425, "seconds": 33.13, "reasoning_tokens": 3350, "flags": [], "critic_cost": 0.005099855, "critic_tool_calls": 5, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00728 | false | null | null | null |
lichess:lxlSb3mz#ply14 | lichess:lxlSb3mz | games | r1bq3r/pppp1kpp/2n5/2b1P3/3p2n1/5N2/PPP2PPP/RNBQ1RK1 w - - 0 8 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"b8c6",
"f1c4",
"g8f6",
"d2d4",
"e5d4",
"e1g1",
"f8c5",
"e4e5",
"f6g4",
"c4f7",
"e8f7"
] | false | white | opening | [
{
"move": "Ng5+",
"line": "Ng5+ Kg8 Qxg4 d5",
"score": "-0.44"
},
{
"move": "h3",
"line": "h3 Nh6 c3 d5",
"score": "-1.96"
},
{
"move": "e6+",
"line": "e6+ Kg8 b4 Bxb4",
"score": "-5.05"
}
] | Ng5+ | f3g5 | f3g5 | Ng5+ | false | {"position":{"side_to_move":"white","move_number":8,"phase":"opening","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"d4 exd4 O-O Bc5 e5 Ng4 Bxf7+ Kxf7","opening":"C56 Italian Game: Scotch Gambit, Max Lange Attack, Spielmann Defense","material":{"white":{"queen":1,"ro... | {"position": "Black is a bishop up with equal pawns, but Black's king on f7 is exposed while White's king is safe on g1. White's e5 pawn is attacked by both black knights; White's queen on d1 and knight on f3 pressure the d4 pawn, defended by Black's bishop on c5 and knight on c6. Black threatens ...Ncxe5 and ...Ngxe5.... | Position: Black is a bishop up with equal pawns, but Black's king on f7 is exposed while White's king is safe on g1. White's e5 pawn is attacked by both black knights; White's queen on d1 and knight on f3 pressure the d4 pawn, defended by Black's bishop on c5 and knight on c6. Black threatens ...Ncxe5 and ...Ngxe5.
Can... | FEN: r1bq3r/pppp1kpp/2n5/2b1P3/3p2n1/5N2/PPP2PPP/RNBQ1RK1 w - - 0 8
Side to move: white
Recent moves: 4. d4 exd4 5. O-O Bc5 6. e5 Ng4 7. Bxf7+ Kxf7
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scor... | Position: Black is a bishop up with equal pawns, but Black's king on f7 is exposed while White's king is safe on g1. White's e5 pawn is attacked by both black knights; White's queen on d1 and knight on f3 pressure the d4 pawn, defended by Black's bishop on c5 and knight on c6. Black threatens ...Ncxe5 and ...Ngxe5.
Can... | Ng5+ | true | 2 | [{"cost": 0.0031373, "seconds": 49.64, "reasoning_tokens": 5178, "flags": ["move not on the shown lines: Nc6", "move not on the shown lines: Nc6"]}, {"cost": 0.000352905, "seconds": 4.15, "reasoning_tokens": 221, "flags": [], "critic_cost": 0.005130775, "critic_tool_calls": 4, "false_claims": [{"quote": "Black advances... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.012284 | false | null | null | null |
lichess:r4mjalMZ#ply31 | lichess:r4mjalMZ | games | 3qk2r/3pnppp/p3P3/1p6/3b1B2/1B6/PP2QPPP/2R3K1 b k - 0 16 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c5",
"d2d4",
"c5d4",
"c2c3",
"d4c3",
"g1f3",
"e7e6",
"f1c4",
"a7a6",
"b1c3",
"b7b5",
"c4b3",
"c8b7",
"d1e2",
"b8c6",
"e1g1",
"f8c5",
"c1f4",
"c6d4",
"f3d4",
"c5d4",
"c3d5",
"a8c8",
"a1c1",
"c8c1",
"f1c1",
"b7d5",
"e4d5",
"g8e7",
"d5e6"
] | false | black | middlegame | [
{
"move": "dxe6",
"line": "dxe6 Rd1 Qb6 Qd2",
"score": "-0.14"
},
{
"move": "Bxb2",
"line": "Bxb2 exf7+ Kf8 Qxb2",
"score": "-8.70"
},
{
"move": "fxe6",
"line": "fxe6 Rd1 Qb6 Qd2",
"score": "-0.24"
}
] | dxe6 | d7e6 | d7e6 | dxe6 | false | {"position":{"side_to_move":"black","move_number":16,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O"]},"en_passant_square":null,"recent_moves":"Rc8 Rac1 Rxc1 Rxc1 Bxd5 exd5 Ne7 dxe6","opening":"B21 Sicilian Defense: Smith-Morra Gambit Accepted, Danish Variation","material":{"white":{"... | {"position": "Material is level: White has two bishops against Black's bishop and knight, and White's pawn on e6 is under attack while Black's king remains on e8. Black's bishop on d4 attacks b2 and f2, while White threatens exf7+ and the rook on c1 occupies the open c-file.", "notes": {"dxe6": "dxe6 removes White's da... | Position: Material is level: White has two bishops against Black's bishop and knight, and White's pawn on e6 is under attack while Black's king remains on e8. Black's bishop on d4 attacks b2 and f2, while White threatens exf7+ and the rook on c1 occupies the open c-file.
Candidates: dxe6, Bxb2, fxe6
- dxe6 Rd1 Qb6 Qd2:... | FEN: 3qk2r/3pnppp/p3P3/1p6/3b1B2/1B6/PP2QPPP/2R3K1 b k - 0 16
Side to move: black
Recent moves: 14... Bxd5 15. exd5 Ne7 16. dxe6
Board:
8 . . . q k . . r
7 . . . p n p p p
6 p . . . P . . .
5 . p . . . . . .
4 . . . b . B . .
3 . B . . . . . .
2 P P . . Q P P P
1 . . R . . . K .
a b c d e f g h
Find the best move for... | Position: Material is level: White has two bishops against Black's bishop and knight, and White's pawn on e6 is under attack while Black's king remains on e8. Black's bishop on d4 attacks b2 and f2, while White threatens exf7+ and the rook on c1 occupies the open c-file.
Candidates: dxe6, Bxb2, fxe6
- dxe6 Rd1 Qb6 Qd2:... | dxe6 | true | 0 | [{"cost": 0.002087425, "seconds": 30.63, "reasoning_tokens": 3199, "flags": [], "critic_cost": 0.001652975, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00374 | false | null | null | null |
lichess:xLe9CvYI#ply35 | lichess:xLe9CvYI | games | 1k1r3r/pp1bqpb1/2p3pp/3P4/3PpNP1/4P3/PP1QBP2/2KR3R b - - 0 18 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"d2d4",
"g8f6",
"g1f3",
"g7g6",
"c1g5",
"d7d5",
"g5f6",
"e7f6",
"h2h4",
"f6f5",
"e2e3",
"f8g7",
"b1d2",
"b8d7",
"f1d3",
"d7f6",
"f3g5",
"h7h6",
"g5h3",
"f6e4",
"d2e4",
"f5e4",
"d3e2",
"d8h4",
"d1d2",
"h4e7",
"h3f4",
"c7c6",
"g2g4",
"c8d7",
"e1c1",
"e8c8"... | false | black | middlegame | [
{
"move": "Rc8",
"line": "Rc8 dxc6 Rxc6+ Kb1",
"score": "+0.50"
},
{
"move": "Bf6",
"line": "Bf6 Qa5 Bg5 dxc6",
"score": "+0.58"
},
{
"move": "c5",
"line": "c5 dxc5 Qxc5+ Kb1",
"score": "+1.82"
},
{
"move": "Bxd4",
"line": "Bxd4 Qxd4 cxd5 Kb1",
"score": "-... | c5 | c6c5 | c6c5 | c5 | false | {"position":{"side_to_move":"black","move_number":18,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"c6 g4 Bd7 O-O-O O-O-O c4 Kb8 cxd5","opening":"D03 Queen's Pawn Game: Torre Attack, Gr\u00fcnfeld Variation","material":{"white":{"queen":1,"rook":... | {"position": "Material is level: White has a bishop and knight against Black's bishop pair, with seven pawns each. Black's king on b8 is better shielded than White's king on c1; Black's bishops pressure d4 and g4, while White's d5-pawn can take c6 and White's knight on f4 eyes g6.", "notes": {"Rc8": "Rc8 backs the c6-p... | Position: Material is level: White has a bishop and knight against Black's bishop pair, with seven pawns each. Black's king on b8 is better shielded than White's king on c1; Black's bishops pressure d4 and g4, while White's d5-pawn can take c6 and White's knight on f4 eyes g6.
Candidates: Rc8, Bf6, c5, Bxd4
- Rc8 dxc6 ... | FEN: 1k1r3r/pp1bqpb1/2p3pp/3P4/3PpNP1/4P3/PP1QBP2/2KR3R b - - 0 18
Side to move: black
Recent moves: 14... c6 15. g4 Bd7 16. O-O-O O-O-O 17. c4 Kb8 18. cxd5
Find the best move for black. Think first: list candidate moves, give each a likely line and a score for black (pawns like +0.35, or #n for mate), and pick the hig... | Position: Material is level: White has a bishop and knight against Black's bishop pair, with seven pawns each. Black's king on b8 is better shielded than White's king on c1; Black's bishops pressure d4 and g4, while White's d5-pawn can take c6 and White's knight on f4 eyes g6.
Candidates: Rc8, Bf6, c5, Bxd4
- Rc8 dxc6 ... | c5 | true | 0 | [{"cost": 0.0024083, "seconds": 34.47, "reasoning_tokens": 3684, "flags": [], "critic_cost": 0.003003725, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005412 | false | null | null | null |
lichess:BXOzjr2t#ply29 | lichess:BXOzjr2t | games | 2r1kb1r/pp3pp1/2n1p1b1/3pPn1p/1q1P1P2/P1N1BN2/1P1QB1PP/R4RK1 b k - 0 15 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"c7c6",
"d2d4",
"d7d5",
"e4e5",
"c8f5",
"f2f4",
"e7e6",
"g1f3",
"h7h5",
"f1e2",
"c6c5",
"c2c3",
"b8c6",
"e1g1",
"g8e7",
"c1e3",
"c5d4",
"c3d4",
"d8b6",
"d1d2",
"f5g6",
"b1c3",
"e7f5",
"c3a4",
"b6b4",
"a4c3",
"a8c8",
"a2a3"
] | false | black | middlegame | [
{
"move": "Qb6",
"line": "Qb6 Bf2 Be7 b4",
"score": "-0.97"
},
{
"move": "Qa5",
"line": "Qa5 b4 Qd8 Bf2",
"score": "-1.10"
},
{
"move": "Qb3",
"line": "Qb3 Bf2 Na5 Bb5+",
"score": "-0.83"
},
{
"move": "Qxc3",
"line": "Qxc3 bxc3 Rc7 h3",
"score": "-7.11"
... | Qb3 | b4b3 | b4b3 | Qb3 | false | {"position":{"side_to_move":"black","move_number":15,"phase":"middlegame","in_check":false,"castling_rights":{"white":[],"black":["O-O"]},"en_passant_square":null,"recent_moves":"Bg6 Nc3 Nf5 Na4 Qb4 Nc3 Rc8 a3","opening":"B12 Caro-Kann Defense: Advance Variation","material":{"white":{"queen":1,"rook":2,"bishop":2,"knig... | {"position": "Material is even, with a queen, two rooks, two bishops, two knights and seven pawns each. White's king is safe on g1 while Black's king remains on e8; the centre is locked and Black's rook occupies the open c-file. White's a3-pawn attacks Black's queen on b4, while that queen attacks White's knight on c3 ... | Position: Material is even, with a queen, two rooks, two bishops, two knights and seven pawns each. White's king is safe on g1 while Black's king remains on e8; the centre is locked and Black's rook occupies the open c-file. White's a3-pawn attacks Black's queen on b4, while that queen attacks White's knight on c3 and ... | FEN: 2r1kb1r/pp3pp1/2n1p1b1/3pPn1p/1q1P1P2/P1N1BN2/1P1QB1PP/R4RK1 b k - 0 15
Side to move: black
Legal moves: Bc5, Bd6, Be7, Bh7, Kd7, Kd8, Ke7, Na5, Nb8, Nce7, Ncxd4, Nd6, Nd8, Nfe7, Nfxd4, Ng3, Nh4, Nh6, Nxe3, Nxe5, Qa4, Qa5, Qb3, Qb5, Qb6, Qc4, Qc5, Qd6, Qe7, Qxa3, Qxb2, Qxc3, Qxd4, Ra8, Rb8, Rc7, Rd8, Rg8, Rh6, Rh7... | Position: Material is even, with a queen, two rooks, two bishops, two knights and seven pawns each. White's king is safe on g1 while Black's king remains on e8; the centre is locked and Black's rook occupies the open c-file. White's a3-pawn attacks Black's queen on b4, while that queen attacks White's knight on c3 and ... | Qb3 | true | 0 | [{"cost": 0.003294175, "seconds": 48.36, "reasoning_tokens": 5408, "flags": [], "critic_cost": 0.0026685600000000004, "critic_tool_calls": 1, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.005963 | false | null | null | null |
lichess:IZMkV6Jd#ply13 | lichess:IZMkV6Jd | games | rnbqk2r/pp3ppp/2p2n2/3p4/1bPP4/1QN2N2/PP3PPP/R1B1KB1R b KQkq - 3 7 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e6",
"g1f3",
"d7d5",
"e4d5",
"e6d5",
"d2d4",
"g8f6",
"c2c4",
"c7c6",
"b1c3",
"f8b4",
"d1b3"
] | false | black | opening | [
{
"move": "Bxc3+",
"line": "Bxc3+ bxc3 O-O Bd3",
"score": "-0.09"
},
{
"move": "dxc4",
"line": "dxc4 Qxb4 b5 Bf4",
"score": "-6.53"
},
{
"move": "Qe7+",
"line": "Qe7+ Be3 O-O c5",
"score": "-0.17"
}
] | Bxc3+ | b4c3 | a7a5 | a5 | true | {"position":{"side_to_move":"black","move_number":7,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":["O-O","O-O-O"]},"en_passant_square":null,"recent_moves":"exd5 d4 Nf6 c4 c6 Nc3 Bb4 Qb3","opening":"C01 French Defense: Exchange Variation","material":{"white":{"queen":1,"rook":2,"b... | {"position": "Material is even, the e-file is open, and both kings remain uncastled; White has c4 and d4 against Black's c6 and d5. White's queen on b3 attacks Black's bishop on b4, making Qxb4 an immediate threat, while the bishop pins White's knight on c3.", "notes": {"Bxc3+": "...Bxc3+ removes White's pinned knight ... | Position: Material is even, the e-file is open, and both kings remain uncastled; White has c4 and d4 against Black's c6 and d5. White's queen on b3 attacks Black's bishop on b4, making Qxb4 an immediate threat, while the bishop pins White's knight on c3.
Candidates: Bxc3+, dxc4, Qe7+
- Bxc3+ bxc3 O-O Bd3: -0.09
...Bx... | FEN: rnbqk2r/pp3ppp/2p2n2/3p4/1bPP4/1QN2N2/PP3PPP/R1B1KB1R b KQkq - 3 7
Side to move: black
Recent moves: 3... exd5 4. d4 Nf6 5. c4 c6 6. Nc3 Bb4 7. Qb3
Board:
8 r n b q k . . r
7 p p . . . p p p
6 . . p . . n . .
5 . . . p . . . .
4 . b P P . . . .
3 . Q N . . N . .
2 P P . . . P P P
1 R . B . K B . R
a b c d e f g ... | Position: Material is even, the e-file is open, and both kings remain uncastled; White has c4 and d4 against Black's c6 and d5. White's queen on b3 attacks Black's bishop on b4, making Qxb4 an immediate threat, while the bishop pins White's knight on c3.
Candidates: Bxc3+, dxc4, Qe7+
- Bxc3+ bxc3 O-O Bd3: -0.09
...Bx... | Bxc3+ | true | 1 | [{"cost": 0.002566675, "seconds": 38.05, "reasoning_tokens": 4096, "flags": ["move not on the shown lines: Nb8"]}, {"cost": 0.000280135, "seconds": 3.89, "reasoning_tokens": 134, "flags": [], "critic_cost": 0.002163225, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.00501 | false | null | null | null |
lichess:VR7uxu97#ply16 | lichess:VR7uxu97 | games | r2q1rk1/ppp1ppbp/2n2pb1/3p4/3P4/2P2NP1/PP2BP1P/RNBQK2R w KQ - 3 9 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"d7d5",
"e4e5",
"g8f6",
"e5f6",
"g7f6",
"d2d4",
"f8g7",
"g1f3",
"b8c6",
"g2g3",
"c8f5",
"c2c3",
"f5g6",
"f1e2",
"e8g8"
] | false | white | opening | [
{
"move": "O-O",
"line": "O-O e5 Nbd2 a5",
"score": "+6.95"
},
{
"move": "a4",
"line": "a4 e5 O-O Re8",
"score": "+6.73"
},
{
"move": "Nbd2",
"line": "Nbd2 Re8 Nb3 e5",
"score": "+6.80"
}
] | O-O | e1g1 | b1a3 | Na3 | true | {"position":{"side_to_move":"white","move_number":9,"phase":"opening","in_check":false,"castling_rights":{"white":["O-O","O-O-O"],"black":[]},"en_passant_square":null,"recent_moves":"Nf3 Nc6 g3 Bf5 c3 Bg6 Be2 O-O","opening":"B01 Scandinavian Defense","material":{"white":{"queen":1,"rook":2,"bishop":2,"knight":2,"pawn":... | {"position": "White has an extra knight but one fewer pawn, and both sides retain the bishop pair. White's king is still on e1 with the b1-knight and c1-bishop undeveloped; Black's ...e5 break, together with the knight on c6, puts pressure on d4.", "notes": {"O-O": "White castles to secure the king; Black answers ...e5... | Position: White has an extra knight but one fewer pawn, and both sides retain the bishop pair. White's king is still on e1 with the b1-knight and c1-bishop undeveloped; Black's ...e5 break, together with the knight on c6, puts pressure on d4.
Candidates: O-O, a4, Nbd2
- O-O e5 Nbd2 a5: +6.95
White castles to secure t... | FEN: r2q1rk1/ppp1ppbp/2n2pb1/3p4/3P4/2P2NP1/PP2BP1P/RNBQK2R w KQ - 3 9
Side to move: white
Recent moves: 7. c3 Bg6 8. Be2 O-O
Find the best move for white. Think first: list candidate moves, give each a likely line and a score for white (pawns like +0.35, or #n for mate), and pick the highest-scoring one as Best. Then ... | Position: White has an extra knight but one fewer pawn, and both sides retain the bishop pair. White's king is still on e1 with the b1-knight and c1-bishop undeveloped; Black's ...e5 break, together with the knight on c6, puts pressure on d4.
Candidates: O-O, a4, Nbd2
- O-O e5 Nbd2 a5: +6.95
White castles to secure t... | O-O | true | 1 | [{"cost": 0.0013128, "seconds": 18.74, "reasoning_tokens": 1673, "flags": [], "critic_cost": 0.002140225, "critic_tool_calls": 0, "false_claims": [{"quote": "Best: O-O (+6.95)", "why": "Na3 is evaluated at +7.09, higher than O-O at +6.95; the supplied facts describe O-O as a near-equal, more practical alternative to Na... | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.006002 | false | null | null | null |
lichess:aKSWkBVO#ply32 | lichess:aKSWkBVO | games | 3r3r/pp2k2p/2p2p1p/2b1p3/2B1P3/8/PPP2PPP/2KR1R2 w - - 4 17 | rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 | [
"e2e4",
"e7e5",
"g1f3",
"d7d6",
"d2d4",
"b8c6",
"d4e5",
"c6e5",
"f3e5",
"d6e5",
"d1d8",
"e8d8",
"b1c3",
"c8e6",
"c1g5",
"f7f6",
"g5e3",
"f8b4",
"e1c1",
"d8e7",
"c3d5",
"e6d5",
"d1d5",
"c7c6",
"d5d1",
"g8h6",
"e3h6",
"g7h6",
"f1c4",
"b4c5",
"h1f1",
"a8d8"... | false | white | endgame | [
{
"move": "Rxd8",
"line": "Rxd8 Rxd8 Be2 b5",
"score": "+0.13"
},
{
"move": "c3",
"line": "c3 b5 Be2 a5",
"score": "+0.14"
},
{
"move": "Rd7+",
"line": "Rd7+ Rxd7 Be2 Rdd8",
"score": "-6.99"
}
] | c3 | c2c3 | c2c3 | c3 | false | {"position":{"side_to_move":"white","move_number":17,"phase":"endgame","in_check":false,"castling_rights":{"white":[],"black":[]},"en_passant_square":null,"recent_moves":"Rd1 Nh6 Bxh6 gxh6 Bc4 Bc5 Rhf1 Rad8","opening":"C41 Philidor Defense","material":{"white":{"rook":2,"bishop":1,"pawn":7,"points":20,"bishop_pair":fal... | {"position": "Material is level, with two rooks, a bishop and seven pawns each. The rooks face off on the open d-file, while Black's king on e7 is exposed and White's king on c1 is relatively secure. Black's bishop on c5 eyes f2, guarded by White's rook on f1; Black's h-pawns are doubled and isolated.", "notes": {"Rxd8... | Position: Material is level, with two rooks, a bishop and seven pawns each. The rooks face off on the open d-file, while Black's king on e7 is exposed and White's king on c1 is relatively secure. Black's bishop on c5 eyes f2, guarded by White's rook on f1; Black's h-pawns are doubled and isolated.
Candidates: Rxd8, c3,... | FEN: 3r3r/pp2k2p/2p2p1p/2b1p3/2B1P3/8/PPP2PPP/2KR1R2 w - - 4 17
Side to move: white
Board:
8 . . . r . . . r
7 p p . . k . . p
6 . . p . . p . p
5 . . b . p . . .
4 . . B . P . . .
3 . . . . . . . .
2 P P P . . P P P
1 . . K R . R . .
a b c d e f g h
Find the best move for white. Think first: list candidate moves, gi... | Position: Material is level, with two rooks, a bishop and seven pawns each. The rooks face off on the open d-file, while Black's king on e7 is exposed and White's king on c1 is relatively secure. Black's bishop on c5 eyes f2, guarded by White's rook on f1; Black's h-pawns are doubled and isolated.
Candidates: Rxd8, c3,... | c3 | true | 0 | [{"cost": 0.0020298, "seconds": 28.88, "reasoning_tokens": 3171, "flags": [], "critic_cost": 0.001508475, "critic_tool_calls": 0, "false_claims": []}] | openai/gpt-6-luna | high | explicit | openai/gpt-6-luna | high | either | Stockfish 19 nodes=100000 multipv=4 threads=1 hash=16 extra=2 extra_nodes=25000 syzygy warm-extra quick=5000 | 0.003538 | false | null | null | null |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.