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Packed boards
Built from AkaMiru/pchess-ranked.
Each position is oriented so the side to move is White (Board.mirror when Black is to move). alpha and beta are that side's rank and are not swapped. Positions with castling rights or en passant are dropped. Pins of length 5 or more are in long_pins/ instead of the training files.
Files in train/ and validation/: bits.u64 (N, 12) uint64 bitboards, alpha.f32, beta.f32, pin_len.i8, piece_n.i8, meta.npz.
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