File size: 2,894 Bytes
e80b55d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | """Minimal UCI wrapper for a Stockfish process."""
from __future__ import annotations
import os
import subprocess
DEFAULT_PATH = os.path.join(
os.path.dirname(os.path.abspath(__file__)),
"engines", "stockfish", "stockfish", "stockfish-windows-x86-64-universal.exe",
)
CREATE_NO_WINDOW = 0x08000000
class StockfishEngine:
def __init__(self, path: str | None = None, skill: int = 3,
movetime_ms: int = 400, threads: int = 1, hash_mb: int = 32):
self.path = path or DEFAULT_PATH
if not os.path.isfile(self.path):
raise FileNotFoundError(self.path)
self.skill = max(0, min(20, int(skill)))
self.movetime_ms = max(50, int(movetime_ms))
self.proc = subprocess.Popen(
[self.path],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
text=True,
encoding="utf-8",
errors="replace",
bufsize=1,
creationflags=CREATE_NO_WINDOW,
)
self._send("uci")
self._wait("uciok")
self._send("setoption name Skill Level value {}".format(self.skill))
self._send("setoption name Threads value {}".format(max(1, threads)))
self._send("setoption name Hash value {}".format(max(1, hash_mb)))
self._send("isready")
self._wait("readyok")
self.new_game()
def _send(self, line: str) -> None:
if self.proc.poll() is not None:
raise RuntimeError("Stockfish process is not running")
self.proc.stdin.write(line + "\n")
self.proc.stdin.flush()
def _wait(self, token: str) -> None:
while True:
line = self.proc.stdout.readline()
if not line:
raise RuntimeError("Stockfish closed stdout")
if line.strip() == token:
return
def new_game(self) -> None:
self._send("ucinewgame")
self._send("isready")
self._wait("readyok")
def best_move(self, board, depth: int | None = None) -> str:
self._send("position fen " + board.fen())
if depth:
self._send("go depth {}".format(max(1, int(depth))))
else:
self._send("go movetime {}".format(self.movetime_ms))
while True:
line = self.proc.stdout.readline()
if not line:
raise RuntimeError("Stockfish closed stdout")
parts = line.strip().split()
if parts and parts[0] == "bestmove":
return parts[1]
def close(self) -> None:
try:
if self.proc.poll() is None:
self._send("quit")
self.proc.wait(timeout=5)
except Exception:
pass
finally:
try:
self.proc.kill()
except Exception:
pass
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