added engine factory and adapted command line parsing, added lc0_strategy.py, added stockfish and lc0 standalone engines

chesspp/lc0_strategy.py

@@ -0,0 +1,39 @@
+import chess
+import chess.engine
+import os
+
+from chesspp.i_strategy import IStrategy
+from chesspp.eval import score_lc0
+
+_DIR = os.path.abspath(os.path.dirname(__file__))
+
+
+class Lc0Strategy(IStrategy):
+    def __init__(self, path="../lc0/lc0", rollout_depth: int = 4,
+                 limit: chess.engine.Limit = chess.engine.Limit(depth=4)):
+        super().__init__(rollout_depth)
+        self._lc0 = None
+        self.path = path
+        self.limit = limit
+
+    def __del__(self):
+        if self._lc0 is not None:
+            self._lc0.quit()
+
+    @property
+    def lc0(self) -> chess.engine.SimpleEngine:
+        if self._lc0 is None:
+            self._lc0 = self.lc0 = chess.engine.SimpleEngine.popen_uci(self.path)
+        return self._lc0
+
+    @lc0.setter
+    def lc0(self, value):
+        self._lc0 = value
+
+    def pick_next_move(self, board: chess.Board) -> chess.Move | None:
+        return self.lc0.play(board, self.limit).move
+
+    def analyze_board(self, board: chess.Board) -> int:
+        score = score_lc0(board, self.lc0)
+        print("lc0 score", score)
+        return score