added lichess bot

lichess-engine.py

@@ -0,0 +1,20 @@
+from lichess_bot.lib.engine_wrapper import MinimalEngine, MOVE
+import chess.engine
+import engine
+
+
+class ProbStockfish(MinimalEngine):
+    def search(self, board: chess.Board, time_limit: chess.engine.Limit, ponder: bool, draw_offered: bool,
+               root_moves: MOVE) -> chess.engine.PlayResult:
+        moves = {}
+        untried_moves = list(board.legal_moves)
+        for move in untried_moves:
+            mean, std = engine.simulate_stockfish_prob(board, move, 10, 4)
+            moves[move] = (mean, std)
+
+        return self.get_best_move(moves)
+
+    def get_best_move(self, moves: dict) -> chess.engine.PlayResult:
+        best_avg = max(moves.items(), key=lambda m: m[1][0])
+        next_move = best_avg[0]
+        return chess.engine.PlayResult(next_move, None)