Fixed engines board init and classic mcts score function

chesspp/mcts/classic_mcts.py

@@ -1,3 +1,5 @@
+import math
+
 import chess
 import random
 import numpy as np
@@ -7,7 +9,7 @@ from chesspp.i_strategy import IStrategy
 class ClassicMcts:
 
     def __init__(self, board: chess.Board, color: chess.Color, strategy: IStrategy, parent=None, move: chess.Move | None = None,
-                 random_state: int | None = None):
+                 random_state: int | None = None, depth: int = 0):
         self.random = random.Random(random_state)
         self.board = board
         self.color = color
@@ -19,6 +21,7 @@ class ClassicMcts:
         self.legal_moves = list(board.legal_moves)
         self.untried_actions = self.legal_moves
         self.score = 0
+        self.depth = depth
 
     def _expand(self) -> 'ClassicMcts':
         """
@@ -29,7 +32,7 @@ class ClassicMcts:
         self.untried_actions.remove(move)
         next_board = self.board.copy()
         next_board.push(move)
-        child_node = ClassicMcts(next_board, color=not self.color, strategy=self.strategy, parent=self, move=move)
+        child_node = ClassicMcts(next_board, color=not self.color, strategy=self.strategy, parent=self, move=move, depth=self.depth+1)
         self.children.append(child_node)
         return child_node
 
@@ -40,7 +43,7 @@ class ClassicMcts:
         :return: the score of the rolled out game
         """
         copied_board = self.board.copy()
-        steps = 1
+        steps = self.depth
         for i in range(rollout_depth):
             if copied_board.is_game_over():
                 break
@@ -49,7 +52,8 @@ class ClassicMcts:
             copied_board.push(m)
             steps += 1
 
-        return self.strategy.analyze_board(copied_board) // steps
+        steps = max(2, steps)
+        return int(self.strategy.analyze_board(copied_board) / math.log2(steps))
 
     def _backpropagate(self, score: float) -> None:
         """