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added endgame check for evaluation

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This commit is contained in:
Lukas Kuess
2024-01-23 19:53:06 +01:00
parent db8dcee339
commit b386a41b4b
1 changed files with 54 additions and 4 deletions
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58
eval.py
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@@ -73,6 +73,16 @@ king_eval = [
-30, -40, -40, -50, -50, -40, -40, -30,
-30, -40, -40, -50, -50, -40, -40, -30
]
king_endgame_eval = [
50, -30, -30, -30, -30, -30, -30, -50,
-30, -30, 0, 0, 0, 0, -30, -30,
-30, -10, 20, 30, 30, 20, -10, -30,
-30, -10, 30, 40, 40, 30, -10, -30,
-30, -10, 30, 40, 40, 30, -10, -30,
-30, -10, 20, 30, 30, 20, -10, -30,
-30, -20, -10, 0, 0, -10, -20, -30,
-50, -40, -30, -20, -20, -30, -40, -50
]
PIECE_TABLES = {
chess.WHITE: {
@@ -81,7 +91,8 @@ PIECE_TABLES = {
chess.BISHOP: bishop_eval,
chess.ROOK: rook_eval,
chess.QUEEN: queen_eval,
chess.KING: king_eval
chess.KING: king_eval,
'end_game_king': king_endgame_eval
},
chess.BLACK: {
chess.PAWN: list(reversed(pawn_eval)),
@@ -89,11 +100,44 @@ PIECE_TABLES = {
chess.BISHOP: list(reversed(bishop_eval)),
chess.ROOK: list(reversed(rook_eval)),
chess.QUEEN: list(reversed(queen_eval)),
chess.KING: list(reversed(king_eval))
chess.KING: list(reversed(king_eval)),
'end_game_king': list(reversed(king_endgame_eval))
}
}
def check_endgame(board: chess.Board) -> bool:
"""
Endgame according to Tomasz Michniewski:
1. Both sides have no queens or
2. Every side which has a queen has additionally no other pieces or one minorpiece maximum.
"""
queens_white = 0
minors_white = 0
queens_black = 0
minors_black = 0
for s in chess.Square:
piece = board.piece_at(s)
if piece is None:
continue
if piece.piece_type == chess.QUEEN:
if piece.color == chess.WHITE:
queens_white += 1
else:
queens_black += 1
if piece.piece_type == chess.BISHOP or piece.piece_type == chess.KNIGHT:
if piece.color == chess.WHITE:
minors_white += 1
else:
minors_black += 1
return (queens_black == 0 and queens_white == 0) or ((queens_black >= 1 and minors_black <= 1) or (queens_white >= 1 and minors_white <= 1))
def score_game(board: chess.Board) -> float:
"""
Calculate the score of the given board regarding the given color
@@ -114,9 +158,15 @@ def score_game(board: chess.Board) -> float:
continue
if piece.color == chess.WHITE:
score += PIECE_VALUES[piece.piece_type] * PIECE_TABLES[chess.WHITE][piece.piece_type][s]
if piece.piece_type == chess.KING and check_endgame(board):
score += PIECE_VALUES[piece.piece_type] * PIECE_TABLES[chess.WHITE]['end_game_king'][s]
else:
score += PIECE_VALUES[piece.piece_type] * PIECE_TABLES[chess.WHITE][piece.piece_type][s]
else:
score -= PIECE_VALUES[piece.piece_type] * PIECE_TABLES[chess.BLACK][piece.piece_type][s]
if piece.piece_type == chess.KING and check_endgame(board):
score -= PIECE_VALUES[piece.piece_type] * PIECE_TABLES[chess.BLACK]['end_game_king'][s]
else:
score -= PIECE_VALUES[piece.piece_type] * PIECE_TABLES[chess.BLACK][piece.piece_type][s]
return score