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Chess bot developed by University of São Paulo DATA Extension Group.
License: GNU Affero General Public License v3.0
This project forked from lichess-bot-devs/lichess-bot
Chess bot developed by University of São Paulo DATA Extension Group.
License: GNU Affero General Public License v3.0
A função de avaliação do bot é baseada em Redes Neurais, mas hoje utilizamos a providenciada pela biblioteca scikit-learn. Para construir um bot mais forte, devemos implementar uma rede neural mais complexa, que consiga aproximar melhor resultados de entradas complexas
Espera-se que seja criado um novo notebook baseado no 01 com implementações de regressores da biblioteca desejada.
Atualmente o bot demora muito pensando em algumas jogadas. Isso se deve principalmente ao fato de que é necessário realizar uma extensa pesquisa na árvore de lances gerada. A implementação de heurísticas visa priorizar alguns lances, de forma que se chegue a um resultado mais rapidamente.
Atualmente, a ordenação é feita dessa forma
if depth == SEARCH_DEPTH:
all_moves = sorted(all_moves, key=lambda move: self.eval_move(board, move), reverse=board.turn)
considerando apenas o valor das peças, xeque-mate e o número de movimentos possíveis.
def simple_evaluation(self, board: chess.Board) -> float:
# Heuristics against checkmate
if board.is_checkmate() or board.is_check():
if board.turn == chess.WHITE:
return -1000
else:
return 1000
# Simple Evaluation Function
sum_pieces_values = 0
board_fen: str = board.board_fen()
for char in board_fen:
try:
char_value = self.piece_values[char]
except KeyError:
char_value = 0
sum_pieces_values += char_value
number_legal_moves = board.legal_moves.count()
evaluation = number_legal_moves * 0.5 + sum_pieces_values
return evaluation
Sugestões envolvem adicionar xeques e capturas aos lances com prioridade.
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