very good petr 2

import chess

def simplify_fen_string(fen):
    parts = fen.split(' ')
    simplified_fen = ' '.join(parts[:4])  # Zachováváme informace o pozici, hráči na tahu, rošádách a en passant
    return simplified_fen

def minimax(board, depth, alpha, beta, maximizing_player, depth2):
    if depth == 0 or board.is_game_over():
        return None, evaluate_board(board, depth2)

    best_move = None

    if maximizing_player:
        max_eval = float('-inf')
        for move in board.legal_moves:
            board.push(move)
            _, eval = minimax(board, depth - 1, alpha, beta, False, depth2 + 1)
            board.pop()
            if eval > max_eval:
                max_eval = eval
                best_move = move
            alpha = max(alpha, eval)
            if beta <= alpha:
                break
        return best_move, max_eval
    else:
        min_eval = float('inf')
        for move in board.legal_moves:
            board.push(move)
            _, eval = minimax(board, depth - 1, alpha, beta, True, depth2 + 1)
            board.pop()
            if eval < min_eval:
                min_eval = eval
                best_move = move
            beta = min(beta, eval)
            if beta <= alpha:
                break
        return best_move, min_eval

def evaluate_board(board, depth):
    if board.is_checkmate():
        return -1000 + depth if board.turn == chess.WHITE else 1000 - depth
    elif board.is_stalemate() or board.is_insufficient_material():
        return 0
    return 0

# Nastavení startovní pozice
start_fen = "8/8/8/8/1B6/2KN4/k7/8 w - - 0 1"

#start_fen = "8/8/3k4/8/3K4/8/8/8 w - - 0 1"

#start_fen = "7K/8/k1P5/7p/8/8/8/8 w - - 0 1"

board = chess.Board(start_fen)

# Spuštění minimaxu s maximální hloubkou 3
best_move, best_score = minimax(board, 7, float('-inf'), float('inf'), True, 0)
if best_move:
    move_san = board.san(best_move)
    print(f"Nejlepší tah z pozice {start_fen} je {move_san} s hodnocením {best_score}.")
else:
    print("Nebyl nalezen žádný tah, nebo je hra u konce. Skóre: ", best_score)