main.py

# Simple Chess Game in Python

class Piece:
    def __init__(self, color):
        self.color = color

    def get_possible_moves(self, board, position):
        raise NotImplementedError("This method should be implemented by subclasses.")

class Pawn(Piece):
    def get_possible_moves(self, board, position):
        # Implement pawn-specific movement logic
        pass

class Rook(Piece):
    def get_possible_moves(self, board, position):
        # Implement rook-specific movement logic
        pass

class Knight(Piece):
    def get_possible_moves(self, board, position):
        # Implement knight-specific movement logic
        pass

class Bishop(Piece):
    def get_possible_moves(self, board, position):
        # Implement bishop-specific movement logic
        pass

class Queen(Piece):
    def get_possible_moves(self, board, position):
        # Implement queen-specific movement logic
        pass

class King(Piece):
    def get_possible_moves(self, board, position):
        # Implement king-specific movement logic
        pass

class Board:
    def __init__(self):
        self.board = self.setup_board()

    def setup_board(self):
        # Initialize the board with pieces in their starting positions
        board = [[None for _ in range(8)] for _ in range(8)]
        # Place pawns
        for i in range(8):
            board[1][i] = Pawn('black')
            board[6][i] = Pawn('white')
        # Place other pieces
        placement = [Rook, Knight, Bishop, Queen, King, Bishop, Knight, Rook]
        for i, piece_class in enumerate(placement):
            board[0][i] = piece_class('black')
            board[7][i] = piece_class('white')
        return board

    def print_board(self):
        for row in self.board:
            print(" | ".join([self.get_piece_symbol(piece) for piece in row]))
            print("-" * 33)

    def get_piece_symbol(self, piece):
        if piece is None:
            return "  "
        symbols = {
            Pawn: 'P', Rook: 'R', Knight: 'N',
            Bishop: 'B', Queen: 'Q', King: 'K'
        }
        color = 'w' if piece.color == 'white' else 'b'
        return color + symbols[type(piece)]

    def move_piece(self, from_pos, to_pos):
        fx, fy = from_pos
        tx, ty = to_pos
        piece = self.board[fy][fx]
        if piece and self.is_valid_move(piece, from_pos, to_pos):
            self.board[ty][tx] = piece
            self.board[fy][fx] = None
            return True
        else:
            return False

    def is_valid_move(self, piece, from_pos, to_pos):
        # Implement move validation logic
        return True

def parse_position(pos_str):
    columns = {'a': 0, 'b': 1, 'c': 2, 'd': 3,
               'e': 4, 'f': 5, 'g': 6, 'h': 7}
    try:
        col = columns[pos_str[0].lower()]
        row = 8 - int(pos_str[1])
        return (col, row)
    except (KeyError, ValueError, IndexError):
        return None

def main():
    board = Board()
    current_player = 'white'
    while True:
        board.print_board()
        print(f"{current_player.capitalize()}'s turn.")
        move = input("Enter your move (e.g., e2 e4): ")
        try:
            from_str, to_str = move.strip().split()
            from_pos = parse_position(from_str)
            to_pos = parse_position(to_str)
            if from_pos and to_pos:
                if board.move_piece(from_pos, to_pos):
                    current_player = 'black' if current_player == 'white' else 'white'
                else:
                    print("Invalid move. Try again.")
            else:
                print("Invalid input. Use the format 'e2 e4'.")
        except ValueError:
            print("Invalid input. Use the format 'e2 e4'.")

if __name__ == "__main__":
    main()