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| 1 | +# Chess game with basic piece movement logic |
| 2 | + |
| 3 | +class Piece: |
| 4 | + def __init__(self, color): |
| 5 | + self.color = color |
| 6 | + |
| 7 | + def is_valid_move(self, start_pos, end_pos, board): |
| 8 | + raise NotImplementedError("This method should be overridden by subclasses") |
| 9 | + |
| 10 | + |
| 11 | +class Pawn(Piece): |
| 12 | + def is_valid_move(self, start_pos, end_pos, board): |
| 13 | + row_start, col_start = start_pos |
| 14 | + row_end, col_end = end_pos |
| 15 | + |
| 16 | + if self.color == 'white': |
| 17 | + if row_start == 6 and row_start - row_end == 2 and col_start == col_end: |
| 18 | + return True |
| 19 | + if row_start - row_end == 1 and col_start == col_end: |
| 20 | + return True |
| 21 | + else: # black |
| 22 | + if row_start == 1 and row_end - row_start == 2 and col_start == col_end: |
| 23 | + return True |
| 24 | + if row_end - row_start == 1 and col_start == col_end: |
| 25 | + return True |
| 26 | + return False |
| 27 | + |
| 28 | + |
| 29 | +class Rook(Piece): |
| 30 | + def is_valid_move(self, start_pos, end_pos, board): |
| 31 | + row_start, col_start = start_pos |
| 32 | + row_end, col_end = end_pos |
| 33 | + return row_start == row_end or col_start == col_end |
| 34 | + |
| 35 | + |
| 36 | +class Knight(Piece): |
| 37 | + def is_valid_move(self, start_pos, end_pos, board): |
| 38 | + row_start, col_start = start_pos |
| 39 | + row_end, col_end = end_pos |
| 40 | + row_diff = abs(row_start - row_end) |
| 41 | + col_diff = abs(col_start - col_end) |
| 42 | + return (row_diff == 2 and col_diff == 1) or (row_diff == 1 and col_diff == 2) |
| 43 | + |
| 44 | + |
| 45 | +class Bishop(Piece): |
| 46 | + def is_valid_move(self, start_pos, end_pos, board): |
| 47 | + row_start, col_start = start_pos |
| 48 | + row_end, col_end = end_pos |
| 49 | + return abs(row_start - row_end) == abs(col_start - col_end) |
| 50 | + |
| 51 | + |
| 52 | +class Queen(Piece): |
| 53 | + def is_valid_move(self, start_pos, end_pos, board): |
| 54 | + row_start, col_start = start_pos |
| 55 | + row_end, col_end = end_pos |
| 56 | + return abs(row_start - row_end) == abs(col_start - col_end) or row_start == row_end or col_start == col_end |
| 57 | + |
| 58 | + |
| 59 | +class King(Piece): |
| 60 | + def is_valid_move(self, start_pos, end_pos, board): |
| 61 | + row_start, col_start = start_pos |
| 62 | + row_end, col_end = end_pos |
| 63 | + return abs(row_start - row_end) <= 1 and abs(col_start - col_end) <= 1 |
| 64 | + |
| 65 | + |
| 66 | +class Board: |
| 67 | + def __init__(self): |
| 68 | + self.board = self.setup_board() |
| 69 | + |
| 70 | + def setup_board(self): |
| 71 | + board = [[None for _ in range(8)] for _ in range(8)] |
| 72 | + |
| 73 | + for i in range(8): |
| 74 | + board[1][i] = Pawn('black') |
| 75 | + board[6][i] = Pawn('white') |
| 76 | + |
| 77 | + board[0][0] = board[0][7] = Rook('black') |
| 78 | + board[7][0] = board[7][7] = Rook('white') |
| 79 | + |
| 80 | + board[0][1] = board[0][6] = Knight('black') |
| 81 | + board[7][1] = board[7][6] = Knight('white') |
| 82 | + |
| 83 | + board[0][2] = board[0][5] = Bishop('black') |
| 84 | + board[7][2] = board[7][5] = Bishop('white') |
| 85 | + |
| 86 | + board[0][3] = Queen('black') |
| 87 | + board[7][3] = Queen('white') |
| 88 | + |
| 89 | + board[0][4] = King('black') |
| 90 | + board[7][4] = King('white') |
| 91 | + |
| 92 | + return board |
| 93 | + |
| 94 | + def display(self): |
| 95 | + for row in self.board: |
| 96 | + row_display = [] |
| 97 | + for piece in row: |
| 98 | + if piece is None: |
| 99 | + row_display.append(".") |
| 100 | + else: |
| 101 | + row_display.append(piece.__class__.__name__[0] + ('w' if piece.color == 'white' else 'b')) |
| 102 | + print(" ".join(row_display)) |
| 103 | + print() |
| 104 | + |
| 105 | + def move_piece(self, start_pos, end_pos): |
| 106 | + piece = self.get_piece(start_pos) |
| 107 | + if piece is not None and piece.is_valid_move(start_pos, end_pos, self.board): |
| 108 | + self.board[end_pos[0]][end_pos[1]] = piece |
| 109 | + self.board[start_pos[0]][start_pos[1]] = None |
| 110 | + return True |
| 111 | + return False |
| 112 | + |
| 113 | + def get_piece(self, position): |
| 114 | + row, col = position |
| 115 | + return self.board[row][col] |
| 116 | + |
| 117 | + |
| 118 | +class Game: |
| 119 | + def __init__(self): |
| 120 | + self.board = Board() |
| 121 | + self.current_turn = 'white' |
| 122 | + |
| 123 | + def switch_turn(self): |
| 124 | + self.current_turn = 'black' if self.current_turn == 'white' else 'white' |
| 125 | + |
| 126 | + def play(self): |
| 127 | + while True: |
| 128 | + self.board.display() |
| 129 | + print(f"{self.current_turn.capitalize()}'s turn") |
| 130 | + |
| 131 | + try: |
| 132 | + start = input("Enter start position (e.g., 6 0 for row 6, column 0): ").split() |
| 133 | + end = input("Enter end position (e.g., 5 0 for row 5, column 0): ").split() |
| 134 | + start_pos = (int(start[0]), int(start[1])) |
| 135 | + end_pos = (int(end[0]), int(end[1])) |
| 136 | + |
| 137 | + piece = self.board.get_piece(start_pos) |
| 138 | + |
| 139 | + if piece is None or piece.color != self.current_turn: |
| 140 | + print("Invalid move! Try again.") |
| 141 | + continue |
| 142 | + |
| 143 | + if self.board.move_piece(start_pos, end_pos): |
| 144 | + self.switch_turn() |
| 145 | + else: |
| 146 | + print("Invalid move! Try again.") |
| 147 | + |
| 148 | + except (ValueError, IndexError): |
| 149 | + print("Invalid input! Please use the correct format (e.g., 6 0 for row 6, column 0).") |
| 150 | + |
| 151 | + |
| 152 | +if __name__ == "__main__": |
| 153 | + game = Game() |
| 154 | + game.play() |
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