编写一个19*19的围棋游戏

以下是一个基本的19*19围棋游戏的代码示例（使用Python语言）：

# 围棋游戏的主要逻辑

class GoGame:
    def __init__(self):
        self.board_size = 19
        self.board = [[0]*self.board_size for i in range(self.board_size)]
        self.current_player = 1
        self.pass_count = 0
        self.history = []

    def get_board(self):
        return self.board

    def get_current_player(self):
        return self.current_player

    def play(self, x, y):
        if self.board[x][y] != 0:
            return False # 如果该位置已经被占据了，不能落子

        self.board[x][y] = self.current_player
        self.history.append((x, y, self.current_player))

        # 检查是否有任何棋子被吃掉
        for dx, dy in [(0, 1), (0, -1), (1, 0), (-1, 0)]:
            nx, ny = x + dx, y + dy
            if nx < 0 or ny < 0 or nx >= self.board_size or ny >= self.board_size:
                continue
            if self.board[nx][ny] == 3 - self.current_player:
                if not self.check_liberty(nx, ny):
                    self.remove_group(nx, ny)

        # 改变当前玩家
        self.current_player = 3 - self.current_player
        self.pass_count = 0
        return True

    def check_liberty(self, x, y):
        checked = [[False]*self.board_size for i in range(self.board_size)]
        return self._check_liberty(x, y, checked)

    def _check_liberty(self, x, y, checked):
        checked[x][y] = True
        for dx, dy in [(0, 1), (0, -1), (1, 0), (-1, 0)]:
            nx, ny = x + dx, y + dy
            if nx < 0 or ny < 0 or nx >= self.board_size or ny >= self.board_size:
                continue
            if not checked[nx][ny]:
                if self.board[nx][ny] == 0:
                    return True
                elif self.board[nx][ny] == self.board[x][y]:
                    if self._check_liberty(nx, ny, checked):
                        return True
        return False

    def remove_group(self, x, y):
        self.board[x][y] = 0
        for dx, dy in [(0, 1), (0, -1), (1, 0), (-1, 0)]:
            nx, ny = x + dx, y + dy
            if nx < 0 or ny < 0 or nx >= self.board_size or ny >= self.board_size:
                continue
            if self.board[nx][ny] == 3 - self.current_player:
                if not self.check_liberty(nx, ny):
                    self.remove_group(nx, ny)

    def pass_turn(self):
        self.current_player = 3 - self.current_player
        self.pass_count += 1
        if self.pass_count >= 2:
            return False # 如果连续两次pass，游戏结束
        return True

    def undo(self):
        if len(self.history) == 0:
            return False
        x, y, player = self.history.pop()
        self.board[x][y] = 0
        self.current_player = player
        self.pass_count = 0
        return True

该代码包含了围棋游戏的主要逻辑，包括棋盘的初始化、落子、检查落子是否合法、判断棋子的气等等。对于一个完整的围棋游戏来说，还需要编写界面交互等部分。