在蛇游戏中，当一个障碍物被打印出来时，我如何解决边界问题？

def check_boundaries(snake_head, grid_size):
    if snake_head[0] < 0 or snake_head[0] >= grid_size[0] or \
       snake_head[1] < 0 or snake_head[1] >= grid_size[1]:
        return True  # 超出边界
    return False

def check_obstacles(snake_head, obstacles):
    if snake_head in obstacles:
        return True  # 碰撞障碍物
    return False

def move_snake(snake, direction, grid_size, obstacles):
    new_head = (snake[0][0] + direction[0], snake[0][1] + direction[1])
    
    if check_boundaries(new_head, grid_size) or check_obstacles(new_head, obstacles):
        return False  # 游戏结束
    
    snake.insert(0, new_head)
    snake.pop()  # 移除蛇尾
    return True

def check_boundaries(snake_head, grid_size):
    if snake_head[0] < 0 or snake_head[0] >= grid_size[0] or \
       snake_head[1] < 0 or snake_head[1] >= grid_size[1]:
        return True
    return False

def check_obstacles(snake_head, obstacles):
    if snake_head in obstacles:
        return True
    return False

def move_snake(snake, direction, grid_size, obstacles):
    new_head = (snake[0][0] + direction[0], snake[0][1] + direction[1])
    
    if check_boundaries(new_head, grid_size) or check_obstacles(new_head, obstacles):
        return False
    
    snake.insert(0, new_head)
    snake.pop()
    return True

# 示例使用
grid_size = (20, 20)
obstacles = [(5, 5), (6, 5), (7, 5)]
snake = [(10, 10), (10, 9), (10, 8)]
direction = (0, -1)  # 向上移动

if move_snake(snake, direction, grid_size, obstacles):
    print("Snake moved successfully:", snake)
else:
    print("Game over!")