def square_to_point(sq):
    """(str) -> tuple
    Compute the (x, y) coordinates of the center of a square.
    Used to properly place the square's owner when it's captured.
    """
    if sq == 'top_left':
        return (200, 400)
    
    elif sq == 'top_right':
        return (400, 400)
    
    elif sq == 'bottom_left':
        return (200, 200)
    
    elif sq == 'bottom_right':
        return (400, 200)