def METHOD_NAME():
    if isDone():
        return True
    for r in range(size):
        for c in range(size):
            if board[r][c] != 'o':
                continue
            # Move 'right'?
            if check(r, c, 0, +1):
                return True
            # Move 'left'?
            if check(r, c, 0, -1):
                return True
            # Move 'down'?
            if check(r, c, +1, 0):
                return True
            # Move 'up'?
            if check(r, c, -1, 0):
                return True
    return False