我们将存在一特殊方格的棋盘称为特殊棋盘，用L型骨牌覆盖此棋盘，不允许骨牌间相互叠加与超出棋盘范围。-We will exist a special board called the special checkerboard squares, covering the board with L-type domino, superimposed on each other and go beyond the scope of the board between the dominoes are not allowed.