棋盘覆盖问题：在一个2的k次幂乘以2的k次幂个方格组成的棋盘中，恰有一个方格与其他方格不同，称该方格为一特殊方格，且称该棋盘为一特殊棋盘。在棋盘覆盖问题中，用四种不同形态的L型骨牌覆盖给定的特殊棋盘上除特殊方格以外的所有方格。

-chessboard coverage : two in a k-th power of 2 multiplied by the k-th power grid consisting of a chessboard, and a box with the other box, the box said to a special box and said the chessboard for a special chessboard. On the chessboard coverage, in four different forms of L-type domino coverage to the special chessboard except in special box outside the box at all.