（棋盘覆盖）在一个2^k×2^k （k≥0）个方格组成的棋盘中，恰有一个方格与其他方格不同，称该方格为特殊方格。棋盘覆盖问题要求用图（b）所示的4种不同形状的L型骨牌覆盖给定棋盘上除特殊方格以外的所有方格，且任何2个L型骨牌不得重叠覆盖。 -(board cover) in a ^ 2 k x 2 ^ k (k zero) of a grid board, just have a grid and other grid is different, says the grid for special grid. Board covering problems require diagram (b), as shown in the four kinds of different shapes of the L domino cover given board unless special grid outside of all grid, and any two L dominoes may not overlap coverage.