“X 翼”是一种高级数独解法,它是基于两个平行的行或列。您无需关注 3x3 宫,因为此策略不涉及到宫。
如果您看看这个例子,将会更容易理解这种解法。
我们来看看这两行。它们都有两个单元格包含笔记 4。由于 4 不能重复出现在同一行或同一列中,因此我们可以安全地假设 4 将被放在对角线上:位于浅蓝色单元格或深蓝色单元格中。
现在我们缩小来看看涉及到的列。由于 4 放在对角线上,那么这两列就都已经包含数字 4。这说明我们不能再在这两列填入 4。
因此,我们可以自信地将这两列中所有剩余笔记中的 4 删除。
现在,您已经知道如何在数独中应用“X 翼”解法,可以继续学习下面的高级数独策略“Y 翼”。
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