与“显性单一数”解法一样,“显性数对”也基于正确放置的笔记。关键在于您需要找到 3x3 宫中的 2 个具有相同笔记数对的单元格。这说明这些笔记数对不能用于此 3x3 宫的其他单元格中。因此,您可以将它们从笔记中删除。如果您看看这个例子,将会更容易理解这种策略。
我们来看看这一宫。我们看到空白单元格里填有可能数字的笔记。其中有两个单元格都包含 7 或 9。
这说明其中一个单元格必然为 7,而另一个则为 9。这还说明,7 和 9 不能填入这一宫的其他单元格。
因此,我们将它们从其他单元格的笔记中删除。下一步,我们可以应用在上一课中学到的“显性单一数”规则。我们将在只有一条笔记 6 的单元格中填入 6,而在另一个单元格中填入 4。
这就是在解答数独时如何使用“显性数对”解法的方法。学会它之后,您可以继续学习下面的数独策略。
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