“Y 翼”解法与“X 翼”类似,但它是基于三个角,而不是四个。
我们来看看这种解法的例子。
开始时,我们需要找到一个刚好有两条笔记的单元格。我们将这个单元格叫做“折点”。
然后,我们再找两个也有 2 条笔记的单元格。这些单元格(叫做“钳”)应该和“折点”位于同一行、同一列或同一宫中。每个“钳”中的两个数字之一应该与“折点”中的相同。两个“钳”中的另一个数字相同。
现在,我们来看看两个“钳”在哪里交叉。我们看到是在最下面一行中的单元格。如果这个单元格包含两个“钳”共享的笔记,那么我们可以将其排除。在这种情况下,应该是数字 4,因为两个“钳”中都有 4。
这就是“Y 翼”解法的原理。它是一种高级数独策略,您可能需要一些时间和练习才能弄明白。
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