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# 均衡性数对

## 原理

因为

* 对于单元格`Cell1`、`Cell2`：
  * `Cell1`的候选为`X[1,i]`
  * `Cell2`的候选为`Y[1,j]`
  * 遍历`Cell1`、`Cell2`的不同组合，当`Cell2 = Y[j]`时，盘面都存在矛盾

所以

* `Cell2`必不填入数字`Y[j]`

### 技巧转换

* \[\[多分支匹配法]]：枚举`删除结论的单元格`和`多分支匹配的起始分析单元格`的情况出发分析

> [SudokuWiki.org - Aligned Pair Exclusion](https://www.sudokuwiki.org/Aligned_Pair_Exclusion)