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# 三阶鱼 | ||
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<!-- START doctoc generated TOC please keep comment here to allow auto update --> | ||
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> | ||
## 目录 | ||
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- [原理](#%E5%8E%9F%E7%90%86) | ||
- [技巧拓展](#%E6%8A%80%E5%B7%A7%E6%8B%93%E5%B1%95) | ||
- [标签](#%E6%A0%87%E7%AD%BE) | ||
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<!-- END doctoc generated TOC please keep comment here to allow auto update --> | ||
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## 原理 | ||
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因为 | ||
- 存在 3 行 3 列`RegionLineParallel[1,3]` 、`RegionLinePerpendicular[1,3]: | ||
- `RegionLineParallel[n]` 之间互相平行 | ||
- `RegionLinePerpendicular[n]` 之间互相平行 | ||
- `RegionLinePerpendicular[n]` 垂直于`RegionLinePerpendicular[m]` | ||
- `RegionLineParallel[n]` 和`RegionLinePerpendicular[m]`相交于单元格`Cell[nm]` | ||
- 对于候选数`X` | ||
- 在行列`RegionLineParallel[1]` 中 | ||
- 可填入数字`X`的单元格仅`Cell[11]`、`Cell[12]`、`Cell[13]` | ||
- 在行列`RegionLineParallel[2]` 中 | ||
- 可填入数字`X`的单元格仅`Cell[21]`、`Cell[22]`、`Cell[23]` | ||
- 在行列`RegionLineParallel[3]` 中 | ||
- 可填入数字`X`的单元格仅`Cell[31]`、`Cell[32]`、`Cell[33]` | ||
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所以 | ||
- 在行列`RegionLinePerpendicular[1]` 中 | ||
- 除了`Cell[11]`、`Cell[12]`、`Cell[13]`的其他单元格 | ||
- 必不填入数字`X` | ||
- 在行列`RegionLinePerpendicular[2]` 中 | ||
- 除了`Cell[21]`、`Cell[22]`、`Cell[23]`的其他单元格 | ||
- 必不填入数字`X` | ||
- 在行列`RegionLinePerpendicular[3]` 中 | ||
- 除了`Cell[31]`、`Cell[32]`、`Cell[33]`的其他单元格 | ||
- 必不填入数字`X` | ||
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> 分析 9 格中数字`X`的数量c:`c >= 3 && c <= 3` → `c == 3` | ||
 | ||
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### 技巧拓展 | ||
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- [[二阶鱼]]:拓展分析行列区域的数量 | ||
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## 标签 | ||
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#Level/c | ||
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> [SudokuWiki.org - Swordfish Strategy](https://www.sudokuwiki.org/Sword_Fish_Strategy) |
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# 分类 | ||
<!-- START doctoc generated TOC please keep comment here to allow auto update --> | ||
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> | ||
**目录** | ||
## 目录 | ||
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- [分类](#%E5%88%86%E7%B1%BB) | ||
- [按区域数分类](#%E6%8C%89%E5%8C%BA%E5%9F%9F%E6%95%B0%E5%88%86%E7%B1%BB) | ||
- [标签](#%E6%A0%87%E7%AD%BE) | ||
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<!-- END doctoc generated TOC please keep comment here to allow auto update --> | ||
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## 按区域数分类 | ||
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- [[二阶鱼]] | ||
- [[三阶鱼]] | ||
- [[四阶鱼]] | ||
- | ||
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## 标签 | ||
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#Level/c |