# 唯一矩形（UR）

欢迎来到新的数独技巧。从这个技巧开始，我们将会连着介绍一组难度不大，但推理思路比较脱离常规思维的技巧类型：**致命结构**（Deadly Pattern）。

简单来说，致命结构的本质是基于游戏唯一解的要求，所以它的思维会显得比较神奇一些。

为了方便介绍后面的东西，和鱼一样，致命结构这个大体系在前面我们只会讲解一部分简单的、易于理解和方便找到的一部分内容；剩下的部分我们会放在以后再说。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://sudoku.kazusa.tech/full-marking-techniques/04-unique-rectangle.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.