> For the complete documentation index, see [llms.txt](https://sudoku.kazusa.tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sudoku.kazusa.tech/chain-theory/10-forcing-chains.md).

# 强制链

我们继续延伸讨论链理论的内容。之前提到，链理论有多个思想。今天我们来看的是第二个思想。