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解释
着法末尾的 # 符号表示对方王受到攻击，且没有任何合法应着能解除攻击。该状态就是将死，因此对局立即结束。
在 的标准形式 Standard Algebraic Notation (SAN) 中，Qxf7# 表示后在 f7 吃子并将死。Q 代表后，x 表示吃子，# 表示对王造成的效果。将死符号写在着法末尾。
Portable Game Notation (PGN) 是对局文件的纯文本格式，它以 # 作为标准写法。在受国际棋联（FIDE）规则约束的赛事记录纸上，++ 也可用于表示将死，这两种标记都是可选的。PGN 并未规定 ++ 专用于双将：不是将死的将军使用 ，将死则使用 #。
用法与背景
在完整的 PGN 文件中，若白方获胜，结果还会另行记录为 ；若黑方获胜，则记录为 。# 描述将死着法，但不能取代结果标记。
常见混淆
# 与 +
# 表示不存在合法防守，对局已经结束。+ 表示王被将军，但仍至少有一种合法应着。
查看术语来源
- 1.FIDE Laws of Chess taking effect from 1 January 2023, FIDE
- 2.Standard: Portable Game Notation Specification and Implementation Guide, rec.games.chess contributors, coordinated by Steven J. Edwards