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解释
符号 ++ 没有统一含义。在国际棋联 (FIDE) 的记谱附录中，它可以表示将杀，即王受到攻击且没有任何合法应对，作为 的替代写法。
许多书籍和网站则用 ++ 表示双将，即两枚棋子同时攻击王。因此，不同资料可能对同一个符号采用不同含义。
Standard Algebraic Notation (SAN) 是 使用的严格着法记录体系。SAN 对任何将军都使用 ，对将杀使用 #，并没有双将专用符号。
来源
- 1.Appendix C. Algebraic Notation, FIDE Rules Commission
- 2.Standard: Portable Game Notation Specification and Implementation Guide, rec.games.chess contributors; coordinated by Steven J. Edwards
- 3.Chess annotation symbols, Wikimedia Foundation