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Explicação
O símbolo ++ não tem um significado universal. No apêndice de notação da Federação Internacional de Xadrez (FIDE), ele pode representar xeque-mate, a situação em que o rei está atacado e não existe uma resposta legal, como alternativa a .
Em muitos livros e sites, ++ é usado, em vez disso, para xeque duplo, uma situação em que duas peças atacam o rei ao mesmo tempo. Por isso, duas fontes podem mostrar o mesmo sinal com significados diferentes.
A Notação Algébrica Padrão, chamada Standard Algebraic Notation (SAN) em inglês, é o sistema rigoroso para escrever lances usado por , um formato de texto para armazenar partidas. A SAN usa para qualquer xeque e # para mate. Ela não tem um sinal especial para xeque duplo.
Fontes
- 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