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Explicação
O sinal # é acrescentado a um lance que dá xeque-mate. O rei fica atacado e não existe nenhum lance legal que possa salvá-lo. Não é possível mover o rei para uma casa segura, capturar a peça atacante com nenhuma peça nem bloquear o ataque quando esse tipo de ataque permite um bloqueio.
A Notação Algébrica Padrão, chamada Standard Algebraic Notation (SAN) em inglês, é o sistema de letras e casas usado por , um formato de texto para armazenar partidas. Na SAN, # é a marca padrão de mate. A notação da Federação Internacional de Xadrez (FIDE) para planilhas também permite , mas outras fontes usam esse sinal para xeque duplo. Por isso, # é menos ambíguo.
# faz parte do último lance. Ele não substitui a . Um registro completo ainda termina com 1-0 ou 0-1, conforme quem venceu. Já indica um xeque para o qual existe uma defesa legal.
Fontes
- 1.FIDE Laws of Chess taking effect from 1 January 2023, FIDE
- 2.Appendix C. Algebraic Notation, FIDE Rules Commission
- 3.Standard: Portable Game Notation Specification and Implementation Guide, rec.games.chess contributors; coordinated by Steven J. Edwards