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Justaminute: It shouldn't be too difficult to construct a game where black gives mate from a distance on move 20.
White moves axb3, bxc3, Na3-c4, Ba3, Qb1. Black moves axb6, Ra6-a5-a4xa3xa1. Then both make random moves on the kingside, and on move 20 Black plays Rxb1 with possible mate.
(ocultar) Si te interesa conocer la evolución del torneo que estás jugando, puedes charlar con tus adversarios en el foro de discusión del torneo. (HelenaTanein) (mostrar todos los consejos)