Mezue ahịrịokwu na-esonụ: Denis Allan meriri Open Chess Championship na 1970. O keere ebe mbụ na Canadian Open Chess Championship na 1984. Ọ bụ otu n'ime naanị ndị egwuregwu anọ na-asọ mpi na Canadian Chess Championship na nke ọ bụla n'ime iri afọ anọ na-esote site na 1960s ruo 1990s. Na 1987, na Szirak, Denis Allan sonyere na
World Chess Championship Interzonal Tournament, ebe ọ nọ n'ọkwa nke 18.