Mezue ahịrịokwu na-esonụ: E nyere Schmid aha nke International Arbiter na 1975. Ọ bụ onye isi ọka ikpe maka Fischer <unk> Spassky 1972, Karpov <unk> Korchnoi 1978,
Kasparov<unk>Karpov 1986 World Championship matches, na maka Fischer<unk>Spassky 1992 'Revenge Match'.