Mezue ahịrịokwu na-esonụ: Josef Kupper (10 Machị 1932 <unk> 5 June 2017) bụ onye Switzerland chess International Master (IM) (1955), onye mmeri Switzerland Chess Championship ugboro atọ (1954, 1957, 1962) na onye mmeri ọla ọcha na Chess Olympiad (
1954) na ndị ọzọ.