Kuandika mwendelezo kwa aya hii - Josef Kupper (10 Machi 1932 <unk> 5 Juni 2017) alikuwa Swiss chess International Master (IM) (1955), mara tatu Swiss Chess Championship mshindi (1954, 1957, 1962) na Chess Olympiad mtu binafsi fedha medali mshindi (1954
), na