Kammala jumla mai zuwa: Josef Kupper (10 Maris 1932 <unk> 5 Yuni 2017) ya kasance dan wasan Switzerland na kasa da kasa (IM) (1955), mai nasara sau uku na Swiss Chess Championship (1954, 1957, 1962) kuma mai lashe lambar azurfa ta Olympics na Chess (
1954) ya ba da shawara.