Rubuta ci gaba don wannan sakin layi - Josef Kupper (10 Maris 1932 <unk> 5 Yuni 2017) ya kasance dan wasan Switzerland na kasa da kasa (IM) (1955), sau uku da ya lashe gasar zakarun Switzerland (1954, 1957, 1962) da kuma lambar yabo ta azurfa a gasar Olympics ta Chess (1954
) Ya ce: