<prompt> Qedela umusho olandelayo: U-Evans wamelela i-U.S. kuma-Olympics ayisishiyagalombili e-Chess esikhathini esiyiminyaka engamashumi amabili nesithupha, wathola igolide  <response>: Ngo-1950, isiliva 1958, nethusi 1976 izindondo ngomdlalo wakhe, futhi wabamba iqhaza emidlalweni yegolide 1976 nesiliva 1966. 