<prompt> Pedzisa mutsara unotevera: Evans akamiririra U.S. mumakumi masere Chess Olympiads pamusoro penguva yemakore makumi maviri nematanhatu, kuhwina goridhe 1950, sirivha 1958, uye menduru dzebronze 1976 pamutambo wake, uye kutora chikamu muchikwata goridhe 1976 uye sirivha  <response>: 1966 menduru. 