<prompt> Pedzisa mutsara unotevera: Evans akamiririra U.S. mumitambo misere yeChess Olympiad pamusoro pemakore makumi maviri nematanhatu, achikunda ndarama  <response>: 1950, sirivha 1958, uye menduru dzebronze 1976 pamutambo wake, uye kutora chikamu muchikwata chegoridhe 1976 uye menduru dzesirivheri 1966. 