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