<prompt> Nyorera kupfuurira kweiyi ndima - Evans akamiririra U.S. muOlympia yeChess masere pamusoro pemakore makumi maviri nematanhatu, achikunda menduru dzendarama 1950, sirivha 1958, uye ndarira 1976 pamutambo wake, uye achitora chikamu muchikwata chegoridhe 1976 nesirivha 1966  <response>: mibairo. 