<prompt> Nyora kupfuurira kweiyi ndima - Mednis akapedza wechipiri mu1955 World Junior Championship kuseri kwaBoris Spassky vaviri vacho vakaenzana mutambo wavo. Akanga ari mutambi wokutanga kukurira Bobby Fischer muU.S. Championship. Akatamba muchikwata cheUS muna 1962 paChess Olympiad yechi15  <response>: uye vakagumisa vari vatatu vakaenzana mu196162 U.S. Championship. Mhedzisiro yemakwikwi yaisanganisira yechitatu muHouston 1974, yakaenzana yechina muNew York City 1980, uye yakaenzana yekutanga muPuerto Rico 1984. Puerto Rico Chess Federation, panzvimbo peUnited States Chess Federation, yakamukurudzira zviri pamutemo nokuda kwezita reGrandmaster. Akatamba mumutambo we 1979 Interzonal muRiga, nzvimbo yake yekuzvarwa. 