Kammala wannan jumla: A 1946, yana da shekara 21, Yanofsky ya shiga gasar farko ta farko bayan yakin basasa, a Groningen, kuma ya ci nasara da zakara na Soviet da kuma lashe gasar Mikhail Botvinnik, ya lashe kyautar kyauta. A cikin shekaru biyu masu zuwa, ya buga wasanni da yawa na Turai, inda kyakkyawan sakamakonsa ya kasance na biyu a bayan Miguel Najdorf a Barcelona 1946. Yanofsky ya wakilci Kanada a Interzonals da aka gudanar a Saltsjöbaden 1948 da Stockholm 1962. Ya lashe gasar zakarun Birtaniya a shekarar 1953. A gasar wasan chess ta Dallas ta 1957, Yanofsky ya cimma matsayinsa na farko na Grandmaster tare da cin nasara a kan Samuel Reshevsky, Friðrik Ólafsson da Larry Evans. Ayyukansa a
Wasannin Olympics na Tel Aviv na 1964 ya ba shi lambar yabo ta biyu, kuma taken, don haka ya zama babban mashahurin farko da aka haifa a cikin Commonwealth na Burtaniya.