Rubuta ci gaba don wannan sakin layi - A cikin 1946, yana da shekaru 21, Yanofsky ya shiga gasar farko ta farko bayan yakin basasa, a Groningen, kuma ya ci nasara da zakaran 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. Wasansa a gasar Olympics ta Tel Aviv ta 1964
ya sami lambar Grandmaster ta biyu, da kuma lakabi, ta haka ne ya zama na farko da ya zama Grandmaster a cikin Birtaniya Commonwealth.