Pedzisa mutsara unotevera: O'Hanlon akakunda Mitambo yeTailteann kechipiri uye kechitatu, muna 1928 uye muna 1932. Akatamba nokuda kweIreland muOlympiads yeChess isiri yepamutemo uye yepamutemo muFrance paParis 1924, Warsaw 1935 uye
Buenos Aires muna 1939. Hondo ichangopera, akahwina mubayiro pamutambo weZaandam muHolland muna 1946. Panguva yokufa kwake, John O'Hanlon akanga achigadzirira uye achidzidzira unyanzvi hwake nehurongwa hwokudzoka muna July akatevera.