Dee ihe ga-aga n'ihu na paragraf a - O'Hanlon meriri n'egwuregwu Tailteann na nke ugboro abụọ na nke atọ, na 1928 na 1932. Ọ gbaara Ireland bọọlụ n'egwuregwu Chess Olympiads na France na Paris 1924, Warsaw 1935
na Buenos Aires n'afọ 1939. Ozugbo agha ahụ biri, o nwetara ihe nrite n'asọmpi Zaandam e mere na Holland n'afọ 1946. N'oge ọ nwụrụ, John O'Hanlon nọ na-akwadebe ma na-eme usoro ya na atụmatụ ịlaghachi na July na-esote.