Tuhia he tohutoro mō tēnei wāhanga - I ako a Aitken i te hākinakina mai i tōna pāpā i te 10 o ōna tau. Ko ia te toa Scottish i te 1935, 1952, 1953, 1955, 1956, 1957, 1958, 1960, 1961 me te 1965, ko te whakamutunga i te taha o PM Jamieson. I riro hoki ia hei Toa o Rānana i te tau 1950. I te tau 1959 i eke ia ki tana hua pai rawa atu i te Whakataetae o Ingarangi, i te mutunga o te whitu o nga waahi. I tohu a Aitken i a Scotland i roto i nga Olympics Chess e wha. I takaro ia i runga i te poari i Stockholm 1937, i eke 32.4% anake engari i hinga ia i te GM Swedish a Gideon Ståhlberg ka tohaina ki te GM o Amerika a Samuel Reshevsky. I takaro ia i te poari tuarua i Munich 1958 me Tel Aviv 1964, e eke ana ki te 67.6% me te 28.1%. I takaro a Aitken i te poari tuaono i Skopje 1972
, e eke ana ki te 38.9%.