Rubuta ci gaba don wannan sakin layi - Aitken ya koyi wasan kwaikwayo daga mahaifinsa a lokacin da yake da shekaru 10. Ya kasance zakaran Scotland a 1935, 1952, 1953, 1955, 1956, 1957, 1958, 1960, 1961 da 1965, na biyun tare da PM Jamieson. Ya kuma kasance Gwarzon London a shekarar 1950. A shekarar 1959 ya sami kyakkyawan sakamako a Gasar Burtaniya, inda ya gama a matsayi na bakwai. Aitken ya wakilci Scotland a gasar Olympics ta Chess guda hudu. Ya taka leda a Stockholm 1937, yana da kashi 32.4% kawai amma ya ci nasara da GM na Sweden Gideon Ståhlberg kuma ya yi wasa da GM na Amurka Samuel Reshevsky. Ya buga kwamitin na biyu a Munich 1958 da Tel Aviv 1964
, suna da kashi 67.6% da 28.1%. Aitken ya buga kwamitin na shida a Skopje 1972, yana samun kashi 38.9%.