During World War II, Aitken worked in Hut 6 at Bletchley Park on solving German Enigma machines. On 2 December 1944 Bletchley Park played a 12-board team match against the Oxford University Chess Club. Bletchley Park won the match 8–4 with C.H.O'D.
During World War II, Aitken worked at Hut 6 at Bletchley Park to break German Enigma codes. On December 2nd, 1944, Bletchley Park defeated the Oxford University Chess Club in a chess match.