| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. G A Thomas vs Aitken |
| 0-1 | 51 |
1937 |
7th olm final | C78 Ruy Lopez |
| 2. Prins vs Aitken |
| ½-½ | 52 |
1945 |
Hastings | C71 Ruy Lopez |
| 3. E G Sergeant vs Aitken |
| 0-1 | 64 |
1945 |
Hastings | C79 Ruy Lopez, Steinitz Defense Deferred |
| 4. G A Thomas vs Aitken |
| ½-½ | 27 |
1949 |
Southsea | C86 Ruy Lopez, Worrall Attack |
| 5. Schmid vs Aitken |
| 1-0 | 37 |
1950 |
Southsea | C75 Ruy Lopez, Modern Steinitz Defense |
| 6. A Tarnowski vs Aitken |
| ½-½ | 39 |
1958 |
13th olm qual. group 3 | C71 Ruy Lopez |
| 7. F Campomanes vs Aitken |
| 0-1 | 41 |
1958 |
13th olm qual. group 3 | C68 Ruy Lopez, Exchange |
| 8. J Littlewood vs Aitken |
| 0-1 | 76 |
1959 |
BCF-ch | C71 Ruy Lopez |
| 9. C H Alexander vs Aitken |
| ½-½ | 43 |
1959 |
BCF-ch | C71 Ruy Lopez |
| 10. E G Sergeant vs Aitken |
| ½-½ | 48 |
1959 |
BCF-ch | C79 Ruy Lopez, Steinitz Defense Deferred |
| 11. L Barden vs Aitken |
 | 0-1 | 24 |
1959 |
BCF-ch | C75 Ruy Lopez, Modern Steinitz Defense |
| 12. M Haygarth vs Aitken |
| 1-0 | 58 |
1959 |
BCF-ch | C75 Ruy Lopez, Modern Steinitz Defense |
| 13. D Mardle vs Aitken |
| ½-½ | 38 |
1962 |
Whitby British ch | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 14. P B Cook vs Aitken |
 | 0-1 | 48 |
1962 |
Whitby British ch | C78 Ruy Lopez |
| 15. J Littlewood vs Aitken |
| 1-0 | 65 |
1962 |
Whitby British ch | C78 Ruy Lopez |
| 16. J Llado Lumbera vs Aitken |
| ½-½ | 30 |
1963 |
Enschede zt | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 17. A Dueckstein vs Aitken |
| 1-0 | 37 |
1964 |
Tel Aviv ol (Men) | C96 Ruy Lopez, Closed |
| 18. P N Lee vs Aitken |
| 1-0 | 37 |
1968 |
BCF-ch | C78 Ruy Lopez |
| 19. F N Stephenson vs Aitken |
| 1-0 | 64 |
1968 |
BCF-ch Aitken | C78 Ruy Lopez |