| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J M Aitken vs G Thomas |
| 0-1 | 51 | 1938 | British Championship | B60 Sicilian, Richter-Rauzer |
| 27. H Mallison vs J M Aitken |
| 0-1 | 34 | 1938 | British Championship | C79 Ruy Lopez, Steinitz Defense Deferred |
| 28. J M Aitken vs Menchik |
 | ½-½ | 63 | 1938 | British Championship | D51 Queen's Gambit Declined |
| 29. Milner-Barry vs J M Aitken |
| 0-1 | 27 | 1938 | British Championship | C23 Bishop's Opening |
| 30. J M Aitken vs E G Sergeant |
| 0-1 | 68 | 1938 | British Championship | B45 Sicilian, Taimanov |
| 31. C H Alexander vs J M Aitken |
| 1-0 | 27 | 1938 | British Championship | C74 Ruy Lopez, Modern Steinitz Defense |
| 32. J M Aitken vs A Lenton |
| 1-0 | 24 | 1938 | British Championship | B13 Caro-Kann, Exchange |
| 33. J Gilchrist vs J M Aitken |
| ½-½ | 40 | 1939 | SCO-ch | C29 Vienna Gambit |
| 34. J M Aitken vs M Pavey |
| 0-1 | 49 | 1939 | SCO-ch | B54 Sicilian |
| 35. J M Aitken vs L H Geronimus |
| 1-0 | 66 | 1939 | SCO-ch | C62 Ruy Lopez, Old Steinitz Defense |
| 36. J M Aitken vs Robert Forbes Coombe |
| 0-1 | 33 | 1939 | Scottish Championship | C66 Ruy Lopez |
| 37. J M Aitken vs Flohr |
| 0-1 | 29 | 1939 | Bournemouth | B13 Caro-Kann, Exchange |
| 38. I Koenig vs J M Aitken |
| ½-½ | 44 | 1939 | Bournemouth | A13 English |
| 39. Euwe vs J M Aitken |
 | 1-0 | 36 | 1939 | Bournemouth | D40 Queen's Gambit Declined, Semi-Tarrasch |
| 40. J M Aitken vs F Kitto |
| 1-0 | 27 | 1939 | Bournemouth | C67 Ruy Lopez |
| 41. G Abrahams vs J M Aitken |
| 0-1 | 28 | 1939 | Bournemouth | C50 Giuoco Piano |
| 42. J M Aitken vs P Wallis |
| ½-½ | 50 | 1939 | Bournemouth | D45 Queen's Gambit Declined Semi-Slav |
| 43. S Landau vs J M Aitken |
| ½-½ | 42 | 1939 | Bournemouth | D55 Queen's Gambit Declined |
| 44. J M Aitken vs A G Conde |
| ½-½ | 86 | 1939 | Bournemouth | B10 Caro-Kann |
| 45. A R Thomas vs J M Aitken |
| 1-0 | 64 | 1939 | Bournemouth | E01 Catalan, Closed |
| 46. J M Aitken vs E Klein |
| 0-1 | 38 | 1939 | Bournemouth | C41 Philidor Defense |
| 47. J Mieses vs J M Aitken |
| 0-1 | 29 | 1939 | Bournemouth | C23 Bishop's Opening |
| 48. H G Schenk vs J M Aitken |
| 0-1 | 50 | 1944 | Oxford University vs Bletchley CC Match | D02 Queen's Pawn Game |
| 49. J M Aitken vs Euwe |
| 0-1 | 30 | 1945 | Hastings 1945/46 | C82 Ruy Lopez, Open |
| 50. P Devos vs J M Aitken |
| 0-1 | 34 | 1945 | Hastings 1945/46 | A46 Queen's Pawn Game |
Kibitzing
