| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. G Thomas vs J Davidson |
| 1-0 | 23 | 1914 | Metropolitan CC ch | C77 Ruy Lopez |
| 27. B Leussen vs G Thomas |
| 0-1 | 32 | 1914 | Netherlands - England | C30 King's Gambit Declined |
| 28. G Thomas vs B Leussen |
| 1-0 | 21 | 1914 | Netherlands - England | C63 Ruy Lopez, Schliemann Defense |
| 29. Yates vs G Thomas |
| 1-0 | 61 | 1914 | Yates - Thomas m | C84 Ruy Lopez, Closed |
| 30. G Thomas vs Yates |
| 0-1 | 36 | 1914 | Yates - Thomas m | C49 Four Knights |
| 31. E G Sergeant vs G Thomas |
| 0-1 | 42 | 1915 | City of London CC ch | C30 King's Gambit Declined |
| 32. G Thomas vs H Saunders |
| 0-1 | 32 | 1919 | City of London CC Murton Cup | C86 Ruy Lopez, Worrall Attack |
| 33. G Thomas vs R Michell |
  | ½-½ | 3 | 1919 | Hastings | C60 Ruy Lopez |
| 34. G Thomas vs V Wahltuch |
| ½-½ | 61 | 1919 | Hastings | C77 Ruy Lopez |
| 35. Yates vs G Thomas |
| ½-½ | 68 | 1919 | Hastings | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 36. G Thomas vs M Marchand |
| 1-0 | 68 | 1919 | Hastings | B32 Sicilian |
| 37. Capablanca vs G Thomas |
| 1-0 | 29 | 1919 | Hastings | C66 Ruy Lopez |
| 38. G Thomas vs H G Cole |
| 1-0 | 72 | 1919 | Hastings | C42 Petrov Defense |
| 39. G Thomas vs W Winter |
| 1-0 | 47 | 1919 | Hastings | B16 Caro-Kann, Bronstein-Larsen Variation |
| 40. R Scott vs G Thomas |
| 0-1 | 56 | 1919 | Hastings | D30 Queen's Gambit Declined |
| 41. G Thomas vs Kostic |
| ½-½ | 40 | 1919 | Hastings | C42 Petrov Defense |
| 42. Olland vs G Thomas |
| ½-½ | 38 | 1919 | Hastings | C62 Ruy Lopez, Old Steinitz Defense |
| 43. F Alexander vs G Thomas |
| 0-1 | 44 | 1919 | City of London CC-ch | D52 Queen's Gambit Declined |
| 44. G Thomas vs A Sollas |
| 1-0 | 23 | 1920 | Bromley | B12 Caro-Kann Defense |
| 45. L Dewing vs G Thomas |
| 0-1 | 29 | 1920 | Bromley | C71 Ruy Lopez |
| 46. G Thomas vs R Scott |
| 1-0 | 54 | 1920 | Bromley | B18 Caro-Kann, Classical |
| 47. G Thomas vs J Macalister |
| 1-0 | 36 | 1920 | Bromley | B01 Scandinavian |
| 48. G Thomas vs R Gaudin |
| 1-0 | 30 | 1920 | Bromley | C67 Ruy Lopez |
| 49. F Brown vs G Thomas |
| 0-1 | 49 | 1920 | Bromley | C68 Ruy Lopez, Exchange |
| 50. M Marchand vs G Thomas |
| ½-½ | 29 | 1920 | Bromley | D67 Queen's Gambit Declined, Orthodox Defense, Bd3 line |
Kibitzing
