| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. B Eley vs I Sinclair |
| 0-1 | 46 | 1974 | British Championship | B23 Sicilian, Closed |
| 27. I Sinclair vs Nunn |
| 0-1 | 35 | 1974 | British Championship | A17 English |
| 28. A Ludgate vs I Sinclair |
| 0-1 | 55 | 1974 | British Championship | D80 Grunfeld |
| 29. I Sinclair vs A H Perkins |
| ½-½ | 41 | 1974 | British Championship | A10 English |
| 30. D Mabbs vs I Sinclair |
| ½-½ | 41 | 1974 | British Championship | D01 Richter-Veresov Attack |
| 31. I Sinclair vs K Stewart |
| ½-½ | 30 | 1975 | Scottish Championship | A04 Reti Opening |
| 32. J W Dick vs I Sinclair |
| ½-½ | 28 | 1975 | Scottish Championship | B22 Sicilian, Alapin |
| 33. I Sinclair vs E Perry |
| 1-0 | 30 | 1975 | Scottish Championship | A84 Dutch |
| 34. I Sinclair vs R M McKay |
| 0-1 | 40 | 1975 | Scottish Championship | A26 English |
| 35. N Young vs I Sinclair |
| 0-1 | 45 | 1975 | Scottish Championship | D91 Grunfeld, 5.Bg5 |
| 36. G Bonner vs I Sinclair |
| 1-0 | 26 | 1975 | Scottish Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 37. I Sinclair vs T Upton |
| ½-½ | 23 | 1975 | Scottish Championship | D02 Queen's Pawn Game |
| 38. M J Haygarth vs I Sinclair |
| ½-½ | 30 | 1975 | British Championship | D90 Grunfeld |
| 39. I Sinclair vs V Knox |
| 0-1 | 29 | 1975 | British Championship | A22 English |
| 40. I Sinclair vs R M McKay |
| ½-½ | 27 | 1975 | British Championship | A04 Reti Opening |
| 41. F Parr vs I Sinclair |
| 1-0 | 38 | 1975 | British Championship | A25 English |
| 42. I Sinclair vs G Bonner |
| 1-0 | 50 | 1975 | British Championship | B01 Scandinavian |
| 43. P J Lee vs I Sinclair |
| ½-½ | 30 | 1975 | British Championship | A29 English, Four Knights, Kingside Fianchetto |
| 44. I Sinclair vs R O'Kelly |
| 1-0 | 41 | 1975 | British Championship | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 45. B Eley vs I Sinclair |
| 1-0 | 31 | 1975 | British Championship | B49 Sicilian, Taimanov Variation |
| 46. I Sinclair vs J Horner |
| 0-1 | 62 | 1975 | British Championship | A10 English |
| 47. N J Holloway vs I Sinclair |
| ½-½ | 22 | 1975 | British Championship | D60 Queen's Gambit Declined, Orthodox Defense |
| 48. I Sinclair vs D B Pritchard |
| 1-0 | 26 | 1975 | British Championship | A30 English, Symmetrical |
| 49. I Sinclair vs D Kilgour |
| 0-1 | 37 | 1976 | Scottish Championship | A07 King's Indian Attack |
| 50. N A Gordon vs I Sinclair |
| 0-1 | 35 | 1976 | Scottish Championship | B14 Caro-Kann, Panov-Botvinnik Attack |
Kibitzing
