| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. I Sinclair vs P Uylings |
| 1-0 | 30 | 1970 | Glorney Cup | B29 Sicilian, Nimzovich-Rubinstein |
| 2. S Saverymuttu vs I Sinclair |
| ½-½ | 45 | 1970 | Glorney Cup | B48 Sicilian, Taimanov Variation |
| 3. I Sinclair vs D Bray |
| 1-0 | 29 | 1970 | Glorney Cup | B33 Sicilian |
| 4. J Hanau vs I Sinclair |
| 1-0 | 41 | 1970 | Glorney Cup | B22 Sicilian, Alapin |
| 5. I Sinclair vs F O'Donohoe |
| ½-½ | 37 | 1970 | Glorney Cup | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 6. Keene vs I Sinclair |
| 1-0 | 27 | 1971 | clock simul | D02 Queen's Pawn Game |
| 7. J Matos vs I Sinclair |
| ½-½ | 31 | 1972 | World Student Team Championship Final-B | D02 Queen's Pawn Game |
| 8. I Sinclair vs Speelman |
| 1-0 | 56 | 1972 | Glorney Cup | A26 English |
| 9. B Kernan vs I Sinclair |
| ½-½ | 16 | 1973 | Glasgow | B01 Scandinavian |
| 10. R Devenney vs I Sinclair |
| 0-1 | 40 | 1974 | Mulcahy | A07 King's Indian Attack |
| 11. J Noone vs I Sinclair |
| 0-1 | 29 | 1974 | Mulcahy | B44 Sicilian |
| 12. I Sinclair vs D Blair |
| 1-0 | 32 | 1974 | Mulcahy | A04 Reti Opening |
| 13. P Byrne vs I Sinclair |
| 0-1 | 27 | 1974 | Mulcahy | B44 Sicilian |
| 14. I Sinclair vs S Galligan |
| 1-0 | 80 | 1974 | Mulcahy | A13 English |
| 15. I Sinclair vs B Kernan |
| ½-½ | 14 | 1974 | Mulcahy | B01 Scandinavian |
| 16. A Ornstein vs I Sinclair |
| 1-0 | 26 | 1974 | World Student Team Championship qual-2 | B14 Caro-Kann, Panov-Botvinnik Attack |
| 17. I Sinclair vs R Meulders |
| 1-0 | 52 | 1974 | World Student Team Championship qual-2 | B22 Sicilian, Alapin |
| 18. L Vadasz vs I Sinclair |
| 1-0 | 62 | 1974 | World Student Team Championship qual-2 | A13 English |
| 19. I Sinclair vs W Wittmann |
| ½-½ | 50 | 1974 | World Student Team Championship qual-2 | C80 Ruy Lopez, Open |
| 20. N J Holloway vs I Sinclair |
| ½-½ | 22 | 1974 | British Championship | E04 Catalan, Open, 5.Nf3 |
| 21. I Sinclair vs M Stean |
 | ½-½ | 49 | 1974 | British Championship | A22 English |
| 22. R Thomas vs I Sinclair |
| ½-½ | 37 | 1974 | British Championship | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 23. I Sinclair vs J Mestel |
| 0-1 | 39 | 1974 | British Championship | A07 King's Indian Attack |
| 24. J Penrose vs I Sinclair |
| ½-½ | 30 | 1974 | British Championship | B14 Caro-Kann, Panov-Botvinnik Attack |
| 25. I Sinclair vs P H Clarke |
| 1-0 | 67 | 1974 | British Championship | A13 English |
Kibitzing
