| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. O Jackson vs M J Freeman |
| 0-1 | 28 |
1980 |
Benedictine | B18 Caro-Kann, Classical |
| 2. O Jackson vs P Clarke |
| 0-1 | 23 |
1981 |
GB-ch Morec | C33 King's Gambit Accepted |
| 3. Hartston vs O Jackson |
| 1-0 | 40 |
1981 |
BCF-ch | A48 King's Indian |
| 4. R Nokes vs O Jackson |
| 1-0 | 41 |
1981 |
BCF-ch | B43 Sicilian, Kan, 5.Nc3 |
| 5. O Jackson vs Flear |
| ½-½ | 32 |
1987 |
England | C30 King's Gambit Declined |
| 6. G Timoshchenko vs O Jackson |
| 1-0 | 31 |
1990 |
Hastings Challengers 9091 | A52 Budapest Gambit |
| 7. G Timoshchenko vs O Jackson |
 | 1-0 | 20 |
1991 |
Hastings Challengers 9192 | A52 Budapest Gambit |
| 8. O Jackson vs T Rahman |
| 1-0 | 35 |
1991 |
Ch Great Britain, Great Britai | C33 King's Gambit Accepted |
| 9. O Jackson vs Adams |
| 0-1 | 31 |
1991 |
Sheffield | C33 King's Gambit Accepted |
| 10. O Jackson vs J Rowson |
| 0-1 | 53 |
1992 |
Great Britian-ch | C33 King's Gambit Accepted |
| 11. Hebden vs O Jackson |
| 1-0 | 40 |
1995 |
British ch | A46 Queen's Pawn Game |
| 12. R Palliser vs O Jackson |
| 1-0 | 39 |
1999 |
Ch Great Britain, Scarborough (England) | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 13. O Jackson vs J Rudd |
| 0-1 | 42 |
1999 |
Ch Great Britain, Scarborough (England) | C37 King's Gambit Accepted |
| 14. C Waters vs O Jackson |
| ½-½ | 46 |
1999 |
Ch Great Britain, Scarborough (England) | A41 Queen's Pawn Game (with ...d6) |
| 15. O Jackson vs J Gallagher |
| 0-1 | 51 |
1999 |
Ch Great Britain, Scarborough (England) | B23 Sicilian, Closed |
| 16. A Gokhale vs O Jackson |
| 1-0 | 59 |
1999 |
Ch Great Britain, Scarborough (England) | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 17. O Jackson vs P McMahon |
| 1-0 | 22 |
1999 |
Ch Great Britain, Scarborough (England) | C36 King's Gambit Accepted, Abbazia Defense |
| 18. O Jackson vs T Thiruchelvam |
| ½-½ | 30 |
1999 |
Ch Great Britain, Scarborough (England) | B18 Caro-Kann, Classical |
| 19. C Storey vs O Jackson |
| 1-0 | 37 |
1999 |
Ch Great Britain, Scarborough (England) | B40 Sicilian |
| 20. S Scannell vs O Jackson |
| 1-0 | 38 |
1999 |
Ch Great Britain, Scarborough (England) | A57 Benko Gambit |
| 21. O Jackson vs L Lee |
| 1-0 | 27 |
1999 |
Ch Great Britain, Scarborough (England) | B21 Sicilian, 2.f4 and 2.d4 |
| 22. O Jackson vs C Tippleston |
| 1-0 | 43 |
1999 |
Ch Great Britain, Scarborough (England) | B23 Sicilian, Closed |
| 23. O Jackson vs S Haslinger |
| 0-1 | 30 |
2006 |
European Union Individual Championships | C29 Vienna Gambit |
| 24. O Jackson vs M Armstrong |
| ½-½ | 34 |
2006 |
Hastings Chess Congress | C11 French |
| 25. M Karttunen vs O Jackson |
| 1-0 | 24 |
2006 |
European Union Individual Championships | D08 Queen's Gambit Declined, Albin Counter Gambit |