| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. O Jackson vs M J Freeman |
| 0-1 | 28 |
1980 |
Benedictine | B18 Caro-Kann, Classical |
| 2. R Nokes vs O Jackson |
| 1-0 | 41 |
1981 |
BCF-ch | B43 Sicilian, Kan, 5.Nc3 |
| 3. O Jackson vs P Clarke |
| 0-1 | 23 |
1981 |
GB-ch Morec | C33 King's Gambit Accepted |
| 4. Hartston vs O Jackson |
| 1-0 | 40 |
1981 |
BCF-ch | A48 King's Indian |
| 5. G Timoshchenko vs O Jackson |
| 1-0 | 31 |
1990 |
Hastings Challengers 9091 | A52 Budapest Gambit |
| 6. G Timoshchenko vs O Jackson |
 | 1-0 | 20 |
1991 |
Hastings Challengers 9192 | A52 Budapest Gambit |
| 7. O Jackson vs Adams |
| 0-1 | 31 |
1991 |
Sheffield | C33 King's Gambit Accepted |
| 8. O Jackson vs J Rowson |
| 0-1 | 53 |
1992 |
Great Britian-ch | C33 King's Gambit Accepted |
| 9. Hebden vs O Jackson |
| 1-0 | 40 |
1995 |
British ch | A46 Queen's Pawn Game |
| 10. O Jackson vs J Rudd |
| 0-1 | 42 |
1999 |
Ch Great Britain, Scarborough (England) | C37 King's Gambit Accepted |
| 11. O Jackson vs J Gallagher |
| 0-1 | 51 |
1999 |
Ch Great Britain, Scarborough (England) | B23 Sicilian, Closed |
| 12. A Gokhale vs O Jackson |
| 1-0 | 59 |
1999 |
Ch Great Britain, Scarborough (England) | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 13. S Scannell vs O Jackson |
| 1-0 | 38 |
1999 |
Ch Great Britain, Scarborough (England) | A57 Benko Gambit |
| 14. C Storey vs O Jackson |
| 1-0 | 37 |
1999 |
Ch Great Britain, Scarborough (England) | B40 Sicilian |
| 15. R Palliser vs O Jackson |
| 1-0 | 39 |
1999 |
Ch Great Britain, Scarborough (England) | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 16. O Jackson vs Galego |
| 0-1 | 36 |
2006 |
European Union Individual Championships | B23 Sicilian, Closed |
| 17. O Jackson vs W Armstrong |
| 0-1 | 37 |
2006 |
European Union Individual Championships | B21 Sicilian, 2.f4 and 2.d4 |
| 18. M Karttunen vs O Jackson |
| 1-0 | 24 |
2006 |
European Union Individual Championships | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 19. J Humphreys vs O Jackson |
| 1-0 | 47 |
2006 |
Hastings Chess Congress | B43 Sicilian, Kan, 5.Nc3 |
| 20. Conquest vs O Jackson |
| 1-0 | 36 |
2006 |
European Union Individual Championships | A04 Reti Opening |
| 21. O Jackson vs S Knott |
| 0-1 | 35 |
2006 |
Hastings Chess Congress | C19 French, Winawer, Advance |
| 22. O Jackson vs S Haslinger |
| 0-1 | 30 |
2006 |
European Union Individual Championships | C29 Vienna Gambit |
| 23. O Jackson vs W Hendriks |
| 0-1 | 30 |
2006 |
Hastings Chess Congress | B23 Sicilian, Closed |
| 24. O Jackson vs S Satyapragyan |
| 0-1 | 34 |
2007 |
83rd Hastings Chess Congress | B23 Sicilian, Closed |
| 25. O Jackson vs Krasenkow |
| 0-1 | 30 |
2007 |
Isle of Man International | B23 Sicilian, Closed |