| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Diekstra vs O Jakobsen |
| 1-0 | 51 |
1961 |
The Hague | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 2. O Jakobsen vs A Hollis |
| 1-0 | 52 |
1961 |
WchT U26 08th | E67 King's Indian, Fianchetto |
| 3. O Jakobsen vs Bagirov |
| 0-1 | 21 |
1961 |
Helsinki | C18 French, Winawer |
| 4. O Jakobsen vs W Schmidt |
| ½-½ | 86 |
1961 |
Wch U20 prel-A | B86 Sicilian, Fischer-Sozin Attack |
| 5. Larsen vs O Jakobsen |
| 1-0 | 38 |
1963 |
DEN-ch | A07 King's Indian Attack |
| 6. M Janata vs O Jakobsen |
| ½-½ | 44 |
1964 |
Zurich - jungmeister | A15 English |
| 7. O Jakobsen vs C Zuidema |
| 1-0 | 28 |
1964 |
Zurich - jungmeister | E12 Queen's Indian |
| 8. O Jakobsen vs G Lee |
| 1-0 | 41 |
1964 |
Zurich - jungmeister | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 9. H Pfleger vs O Jakobsen |
| ½-½ | 41 |
1964 |
Zurich - jungmeister | A56 Benoni Defense |
| 10. E Eichhorn vs O Jakobsen |
| 1-0 | 59 |
1964 |
Zurich - jungmeister | B36 Sicilian, Accelerated Fianchetto |
| 11. Larsen vs O Jakobsen |
| 1-0 | 26 |
1964 |
DEN-ch | B21 Sicilian, 2.f4 and 2.d4 |
| 12. O Jakobsen vs H Glauser |
| 1-0 | 36 |
1964 |
Zurich - jungmeister | D03 Torre Attack (Tartakower Variation) |
| 13. F Tejero-Royo vs O Jakobsen |
| ½-½ | 44 |
1964 |
Zurich - jungmeister | B22 Sicilian, Alapin |
| 14. O Jakobsen vs Kurajica |
| 1-0 | 68 |
1964 |
Zurich - jungmeister | B40 Sicilian |
| 15. O Jakobsen vs O Kinnmark |
| 0-1 | 35 |
1964 |
Zurich - jungmeister | A00 Uncommon Opening |
| 16. H Holaszek vs O Jakobsen |
| 0-1 | 35 |
1964 |
Zurich - jungmeister | B84 Sicilian, Scheveningen |
| 17. Hort vs O Jakobsen |
| ½-½ | 37 |
1965 |
Copenhagen | A56 Benoni Defense |
| 18. Larsen vs O Jakobsen |
| 1-0 | 84 |
1965 |
Copenhagen | B21 Sicilian, 2.f4 and 2.d4 |
| 19. O Jakobsen vs Gligoric |
| ½-½ | 40 |
1965 |
Copenhagen | A26 English |
| 20. O Jakobsen vs Ujtelky |
| 0-1 | 25 |
1965 |
Copenhagen | A43 Old Benoni |
| 21. Taimanov vs O Jakobsen |
| 1-0 | 33 |
1965 |
Copenhagen | A56 Benoni Defense |
| 22. Suetin vs O Jakobsen |
| 1-0 | 49 |
1965 |
Copenhagen (Denmark) | B60 Sicilian, Richter-Rauzer |
| 23. G Israel vs O Jakobsen |
| 1-0 | 39 |
1966 |
Orebro Stud olm fA | B25 Sicilian, Closed |
| 24. O Jakobsen vs Smejkal |
| ½-½ | 42 |
1966 |
Orebro Stud olm fA | D79 Neo-Grunfeld, 6.O-O, Main line |
| 25. O Jakobsen vs A Kapengut |
| 0-1 | 41 |
1966 |
Orebro Stud olm fA | B30 Sicilian |