| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. B Andersen vs O Jakobsen |
| 1-0 | 44 | 1964 | Danish Championship | A20 English |
| 27. O Jakobsen vs S Holm |
| 1-0 | 55 | 1964 | Danish Championship | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 28. F Petersen vs O Jakobsen |
| 1-0 | 50 | 1964 | Danish Championship | B80 Sicilian, Scheveningen |
| 29. O Jakobsen vs K Blom |
| 1-0 | 34 | 1964 | Danish Championship | B46 Sicilian, Taimanov Variation |
| 30. B Brinck-Claussen vs O Jakobsen |
| ½-½ | 13 | 1964 | Danish Championship | C71 Ruy Lopez |
| 31. O Jakobsen vs E Pedersen |
| ½-½ | 20 | 1964 | Danish Championship | A46 Queen's Pawn Game |
| 32. E Eichhorn vs O Jakobsen |
| 1-0 | 59 | 1964 | Zurich - jungmeister | B36 Sicilian, Accelerated Fianchetto |
| 33. O Jakobsen vs P N Lee |
| 1-0 | 41 | 1964 | Zurich - jungmeister | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 34. F Tejero Royo vs O Jakobsen |
| ½-½ | 44 | 1964 | Zurich - jungmeister | B22 Sicilian, Alapin |
| 35. O Jakobsen vs O Kinnmark |
| 0-1 | 35 | 1964 | Zurich - jungmeister | A00 Uncommon Opening |
| 36. M Janata vs O Jakobsen |
| ½-½ | 44 | 1964 | Zurich - jungmeister | A15 English |
| 37. H Holaszek vs O Jakobsen |
| 0-1 | 35 | 1964 | Zurich - jungmeister | B84 Sicilian, Scheveningen |
| 38. H Pfleger vs O Jakobsen |
| ½-½ | 41 | 1964 | Zurich - jungmeister | E75 King's Indian, Averbakh, Main line |
| 39. O Jakobsen vs C Zuidema |
| 1-0 | 28 | 1964 | Zurich - jungmeister | E12 Queen's Indian |
| 40. O Jakobsen vs H Glauser |
 | 1-0 | 36 | 1964 | Zurich - jungmeister | D03 Torre Attack (Tartakower Variation) |
| 41. O Jakobsen vs B Kurajica |
| 1-0 | 68 | 1964 | Zurich - jungmeister | A07 King's Indian Attack |
| 42. O Jakobsen vs O Rodriguez Vargas |
| 0-1 | 41 | 1964 | Tel Aviv Olympiad qual-7 | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 43. O Jakobsen vs R Baxter |
| 1-0 | 29 | 1964 | Tel Aviv Olympiad Final-B | C05 French, Tarrasch |
| 44. O Jakobsen vs M Borja |
| 1-0 | 73 | 1964 | Tel Aviv Olympiad Final-B | B32 Sicilian |
| 45. O Jakobsen vs E Stoeckl |
| 1-0 | 32 | 1964 | Tel Aviv Olympiad Final-B | A47 Queen's Indian |
| 46. T Tsagan vs O Jakobsen |
| ½-½ | 41 | 1964 | Tel Aviv Olympiad Final-B | B17 Caro-Kann, Steinitz Variation |
| 47. O Jakobsen vs D Godoy |
| 1-0 | 32 | 1964 | Tel Aviv Olympiad Final-B | A05 Reti Opening |
| 48. O Jakobsen vs A Ottati |
| 0-1 | 88 | 1964 | Tel Aviv Olympiad Final-B | C44 King's Pawn Game |
| 49. E Cobo Arteaga vs O Jakobsen |
| ½-½ | 30 | 1964 | Tel Aviv Olympiad Final-B | E81 King's Indian, Samisch |
| 50. R Cantero vs O Jakobsen |
| ½-½ | 31 | 1964 | Tel Aviv Olympiad Final-B | B40 Sicilian |
Kibitzing
