| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. N M Ostensen vs M Gajcin |
| 0-1 | 43 | 2022 | Norway Chess Open A | A16 English |
| 2. N M Ostensen vs K E Nielsen-Refs |
| 1-0 | 36 | 2022 | Norway Chess Open A | A16 English |
| 3. T Cherniaiev vs N M Ostensen |
| 0-1 | 107 | 2022 | Norway Chess Open A | D12 Queen's Gambit Declined Slav |
| 4. S Melaa vs N M Ostensen |
| 1-0 | 35 | 2022 | Norway Chess Open A | D15 Queen's Gambit Declined Slav |
| 5. N M Ostensen vs Z H Goh |
| 1-0 | 39 | 2022 | Norway Chess Open A | A16 English |
| 6. N M Ostensen vs A Oye-Stromberg |
| ½-½ | 59 | 2022 | Norway Chess Open A | A11 English, Caro-Kann Defensive System |
| 7. N Kistrup vs N M Ostensen |
| 0-1 | 50 | 2022 | Norway Chess Open A | D10 Queen's Gambit Declined Slav |
| 8. L Johansson vs N M Ostensen |
| 1-0 | 33 | 2022 | Fagernes GM Open Aut | D10 Queen's Gambit Declined Slav |
| 9. N M Ostensen vs G Stray |
| 1-0 | 55 | 2022 | Fagernes GM Open Aut | A25 English |
| 10. S Thavandiran vs N M Ostensen |
| 1-0 | 53 | 2022 | Fagernes GM Open Aut | C46 Three Knights |
| 11. N M Ostensen vs J P Ganta |
| 0-1 | 38 | 2022 | Fagernes GM Open Aut | D02 Queen's Pawn Game |
| 12. V B Strand vs N M Ostensen |
| 1-0 | 40 | 2022 | Fagernes GM Open Aut | A45 Queen's Pawn Game |
| 13. N M Ostensen vs A Gronnestad |
| 1-0 | 34 | 2022 | Fagernes GM Open Aut | B13 Caro-Kann, Exchange |
| 14. N M Ostensen vs K R Hansen Westrum |
| 0-1 | 66 | 2022 | Fagernes GM Open Aut | C71 Ruy Lopez |
| 15. E Myagmarsuren vs N M Ostensen |
| 0-1 | 36 | 2022 | Fagernes GM Open Aut | C11 French |
| 16. V Verbin vs N M Ostensen |
| 0-1 | 60 | 2022 | Fagernes GM Open Aut | C78 Ruy Lopez |
| 17. M Weishaeutel vs N M Ostensen |
| 1-0 | 22 | 2022 | Basel Christmas Open | E46 Nimzo-Indian |
| 18. N M Ostensen vs E Zuferi |
| 0-1 | 30 | 2022 | Basel Christmas Open | A28 English |
| 19. E Ohanyan vs N M Ostensen |
| 1-0 | 35 | 2023 | Kragero Resort Chess | E95 King's Indian, Orthodox, 7...Nbd7, 8.Re1 |
| 20. N M Ostensen vs D Ragnarsson |
| 0-1 | 51 | 2023 | Kragero Resort Chess | D45 Queen's Gambit Declined Semi-Slav |
| 21. Y Fossheim vs N M Ostensen |
| 0-1 | 54 | 2023 | Kragero Resort Chess | E94 King's Indian, Orthodox |
| 22. N M Ostensen vs G Hestholm |
| 1-0 | 52 | 2023 | Kragero Resort Chess | A28 English |
| 23. E Doluhanova vs N M Ostensen |
| 1-0 | 54 | 2023 | Kragero Resort Chess | B31 Sicilian, Rossolimo Variation |
| 24. N M Ostensen vs V Verbin |
| 1-0 | 67 | 2023 | Kragero Resort Chess | A13 English |
| 25. M Efroimski vs N M Ostensen |
| 1-0 | 53 | 2023 | Kragero Resort Chess | C42 Petrov Defense |
Kibitzing
