| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Nielsen vs E Sobjerg |
| 0-1 | 48 | 1995 | Copenhagen Open | C57 Two Knights |
| 2. H Petermann vs M Nielsen |
| 1-0 | 62 | 1995 | Copenhagen Open | B03 Alekhine's Defense |
| 3. M Nielsen vs N E Rasmussen |
| 0-1 | 34 | 1995 | Copenhagen Open | B10 Caro-Kann |
| 4. L Fernandez Siles vs M Nielsen |
| 1-0 | 60 | 1995 | Copenhagen Open | A49 King's Indian, Fianchetto without c4 |
| 5. M Nielsen vs D Bogdanov |
| 1-0 | 33 | 1995 | Copenhagen Open | B07 Pirc |
| 6. G Fant vs M Nielsen |
| 1-0 | 25 | 1995 | Copenhagen Open | A57 Benko Gambit |
| 7. M Nielsen vs R Ostergaard |
| ½-½ | 42 | 1995 | Copenhagen Open | B62 Sicilian, Richter-Rauzer |
| 8. E Nicolaisen vs M Nielsen |
| 1-0 | 22 | 1995 | Copenhagen Open | B02 Alekhine's Defense |
| 9. M Nielsen vs T Svendsen |
| 0-1 | 58 | 1995 | Copenhagen Open | C57 Two Knights |
| 10. H Molvig vs M Nielsen |
| 1-0 | 29 | 1995 | Copenhagen Open | A57 Benko Gambit |
| 11. E Gullaksen vs M Nielsen |
| 1-0 | 27 | 1997 | Politiken Cup | B05 Alekhine's Defense, Modern |
| 12. T Bromann vs M Nielsen |
| 0-1 | 34 | 1997 | Politiken Cup | B03 Alekhine's Defense |
| 13. M Nielsen vs B Hansen |
| 0-1 | 30 | 1997 | Politiken Cup | B01 Scandinavian |
| 14. N S Nilsson vs M Nielsen |
| 1-0 | 46 | 1997 | Politiken Cup | B02 Alekhine's Defense |
| 15. M Kaspersen vs M Nielsen |
| ½-½ | 17 | 1997 | Politiken Cup | A57 Benko Gambit |
| 16. M Nielsen vs D Coleman |
| 0-1 | 34 | 1997 | Politiken Cup | B92 Sicilian, Najdorf, Opocensky Variation |
| 17. C Hejberg vs M Nielsen |
| 0-1 | 70 | 1997 | Politiken Cup | A57 Benko Gambit |
| 18. M Nielsen vs J Christensen |
| ½-½ | 43 | 1997 | Politiken Cup | C23 Bishop's Opening |
| 19. F T Naes vs M Nielsen |
| 0-1 | 46 | 1997 | Politiken Cup | B03 Alekhine's Defense |
| 20. T Thorhallsson vs M Nielsen |
| 1-0 | 33 | 1998 | Politiken Cup | B03 Alekhine's Defense |
| 21. M Nielsen vs S T Wilhelmsson |
| 0-1 | 88 | 1998 | Politiken Cup | B71 Sicilian, Dragon, Levenfish Variation |
| 22. P Nielsen vs M Nielsen |
| 0-1 | 48 | 1998 | Politiken Cup | D02 Queen's Pawn Game |
| 23. M Nielsen vs K White |
| 1-0 | 28 | 1998 | Politiken Cup | B71 Sicilian, Dragon, Levenfish Variation |
| 24. A H Kristinsson vs M Nielsen |
| 0-1 | 49 | 1998 | Politiken Cup | B03 Alekhine's Defense |
| 25. M Nielsen vs H Lahlum |
| ½-½ | 25 | 1998 | Politiken Cup | C07 French, Tarrasch |
Kibitzing
