| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. K Mahdy vs M Nielsen |
| 1-0 | 32 | 1992 | Oberwart Open | C47 Four Knights |
| 2. A Stummer vs M Nielsen |
| 1-0 | 48 | 1992 | Oberwart Open | A04 Reti Opening |
| 3. M Nielsen vs W Haag |
| 0-1 | 30 | 1992 | Oberwart Open | B98 Sicilian, Najdorf |
| 4. M Nielsen vs D Zoler |
| ½-½ | 23 | 1993 | Oberwart Open | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 5. M Nielsen vs A Jensen |
| ½-½ | 25 | 1995 | Ringsted op | C32 King's Gambit Declined, Falkbeer Counter Gambit |
| 6. M Nielsen vs J Aagaard |
| ½-½ | 32 | 1995 | Ringsted op | C30 King's Gambit Declined |
| 7. Z Kozul vs M Nielsen |
| 1-0 | 34 | 1995 | Oberwart Open | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 8. M Nielsen vs Z Szymczak |
| 0-1 | 45 | 1995 | Travemuende op | B06 Robatsch |
| 9. C Kamp vs M Nielsen |
| ½-½ | 22 | 1995 | Travemuende op | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 10. M Nielsen vs G Pfeiffer |
| ½-½ | 37 | 1996 | Oberwart Open | B81 Sicilian, Scheveningen, Keres Attack |
| 11. A Karlusch vs M Nielsen |
| ½-½ | 24 | 1996 | Oberwart Open | B33 Sicilian |
| 12. M Nielsen vs T Kamaryt |
| 0-1 | 40 | 1996 | Oberwart Open | C10 French |
| 13. M Nielsen vs E Laschet |
| 1-0 | 27 | 1997 | Oberwart Open | B12 Caro-Kann Defense |
| 14. G Danner vs M Nielsen |
| 1-0 | 41 | 1997 | Oberwart Open | E92 King's Indian |
| 15. M Nielsen vs A Kneutgen |
| 1-0 | 27 | 1997 | Oberwart Open | C10 French |
| 16. W Halser vs M Nielsen |
| ½-½ | 64 | 1997 | Oberwart Open | B30 Sicilian |
| 17. M Nielsen vs P Steinwender |
| 1-0 | 36 | 1997 | Oberwart Open | B93 Sicilian, Najdorf, 6.f4 |
| 18. P Sardy vs M Nielsen |
| ½-½ | 25 | 1997 | Oberwart Open | B33 Sicilian |
| 19. M Nielsen vs M Seifert |
| ½-½ | 13 | 1997 | Oberwart Open | B06 Robatsch |
| 20. B Nagy vs M Nielsen |
| ½-½ | 20 | 1997 | Oberwart Open | B33 Sicilian |
| 21. T Bromann vs M Nielsen |
| 0-1 | 28 | 1998 | Ringsted | B33 Sicilian |
| 22. M Nielsen vs N Lakos |
| 0-1 | 47 | 1999 | Oberwart Open | B32 Sicilian |
| 23. C Seel vs M Nielsen |
| ½-½ | 30 | 1999 | Oberwart Open | A15 English |
| 24. L Zsinka vs M Nielsen |
| 1-0 | 34 | 1999 | Oberwart Open | A57 Benko Gambit |
| 25. M Nielsen vs O Vodep |
| 1-0 | 65 | 1999 | Oberwart Open | C16 French, Winawer |
Kibitzing
