| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. H Lahlum vs P Nielsen |
| 1-0 | 34 | 1998 | Politiken Cup | A60 Benoni Defense |
| 2. P Nielsen vs S Kristjansson |
| 0-1 | 35 | 1998 | Politiken Cup | C17 French, Winawer, Advance |
| 3. P Nielsen vs M Nielsen |
| 0-1 | 48 | 1998 | Politiken Cup | D02 Queen's Pawn Game |
| 4. F Zyde vs P Nielsen |
| 1-0 | 35 | 1998 | Politiken Cup | C47 Four Knights |
| 5. P Nielsen vs J B Hansen |
| 1-0 | 26 | 1998 | Politiken Cup | B21 Sicilian, 2.f4 and 2.d4 |
| 6. S Pedersen vs P Nielsen |
| ½-½ | 26 | 1998 | Politiken Cup | C34 King's Gambit Accepted |
| 7. P Nielsen vs K L Karstensen |
| 0-1 | 44 | 1998 | Politiken Cup | E76 King's Indian, Four Pawns Attack |
| 8. A Kinch vs P Nielsen |
| 1-0 | 25 | 1998 | Politiken Cup | B00 Uncommon King's Pawn Opening |
| 9. G Kjartansson vs P Nielsen |
| 0-1 | 44 | 1998 | Politiken Cup | C52 Evans Gambit |
| 10. P Nielsen vs K Osterberg |
| 0-1 | 63 | 1998 | Politiken Cup | A16 English |
| 11. P Nielsen vs M Jorgensen |
| 1-0 | 36 | 1998 | Politiken Cup | D80 Grunfeld |
| 12. P Nielsen vs M Lonborg |
| 0-1 | 29 | 2002 | Politiken Cup | B95 Sicilian, Najdorf, 6...e6 |
| 13. F Casagrande vs P Nielsen |
| 1-0 | 47 | 2002 | Politiken Cup | B22 Sicilian, Alapin |
| 14. P Nielsen vs J H Nielsen |
| 1-0 | 82 | 2002 | Politiken Cup | C50 Giuoco Piano |
| 15. D Jorgensen vs P Nielsen |
| 1-0 | 31 | 2002 | Politiken Cup | D02 Queen's Pawn Game |
| 16. P Nielsen vs D Howe |
| 1-0 | 20 | 2002 | Politiken Cup | C74 Ruy Lopez, Modern Steinitz Defense |
| 17. E Christensen vs P Nielsen |
| 1-0 | 34 | 2002 | Politiken Cup | C57 Two Knights |
| 18. P Nielsen vs N Petersen |
| 0-1 | 51 | 2002 | Politiken Cup | B30 Sicilian |
| 19. P Nielsen vs H Danielsen |
| 0-1 | 61 | 2004 | Copenhagen AS04 Centenary | E12 Queen's Indian |
| 20. S Jensen vs P Nielsen |
| 1-0 | 31 | 2004 | Copenhagen AS04 Centenary | D35 Queen's Gambit Declined |
| 21. P Nielsen vs T Tolstrup |
| 0-1 | 47 | 2004 | Copenhagen AS04 Centenary | E12 Queen's Indian |
| 22. J G Nielsen vs P Nielsen |
| 1-0 | 30 | 2004 | Copenhagen AS04 Centenary | D11 Queen's Gambit Declined Slav |
| 23. P Nielsen vs J H Nielsen |
| 1-0 | 42 | 2004 | Copenhagen AS04 Centenary | C24 Bishop's Opening |
| 24. R H Hasling vs P Nielsen |
| 1-0 | 36 | 2004 | Copenhagen AS04 Centenary | C00 French Defense |
| 25. P Nielsen vs M Nielsen |
| 0-1 | 31 | 2005 | Politiken Cup | A48 King's Indian |
Kibitzing
