Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. J Nielsen vs P M Nielsen |
| 1-0 | 20 | 1950 | Nordic Congress, Reykjavik | E60 King's Indian Defense |
2. P M Nielsen vs B Moller |
 | 0-1 | 48 | 1950 | Nordic Congress, Reykjavik | E69 King's Indian, Fianchetto, Classical Main line |
3. B Sundberg vs P M Nielsen |
| 0-1 | 39 | 1950 | Nordic Congress, Reykjavik | D04 Queen's Pawn Game |
4. P M Nielsen vs A Vestol |
| ½-½ | 41 | 1950 | Nordic Congress, Reykjavik | A07 King's Indian Attack |
5. E Gilfer vs P M Nielsen |
| 1-0 | 48 | 1950 | Nordic Congress, Reykjavik | D11 Queen's Gambit Declined Slav |
6. G Sigurdsson vs P M Nielsen |
| 1-0 | 41 | 1950 | Nordic Congress, Reykjavik | C75 Ruy Lopez, Modern Steinitz Defense |
7. P M Nielsen vs O Kinnmark |
| 1-0 | 42 | 1950 | Nordic Congress, Reykjavik | E81 King's Indian, Samisch |
8. S Herseth vs P M Nielsen |
| ½-½ | 61 | 1950 | Nordic Congress, Reykjavik | A16 English |
9. P M Nielsen vs G Agustsson |
| 1-0 | 33 | 1950 | Nordic Congress, Reykjavik | C91 Ruy Lopez, Closed |
10. P M Nielsen vs H Lambert |
| 1-0 | 43 | 1952 | Helsinki Olympiad qual-1 | D50 Queen's Gambit Declined |
11. P M Nielsen vs Milner-Barry |
| ½-½ | 31 | 1952 | Helsinki Olympiad qual-1 | E16 Queen's Indian |
12. J Sajtar vs P M Nielsen |
| 0-1 | 43 | 1952 | Helsinki Olympiad qual-1 | E85 King's Indian, Samisch, Orthodox Variation |
13. P M Nielsen vs L Johnsen |
| ½-½ | 29 | 1952 | Helsinki Olympiad qual-1 | D22 Queen's Gambit Accepted |
14. P M Nielsen vs Bolbochan |
| ½-½ | 20 | 1952 | Helsinki Olympiad qual-1 | D60 Queen's Gambit Declined, Orthodox Defense |
15. P M Nielsen vs W Lange |
| 1-0 | 27 | 1952 | Helsinki Olympiad qual-1 | E62 King's Indian, Fianchetto |
16. J Gonzalez de Vega vs P M Nielsen |
| 1-0 | 40 | 1952 | Helsinki Olympiad qual-1 | E67 King's Indian, Fianchetto |
17. P M Nielsen vs F Planas Garcia |
 | 1-0 | 82 | 1952 | Helsinki Olympiad Final-B | D45 Queen's Gambit Declined Semi-Slav |
18. P M Nielsen vs N Cortlever |
| 0-1 | 42 | 1952 | Helsinki Olympiad Final-B | D90 Grunfeld |
19. F Auer vs P M Nielsen |
| ½-½ | 65 | 1952 | Helsinki Olympiad Final-B | D46 Queen's Gambit Declined Semi-Slav |
20. Sliwa vs P M Nielsen |
| 0-1 | 31 | 1952 | Helsinki Olympiad Final-B | A49 King's Indian, Fianchetto without c4 |
21. W Pietzsch vs P M Nielsen |
| ½-½ | 36 | 1952 | Helsinki Olympiad Final-B | B56 Sicilian |
22. P M Nielsen vs V Nestler |
| ½-½ | 30 | 1952 | Helsinki Olympiad Final-B | B84 Sicilian, Scheveningen |
23. P M Nielsen vs B Larsen |
 | 0-1 | 33 | 1952 | Aarhus - Aalborg match | E41 Nimzo-Indian |
24. B Larsen vs P M Nielsen |
| ½-½ | 105 | 1953 | Danish Championship | E67 King's Indian, Fianchetto |
25. B Larsen vs P M Nielsen |
 | 0-1 | 38 | 1954 | Danish Championship | E76 King's Indian, Four Pawns Attack |