Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. Carlsen vs H Willumsen |
  | 1-0 | 31 | 2004 | Politiken Cup | C18 French, Winawer |
2. A Ertbjerg vs H Willumsen |
| 0-1 | 27 | 2005 | Politiken Cup | A07 King's Indian Attack |
3. M Frank-Nielsen vs H Willumsen |
| 0-1 | 29 | 2005 | Politiken Cup | B50 Sicilian |
4. H Willumsen vs E D Agdestein |
| 0-1 | 26 | 2005 | Politiken Cup | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
5. H Willumsen vs M Ferreiro Calvo |
| 1-0 | 27 | 2005 | Politiken Cup | B82 Sicilian, Scheveningen |
6. H Willumsen vs Chandler |
| 0-1 | 33 | 2005 | Politiken Cup | B32 Sicilian |
7. T Skovgaard vs H Willumsen |
| 0-1 | 34 | 2005 | Politiken Cup | B70 Sicilian, Dragon Variation |
8. H Willumsen vs T Struch |
| 1-0 | 35 | 2005 | Politiken Cup | B45 Sicilian, Taimanov |
9. L Schandorff vs H Willumsen |
| 1-0 | 36 | 2005 | Politiken Cup | D11 Queen's Gambit Declined Slav |
10. H Willumsen vs H Frisk |
| ½-½ | 41 | 2005 | Politiken Cup | C63 Ruy Lopez, Schliemann Defense |
11. C Norton vs H Willumsen |
| ½-½ | 29 | 2005 | Politiken Cup | D02 Queen's Pawn Game |
12. H Willumsen vs B O Pedersen |
 | 1-0 | 17 | 2006 | Politiken Cup | B29 Sicilian, Nimzovich-Rubinstein |
13. D Boros vs H Willumsen |
| 1-0 | 28 | 2006 | Politiken Cup | B77 Sicilian, Dragon, Yugoslav Attack |
14. H Willumsen vs M Nielsen |
| 1-0 | 29 | 2006 | Politiken Cup | B03 Alekhine's Defense |
15. Vaganian vs H Willumsen |
| 1-0 | 38 | 2006 | Politiken Cup | A07 King's Indian Attack |
16. H Willumsen vs N Kirkegaard |
| 1-0 | 88 | 2006 | Politiken Cup | B33 Sicilian |
17. J Christensen vs H Willumsen |
| 1-0 | 33 | 2006 | Politiken Cup | D10 Queen's Gambit Declined Slav |
18. H Willumsen vs F Urkedal |
| 1-0 | 31 | 2006 | Politiken Cup | B96 Sicilian, Najdorf |
19. F Jaeger vs H Willumsen |
| 0-1 | 30 | 2006 | Politiken Cup | D44 Queen's Gambit Declined Semi-Slav |
20. H Willumsen vs T I Bratteteig |
| 1-0 | 30 | 2013 | Politiken Cup | B18 Caro-Kann, Classical |
21. H Willumsen vs T Garberg |
| 0-1 | 44 | 2013 | Politiken Cup | B40 Sicilian |
22. K Bulski vs H Willumsen |
| 1-0 | 29 | 2013 | Politiken Cup | D30 Queen's Gambit Declined |
23. M Nilsen vs H Willumsen |
| 1-0 | 30 | 2013 | Politiken Cup | B22 Sicilian, Alapin |
24. H Willumsen vs M Kyrkjebo |
| 1-0 | 34 | 2013 | Politiken Cup | C78 Ruy Lopez |
25. R Saetre vs H Willumsen |
| 0-1 | 32 | 2013 | Politiken Cup | C05 French, Tarrasch |