| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M B Kalinin vs M Dehn |
| 1-0 | 39 | 1993 | Wichern Open | C16 French, Winawer |
| 2. B Sack vs M Dehn |
| 1-0 | 40 | 1993 | Wichern Open | A04 Reti Opening |
| 3. M Dehn vs M Voigt |
| 0-1 | 45 | 1993 | Wichern Open | D02 Queen's Pawn Game |
| 4. M Dehn vs D Ciornei |
| 1-0 | 29 | 1993 | Wichern Open | A48 King's Indian |
| 5. I Starostits vs M Dehn |
| 1-0 | 30 | 2005 | Goch op | B00 Uncommon King's Pawn Opening |
| 6. F De Gleria vs M Dehn |
| 1-0 | 39 | 2008 | Goch (open) | C45 Scotch Game |
| 7. D Brandenburg vs M Dehn |
| 0-1 | 56 | 2008 | Groningen Open-A | B01 Scandinavian |
| 8. M Dehn vs G Rohit |
| 0-1 | 78 | 2008 | Groningen Open-A | A45 Queen's Pawn Game |
| 9. M Otte vs M Dehn |
| 0-1 | 43 | 2008 | Groningen Open-A | C23 Bishop's Opening |
| 10. M Dehn vs A Bitalzadeh |
| 0-1 | 59 | 2008 | Groningen Open-A | A45 Queen's Pawn Game |
| 11. M Bensdorp-De Labaca vs M Dehn |
| 1-0 | 25 | 2008 | Groningen Open-A | D31 Queen's Gambit Declined |
| 12. M Dehn vs A Clemens |
| ½-½ | 19 | 2008 | Groningen Open-A | D00 Queen's Pawn Game |
| 13. J Vogel vs M Dehn |
| ½-½ | 23 | 2008 | Groningen Open-A | D45 Queen's Gambit Declined Semi-Slav |
| 14. S Kuipers vs M Dehn |
| 1-0 | 45 | 2008 | Groningen Open-A | B01 Scandinavian |
| 15. M Dehn vs N Bijlsma |
| 0-1 | 42 | 2008 | Groningen Open-A | A43 Old Benoni |
| 16. H Poetsch vs M Dehn |
| 1-0 | 25 | 2010 | Schaakfestival Open A | B06 Robatsch |
| 17. M Dehn vs S Kuipers |
| 0-1 | 41 | 2011 | Groningen Open-A | B23 Sicilian, Closed |
| 18. B Pel vs M Dehn |
 | 1-0 | 25 | 2011 | Groningen Open-A | A00 Uncommon Opening |
| 19. M Dehn vs J Hummel |
| 1-0 | 43 | 2011 | Groningen Open-A | A07 King's Indian Attack |
| 20. K Nuri vs M Dehn |
| 1-0 | 37 | 2011 | Groningen Open-A | B15 Caro-Kann |
| 21. M Dehn vs E Sparenberg |
| 0-1 | 53 | 2011 | Groningen Open-A | C55 Two Knights Defense |
| 22. R Rietveld vs M Dehn |
| 1-0 | 52 | 2011 | Groningen Open-A | B15 Caro-Kann |
| 23. S Kappus vs M Dehn |
| ½-½ | 48 | 2011 | Groningen Open-A | B06 Robatsch |
| 24. M Dehn vs I Maris |
| 0-1 | 35 | 2011 | Groningen Open-A | B20 Sicilian |
| 25. V Baghdasaryan vs M Dehn |
| 1-0 | 48 | 2012 | Groningen Open | B07 Pirc |
Kibitzing
