| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. W Wolf vs M Duppel |
| 0-1 | 31 | 1996 | Oberliga Wuert 1996/97 | A01 Nimzovich-Larsen Attack |
| 2. M Duppel vs H Grund |
| ½-½ | 21 | 1997 | Bodensee-Cup | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 3. Kasimdzhanov vs M Duppel |
| 1-0 | 33 | 1997 | Bayern-chI Bank Hofmann 1st | B60 Sicilian, Richter-Rauzer |
| 4. M Duppel vs P Chandler |
| 1-0 | 27 | 1997 | Boeblingen Open | A17 English |
| 5. M Duppel vs P Gerhardt |
| 1-0 | 21 | 1997 | Boeblingen Open | A31 English, Symmetrical, Benoni Formation |
| 6. M Duppel vs A Kozlov |
| 1-0 | 31 | 1997 | Boeblingen Open | D45 Queen's Gambit Declined Semi-Slav |
| 7. M Duppel vs A Schwarz |
| ½-½ | 42 | 1997 | Boeblingen Open | B08 Pirc, Classical |
| 8. G Ginsburg vs M Duppel |
| 1-0 | 32 | 1997 | Boeblingen Open | B57 Sicilian |
| 9. N Miezis vs M Duppel |
| 1-0 | 27 | 1997 | Boeblingen Open | A16 English |
| 10. M Duppel vs A Breier |
| 1-0 | 57 | 1998 | Oberfranken-chT U20 | A04 Reti Opening |
| 11. M Duppel vs F Doettling |
| 0-1 | 29 | 1998 | GER-ch U20 | A14 English |
| 12. M Duppel vs F Doettling |
| ½-½ | 40 | 1998 | Oberfranken-chT U20 | B12 Caro-Kann Defense |
| 13. H Grund vs M Duppel |
| 1-0 | 41 | 1998 | Bodensee-Cup 4th | B30 Sicilian |
| 14. P Haba vs M Duppel |
| 1-0 | 52 | 1998 | Neckar op 2nd | D45 Queen's Gambit Declined Semi-Slav |
| 15. M Duppel vs Balashov |
| ½-½ | 29 | 1998 | Boeblingen Open | E32 Nimzo-Indian, Classical |
| 16. M Duppel vs O Breitschaedel |
| 1-0 | 21 | 1998 | Boeblingen Open | D37 Queen's Gambit Declined |
| 17. M Duppel vs S Brodbeck |
| 1-0 | 37 | 1998 | Boeblingen Open | A15 English |
| 18. M Duppel vs M Damson |
| 1-0 | 26 | 1998 | Boeblingen Open | B12 Caro-Kann Defense |
| 19. M Duppel vs M Kekelidze |
| 0-1 | 41 | 1998 | Boeblingen Open | A64 Benoni, Fianchetto, 11...Re8 |
| 20. S Hirt vs M Duppel |
| 0-1 | 24 | 1998 | Boeblingen Open | A34 English, Symmetrical |
| 21. S Kalinitschew vs M Duppel |
| ½-½ | 44 | 1998 | Boeblingen Open | A46 Queen's Pawn Game |
| 22. H Koch vs M Duppel |
| 0-1 | 64 | 1998 | Boeblingen Open | A30 English, Symmetrical |
| 23. M Scholl vs M Duppel |
| 1-0 | 36 | 1998 | Boeblingen Open | A07 King's Indian Attack |
| 24. M Duppel vs H Kowalski |
| 1-0 | 29 | 1999 | Staufer Open | A00 Uncommon Opening |
| 25. M Duppel vs V Lederle |
| 0-1 | 52 | 1999 | Staufer Open | B08 Pirc, Classical |
Kibitzing
