| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. D Sondermann vs T Hillarp Persson |
| 1-0 | 40 | 1999 | Sueder Sommer Open | E97 King's Indian |
| 2. R Woller vs D Sondermann |
| ½-½ | 27 | 1999 | Sueder Sommer Open | A80 Dutch |
| 3. D Sondermann vs J Bock |
| ½-½ | 35 | 1999 | Sueder Sommer Open | A57 Benko Gambit |
| 4. D Sondermann vs P Trzaska |
| 0-1 | 33 | 1999 | Sueder Sommer Open | D02 Queen's Pawn Game |
| 5. F Eggenstein vs D Sondermann |
| ½-½ | 51 | 1999 | Sueder Sommer Open | C02 French, Advance |
| 6. D Sondermann vs A Ljuboschiz |
| 1-0 | 41 | 1999 | Sueder Sommer Open | E97 King's Indian |
| 7. D Saavedra vs D Sondermann |
| ½-½ | 34 | 1999 | Sueder Sommer Open | C15 French, Winawer |
| 8. R Wagner vs D Sondermann |
| 1-0 | 25 | 1999 | Sueder Sommer Open | C02 French, Advance |
| 9. D Sondermann vs U Ritter |
| 1-0 | 24 | 1999 | Sueder Sommer Open | A57 Benko Gambit |
| 10. B Kohlweyer vs D Sondermann |
| 1-0 | 22 | 2000 | Sueder Sommer op 11th | A81 Dutch |
| 11. E Trunz vs D Sondermann |
| 1-0 | 34 | 2001 | Dortmund Open-A | C07 French, Tarrasch |
| 12. D Sondermann vs B Schippan |
| ½-½ | 45 | 2001 | Dortmund Open-A | D07 Queen's Gambit Declined, Chigorin Defense |
| 13. C Regert vs D Sondermann |
| 1-0 | 41 | 2001 | Dortmund Open-A | A87 Dutch, Leningrad, Main Variation |
| 14. D Sondermann vs W Schneider |
| ½-½ | 24 | 2001 | Dortmund Open-A | D85 Grunfeld |
| 15. D Schechter vs D Sondermann |
| ½-½ | 46 | 2001 | Dortmund Open-A | C07 French, Tarrasch |
| 16. D Sondermann vs H W Schmitt |
| 0-1 | 45 | 2001 | Dortmund Open-A | A57 Benko Gambit |
| 17. M Cremers vs D Sondermann |
| 1-0 | 63 | 2001 | Dortmund Open-A | A04 Reti Opening |
| 18. D Sondermann vs C Overbeck |
| 1-0 | 49 | 2001 | Dortmund Open-A | D92 Grunfeld, 5.Bf4 |
| 19. M Torrents Ludewig vs D Sondermann |
| 0-1 | 54 | 2001 | Dortmund Open-A | A07 King's Indian Attack |
| 20. D Sondermann vs W Heinicke |
| 1-0 | 63 | 2001 | Dortmund Open-A | D20 Queen's Gambit Accepted |
| 21. S Zarges vs D Sondermann |
| ½-½ | 10 | 2001 | Dortmund Open-A | A87 Dutch, Leningrad, Main Variation |
| 22. R Stepa vs D Sondermann |
| ½-½ | 14 | 2001 | 12th Süder Sommerpokal | A46 Queen's Pawn Game |
| 23. D Sondermann vs T Halasz |
| 0-1 | 32 | 2001 | 12th Süder Sommerpokal | E04 Catalan, Open, 5.Nf3 |
| 24. K Diebig vs D Sondermann |
| ½-½ | 17 | 2001 | 12th Süder Sommerpokal | E12 Queen's Indian |
| 25. D Sondermann vs M Umansky |
| 0-1 | 29 | 2003 | AR--Q-00002 email | E10 Queen's Pawn Game |
Kibitzing
