| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. C Pieper-Emden vs R Mainka |
| 1-0 | 77 | 1981 | FRG-ch U20 | A59 Benko Gambit |
| 2. U Waagener vs R Mainka |
| 0-1 | 31 | 1985 | BL2-West 8586 | B81 Sicilian, Scheveningen, Keres Attack |
| 3. R Mainka vs K Goehring |
| 1-0 | 29 | 1986 | BL2-West 8687 | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 4. R Mainka vs L Cserna |
| 1-0 | 29 | 1986 | Dortmund Open | B90 Sicilian, Najdorf |
| 5. R Mainka vs P Ostermeyer |
| ½-½ | 55 | 1986 | Dortmund Open | B90 Sicilian, Najdorf |
| 6. U Kottke vs R Mainka |
| 1-0 | 37 | 1986 | Dortmund Open | A58 Benko Gambit |
| 7. R Mainka vs R Weisshaupt |
| 1-0 | 42 | 1986 | Dortmund Open | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 8. R Mainka vs R Borngaesser |
| 1-0 | 24 | 1987 | BL2-W 8788 | C16 French, Winawer |
| 9. R Mainka vs I Morovic Fernandez |
| ½-½ | 44 | 1987 | Lugano Open | C89 Ruy Lopez, Marshall |
| 10. R Mainka vs A Hoffmann |
| 1-0 | 23 | 1987 | Lugano Open | B90 Sicilian, Najdorf |
| 11. B Kohlweyer vs R Mainka |
| ½-½ | 42 | 1987 | Dortmund-B | A17 English |
| 12. G Moser vs R Mainka |
| ½-½ | 31 | 1987 | Graz Open | A57 Benko Gambit |
| 13. R Kraut vs R Mainka |
| ½-½ | 52 | 1987 | Graz Open | A21 English |
| 14. R Mainka vs N Beraha |
| 0-1 | 30 | 1987 | Graz Open | C97 Ruy Lopez, Closed, Chigorin |
| 15. Hort vs R Mainka |
| 1-0 | 42 | 1988 | Dortmund-A | A46 Queen's Pawn Game |
| 16. R Mainka vs C Hansen |
| 0-1 | 20 | 1988 | Dortmund-A | B81 Sicilian, Scheveningen, Keres Attack |
| 17. M Wilder vs R Mainka |
| 0-1 | 46 | 1988 | Dortmund-A | A15 English |
| 18. J Pinter vs R Mainka |
| 1-0 | 41 | 1988 | Dortmund-A | A57 Benko Gambit |
| 19. V Eingorn vs R Mainka |
| 1-0 | 50 | 1988 | Dortmund-A | E15 Queen's Indian |
| 20. S Kindermann vs R Mainka |
| 1-0 | 39 | 1988 | Dortmund-A | C78 Ruy Lopez |
| 21. R Mainka vs H Olafsson |
| 0-1 | 40 | 1988 | Dortmund-A | B80 Sicilian, Scheveningen |
| 22. R Mainka vs P Popovic |
| 1-0 | 38 | 1988 | Dortmund-A | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 23. R Mainka vs Lputian |
| 0-1 | 30 | 1988 | Dortmund-A | B32 Sicilian |
| 24. D King vs R Mainka |
| 0-1 | 48 | 1988 | Dortmund-A | B23 Sicilian, Closed |
| 25. R Kuczynski vs R Mainka |
| ½-½ | 30 | 1988 | Biel (Switzerland) | C55 Two Knights Defense |
Kibitzing
