| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. R Pepic vs R Kostadinov |
| 0-1 | 36 | 1990 | Pula Open | B06 Robatsch |
| 2. R Kostadinov vs M Markovic |
| 0-1 | 45 | 1990 | Pula Open | A48 King's Indian |
| 3. R Kostadinov vs I Farago |
| 0-1 | 36 | 1993 | Neuwied op | A15 English |
| 4. V Pantev vs R Kostadinov |
| ½-½ | 19 | 1995 | BUL-ch sf | B08 Pirc, Classical |
| 5. R Kostadinov vs D Komarov |
| 0-1 | 34 | 2009 | Albena op | A46 Queen's Pawn Game |
| 6. G Szabo vs R Kostadinov |
| 1-0 | 34 | 2009 | Kesarovski - Georgiev Mem | B06 Robatsch |
| 7. R Kostadinov vs P Arnaudov |
| ½-½ | 61 | 2009 | Kesarovski - Georgiev Mem | A46 Queen's Pawn Game |
| 8. I Manolov vs R Kostadinov |
| ½-½ | 40 | 2009 | Kesarovski - Georgiev Mem | B06 Robatsch |
| 9. T Sfarlog vs R Kostadinov |
| 0-1 | 49 | 2009 | Kesarovski - Georgiev Mem | A10 English |
| 10. R Kostadinov vs V Pantev |
| 0-1 | 29 | 2009 | Kesarovski - Georgiev Mem | A46 Queen's Pawn Game |
| 11. K Rusev vs R Kostadinov |
| 1-0 | 25 | 2010 | Mem Nino Kirov | A42 Modern Defense, Averbakh System |
| 12. R Kostadinov vs S Davidov |
| ½-½ | 38 | 2010 | Mem Nino Kirov | D02 Queen's Pawn Game |
| 13. K Krastev vs R Kostadinov |
| 0-1 | 38 | 2010 | Mem Nino Kirov | B06 Robatsch |
| 14. R Kostadinov vs J Gantar |
| 1-0 | 66 | 2010 | Mem Nino Kirov | A46 Queen's Pawn Game |
| 15. R Kostadinov vs M Petrov |
| 0-1 | 39 | 2010 | Mem Nino Kirov | A43 Old Benoni |
| 16. E Janev vs R Kostadinov |
| 0-1 | 39 | 2010 | Mem Nino Kirov | B06 Robatsch |
| 17. V Panbukchian vs R Kostadinov |
| ½-½ | 11 | 2010 | Mem Nino Kirov | C68 Ruy Lopez, Exchange |
| 18. R Kostadinov vs P Dimitrov |
| 0-1 | 37 | 2010 | Mem Nino Kirov | A40 Queen's Pawn Game |
| 19. M Gochev vs R Kostadinov |
| 1-0 | 21 | 2010 | Mem Nino Kirov | B06 Robatsch |
| 20. D Nancheva vs R Kostadinov |
| 0-1 | 30 | 2010 | Georgiev - Kesarovski Mem | B06 Robatsch |
| 21. R Kostadinov vs L Filip |
| 0-1 | 58 | 2010 | Georgiev - Kesarovski Mem | A46 Queen's Pawn Game |
| 22. Atanas Mahlev vs R Kostadinov |
| 0-1 | 33 | 2010 | Georgiev - Kesarovski Mem | B06 Robatsch |
| 23. R Kostadinov vs W Koelbl |
| 1-0 | 46 | 2010 | Georgiev - Kesarovski Mem | A15 English |
| 24. G Nikolaou vs R Kostadinov |
| 1-0 | 67 | 2010 | Georgiev - Kesarovski Mem | A06 Reti Opening |
| 25. R Kostadinov vs K Kirchev |
| 1-0 | 38 | 2010 | Georgiev - Kesarovski Mem | A34 English, Symmetrical |
Kibitzing
