| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Kozlovic vs A Loiacono |
| 1-0 | 48 | 2023 | Spilimbergo Open | B06 Robatsch |
| 2. J Kozlovic vs J G Cardoso Cardoso |
| 0-1 | 33 | 2023 | Spilimbergo Open | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 3. M Campos Gomez vs J Kozlovic |
| 0-1 | 43 | 2023 | Spilimbergo Open | D11 Queen's Gambit Declined Slav |
| 4. A Savanovic vs J Kozlovic |
| ½-½ | 57 | 2023 | Spilimbergo Open | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 5. J Kozlovic vs L Costa |
| ½-½ | 59 | 2023 | Spilimbergo Open | D35 Queen's Gambit Declined |
| 6. D Dvirnyy vs J Kozlovic |
| 1-0 | 31 | 2023 | Spilimbergo Open | B13 Caro-Kann, Exchange |
| 7. J Kozlovic vs S Lopez Rayo |
| 0-1 | 83 | 2023 | Spilimbergo Open | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 8. P Smetana vs J Kozlovic |
| 0-1 | 112 | 2024 | European Youth Championship U16 | C47 Four Knights |
| 9. J Kozlovic vs R Arnold |
| ½-½ | 106 | 2024 | European Youth Championship U16 | C84 Ruy Lopez, Closed |
| 10. R Pashikyan vs J Kozlovic |
| 1-0 | 46 | 2024 | European Youth Championship U16 | D02 Queen's Pawn Game |
| 11. A Menahem vs J Kozlovic |
| ½-½ | 52 | 2024 | European Youth Championship U16 | D32 Queen's Gambit Declined, Tarrasch |
| 12. J Kozlovic vs M Csernyik |
| 1-0 | 31 | 2024 | European Youth Championship U16 | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 13. D C Radu vs J Kozlovic |
| ½-½ | 49 | 2024 | European Youth Championship U16 | C78 Ruy Lopez |
| 14. J Kozlovic vs A Trevisiol |
| ½-½ | 60 | 2024 | European Youth Championship U16 | C78 Ruy Lopez |
| 15. R Vagman vs J Kozlovic |
| ½-½ | 58 | 2024 | European Youth Championship U16 | C70 Ruy Lopez |
| 16. J Kozlovic vs F Dietze |
| 1-0 | 25 | 2024 | Bavarian Open | B31 Sicilian, Rossolimo Variation |
| 17. T Shen vs J Kozlovic |
| 0-1 | 39 | 2024 | Bavarian Open | D32 Queen's Gambit Declined, Tarrasch |
| 18. J Kozlovic vs A Humbert |
| 0-1 | 39 | 2024 | Bavarian Open | B31 Sicilian, Rossolimo Variation |
| 19. L Hofmann vs J Kozlovic |
| 1-0 | 29 | 2024 | Bavarian Open | C45 Scotch Game |
| 20. I Sundac vs J Kozlovic |
| ½-½ | 60 | 2025 | HIT Open-A | D32 Queen's Gambit Declined, Tarrasch |
| 21. J Kozlovic vs E Pirvulescu |
| 1-0 | 28 | 2025 | HIT Open-A | C42 Petrov Defense |
| 22. S Drazic vs J Kozlovic |
| 1-0 | 28 | 2025 | HIT Open-A | D02 Queen's Pawn Game |
| 23. J Kozlovic vs A Basdar |
| 1-0 | 63 | 2025 | HIT Open-A | D44 Queen's Gambit Declined Semi-Slav |
| 24. L G Sprincean vs J Kozlovic |
| 0-1 | 39 | 2025 | HIT Open-A | B12 Caro-Kann Defense |
| 25. J Kozlovic vs M Furlan |
| 0-1 | 50 | 2025 | HIT Open-A | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
Kibitzing
