| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. P Gelbenegger vs L Costa |
| 0-1 | 69 | 2021 | TCh-AUT 2nd Mitte -22 | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 2. L Costa vs T O'Gorman |
| ½-½ | 67 | 2022 | 49th NRW Youth Cup | C45 Scotch Game |
| 3. L Costa vs A Bagrationi |
| 0-1 | 44 | 2022 | 49th NRW Youth Cup | B32 Sicilian |
| 4. L Costa vs D Popovic |
| ½-½ | 41 | 2022 | Bundesliga | B92 Sicilian, Najdorf, Opocensky Variation |
| 5. L Costa vs A Braun |
| 0-1 | 25 | 2022 | Bundesliga | B43 Sicilian, Kan, 5.Nc3 |
| 6. L Costa vs A Kukhmazov |
| ½-½ | 27 | 2023 | European Championship | B10 Caro-Kann |
| 7. T Beerdsen vs L Costa |
| 1-0 | 58 | 2023 | European Championship | C53 Giuoco Piano |
| 8. A Gadimbayli vs L Costa |
| 1-0 | 75 | 2023 | European Championship | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 9. J Kosakowski vs L Costa |
| ½-½ | 52 | 2023 | European Championship | B12 Caro-Kann Defense |
| 10. L Costa vs A Kovacevic |
| ½-½ | 38 | 2023 | European Championship | C43 Petrov, Modern Attack |
| 11. N Saraci vs L Costa |
| ½-½ | 44 | 2023 | European Championship | A04 Reti Opening |
| 12. V Dovzhenko vs L Costa |
| 0-1 | 42 | 2023 | Czech Open-A | A00 Uncommon Opening |
| 13. L Costa vs J Vykouk |
| ½-½ | 37 | 2023 | Czech Open-A | B56 Sicilian |
| 14. E Zanan vs L Costa |
| 0-1 | 54 | 2023 | Czech Open-A | B22 Sicilian, Alapin |
| 15. L Costa vs S Das |
| 0-1 | 37 | 2023 | Czech Open-A | B43 Sicilian, Kan, 5.Nc3 |
| 16. P Iniyan vs L Costa |
| ½-½ | 25 | 2023 | Czech Open-A | E41 Nimzo-Indian |
| 17. L Costa vs S Mueer |
| 1-0 | 46 | 2023 | Czech Open-A | B43 Sicilian, Kan, 5.Nc3 |
| 18. J Kosakowski vs L Costa |
| 1-0 | 34 | 2023 | Czech Open-A | D02 Queen's Pawn Game |
| 19. N Mohota vs L Costa |
| 0-1 | 55 | 2023 | Czech Open-A | C45 Scotch Game |
| 20. N Hercegovac vs L Costa |
| ½-½ | 54 | 2023 | Spilimbergo Open | B12 Caro-Kann Defense |
| 21. J Boder vs L Costa |
| ½-½ | 40 | 2023 | Spilimbergo Open | A13 English |
| 22. L Costa vs L Ballotti |
| 1-0 | 60 | 2023 | Spilimbergo Open | C02 French, Advance |
| 23. V Cina vs L Costa |
| 0-1 | 56 | 2023 | Spilimbergo Open | A06 Reti Opening |
| 24. L Costa vs J G Cardoso Cardoso |
| 0-1 | 36 | 2023 | Spilimbergo Open | B90 Sicilian, Najdorf |
| 25. J Kozlovic vs L Costa |
| ½-½ | 59 | 2023 | Spilimbergo Open | D35 Queen's Gambit Declined |
Kibitzing
