9 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Kostov, Rubin | Matejka, Simon | 0-1 | A10 | EUYCC 2024 - U14 | |
| Kostov, Rubin | Bolla, Zsofia | 1-0 | A13 | EUYCC 2025 - U14 | |
| Kostov, Rubin | Mojzisova, Barbora | 1/2-1/2 | A22 | EUYCC 2025 - U14 | |
| Kostov, Rubin | Rzadkowska, Kaja | 0-1 | A23 | EUYCC 2025 - U14 |