23 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Zak, Ondrej | Bartal, Alex | 0-1 | B33 | Skalica 2026 B | 2026-08-30 |
| Zak, Ondrej | Maklakova, Dafne | 1-0 | C44 | Skalica 2026 B | 2026-08-28 |
| Zak, Ondrej | Rehak, Matus | 1/2-1/2 | B28 | Skalica 2026 B | 2026-08-26 |
| Zak, Ondrej | Wallner, Juraj | 0-1 | B40 | Skalica 2026 B | 2026-08-24 |
| Zak, Ondrej | Zilkay, Dominik | 0-1 | B32 | skalicab | 2026-08-22 |
| Zak, Ondrej | Havlu, Jakub | 1-0 | C53 | MÃÂR 2026 Open | 2026-03-14 |
| Zak, Ondrej | Svab, Pavel | 1-0 | B13 | MÃÂR 2026 Open | 2026-03-13 |
| Zak, Ondrej | Zakova, Lenka | 0-1 | B43 | MÃÂR 2026 Open | 2026-03-10 |
| Zak, Ondrej | Broz, Pavel | 0-1 | C54 | MÃÂR 2026 Open | 2026-03-09 |
| Zak, Ondrej | Havlu, Adam | 1-0 | C40 | MÃÂR 2026 Open | 2026-03-08 |
| Zak, Ondrej | Pap, Martin | 1-0 | C57 | Skalica B | |
| Zak, Ondrej | Svorad, Tomas | 0-1 | D53 | Skalica B |