9 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Klaas, Heiko | Khachaturyan, Konstantin | 1-0 | B18 | DVM U20 2024 | 2024-12-29 |
| Klaas, Heiko | Pomrehn, Ole Magnus | 0-1 | C65 | DVM U20 2024 | 2024-12-29 |
| Heiko Klaas | Yair Parkhov | 0-1 | B06 | Round 1: Heiko Klaas - Yair Parkhov | 2023-08-10 |
| Klaas, Heiko | Maj, Samuel | 0-1 | B23 | Cracovia 2021 B | 2021-12-30 |
| Klaas, Heiko | Slabek, Grzegorz | 1/2-1/2 | B03 | Cracovia 2021 B | 2021-12-28 |