14 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Mattinson, Kai | Ireland, David J | 0-1 | B02 | Four Nations Chess League Easter Congress 2026 - U2000 | 2026-04-06 |
| Mattinson, Kai | Holmes, Matthew A | 0-1 | B21 | Four Nations Chess League Easter Congress 2026 - U2000 | 2026-04-05 |
| Mattinson, Kai | Kearney, James | 1-0 | C30 | Four Nations Chess League Easter Congress 2026 - U2000 | 2026-04-03 |
| Mattinson, Kai | Zaiarski, Stepan | 0-1 | C29 | exe:Slovakia open Bratislava 25 | 2025-09-21 |
| Mattinson, Kai | Slaba, Andrea | 1-0 | B12 | exe:Slovakia open Bratislava 25 | 2025-09-20 |
| Mattinson, Kai | Sekova, Olivia | 1/2-1/2 | B21 | exe:Slovakia open Bratislava 25 | 2025-09-18 |
| Mattinson, Kai | Dubnicka, Ferdinand | 1-0 | B06 | exe2025 | 2025-09-15 |
| Mattinson, Kai | Sydoryka, Vladyslav | 0-1 | B12 | exe:Slovakia open Bratislava 25 | 2025-09-13 |