25 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Halldorsson, Jon Arni | Ernisson, Petur Ulfar | 1/2-1/2 | A48 | Haustmót TR 2026 | 2026-09-20 |
| Halldorsson, Jon Arni | Omarsson, Josef | 0-1 | A48 | Haustmót TR 2026 | 2026-09-19 |
| Halldorsson, Jon Arni | Leosson, Haukur Vidis | 1-0 | D30 | Haustmót TR 2026 | 2026-09-19 |
| Halldorsson, Jon Arni | Einarsson, Halldor Gretar | 0-1 | E62 | Haustmót TR 2026 | 2026-09-04 |
| Halldorsson, Jon Arni | Merdinyan, Bozhidar | 1-0 | A43 | 6th Haralampi Vanev Memorial â Open Rapid 2026 15.08.2026 | 2026-08-15 |
| Halldorsson, Jon Arni | Den Roover, Nikolay Jorgensen | 1/2-1/2 | A57 | 39th European Chess Club Cup | 2024-10-25 |
| Halldorsson, Jon Arni | Cassidy, John | 1-0 | A60 | 39th European Chess Club Cup | 2024-10-24 |
| Halldorsson, Jon Arni | Einarsson, Halldor Gretar | 0-1 | A48 | Icelandic Team Championship | 2022-10-16 |
| Halldorsson, Jon Arni | Hansen, Soren Bech | 1/2-1/2 | A81 | Icelandic Team Championship | 2022-10-15 |
| Halldorsson, Jon Arni | Arngrimsson, Dagur | 0-1 | D45 | Icelandic Team Championship | 2022-10-14 |
| Halldorsson, Jon Arni | Omarsson, Josef | 1-0 | A77 | European Individual Chess Championship 2021 - Reykjavik Open | 2021-09-02 |
| Halldorsson, Jon Arni | Patt, Zafrir | 1-0 | E32 | European Individual Chess Championship 2021 - Reykjavik Open | 2021-08-31 |
| Halldorsson, Jon Arni | Krastev, Alexander | 0-1 | A46 | European Individual Chess Championship 2021 - Reykjavik Open | 2021-08-28 |
| Halldorsson, Jon Arni | Sivuk, Vitaly | 0-1 | A49 | European Individual Chess Championship 2021 - Reykjavik Open | 2021-08-26 |