| Feb 15, 2026 | Omarsson | 1–0 | Gudnyjarson | Nordisk Mesterskab gruppe C | Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation | |
| Feb 14, 2026 | Gudnyjarson | ½–½ | Bergdahl | Nordisk Mesterskab gruppe C | Catalan Opening: Closed | |
| Feb 14, 2026 | Gudnyjarson | 1–0 | Jakobsen | Nordisk Mesterskab gruppe C | Catalan Opening: Closed | |
| Feb 13, 2026 | Christensen | 0–1 | Gudnyjarson | Nordisk Mesterskab gruppe C | Caro-Kann Defense | |
| Feb 13, 2026 | Gudnyjarson | 0–1 | Jamil | Nordisk Mesterskab gruppe C | Queen's Gambit Declined | |
| Feb 12, 2026 | Bernhoftsen-Banks | 1–0 | Gudnyjarson | Nordisk Mesterskab gruppe C | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Feb 6, 2026 | Gudnyjarson | 1–0 | Fridthjofsdottir | Skákþing Reykjavíkur 2026 | Catalan Opening: Closed | |
| Jan 21, 2026 | Gudnyjarson | 0–1 | Einarsson | Skákþing Reykjavíkur 2026 | Grünfeld Defense: Three Knights Variation, Hungarian Attack | |
| Jan 18, 2026 | Olszewski | 0–1 | Gudnyjarson | Skákþing Reykjavíkur 2026 | Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation | |
| Jan 11, 2026 | Birkisson | 1–0 | Gudnyjarson | Skákþing Reykjavíkur 2026 | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Sep 12, 2025 | Ragnarsson | 1–0 | Gudnyjarson | Haustmot TR 2025 | Queen's Pawn Game: Stonewall Attack | |
| Sep 3, 2025 | Gudnyjarson | 1–0 | Bjornsson | Haustmot TR 2025 | Indian Defense: Budapest Defense, Rubinstein Variation | |
| Sep 3, 2025 | Hardarson | 1–0 | Gudnyjarson | Haustmot TR 2025 | Caro-Kann Defense: Exchange Variation | |
| Sep 3, 2025 | Gudnyjarson | 1–0 | Hermannsson | Haustmot TR 2025 | Queen's Gambit Declined | |
| Sep 3, 2025 | Thorisson | 1–0 | Gudnyjarson | Haustmot TR 2025 | Caro-Kann Defense: Two Knights Attack, Mindeno Variation | |
| Sep 3, 2025 | Gudnyjarson | 1–0 | Heidarsson | Haustmot TR 2025 | Catalan Opening: Open Defense | |
| Sep 3, 2025 | Gudnyjarson | 0–1 | Bergsson | Haustmot TR 2025 | Catalan Opening: Closed | |
| Sep 3, 2025 | Sigurdsson | 1–0 | Gudnyjarson | Haustmot TR 2025 | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Sep 3, 2025 | Gudnyjarson | 0–1 | Skarphedinsson | Haustmot TR 2025 | Catalan Opening: Open Defense, Classical Line | |
| Jun 1, 2024 | Gudnyjarson | 0–1 | Skarphedinsson | Round 1: Gudnyjarson, Sigurdur Pall - Skarphedinsson, Ingvar Wu | Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch | |
| Apr 7, 2022 | Roberts | 1–0 | Gudnyjarson | Kvika Reykjavik Open 2022 | English Opening: Symmetrical Variation, Fianchetto Variation | |
| Apr 6, 2022 | Gudnyjarson | 0–1 | Mitra | Kvika Reykjavik Open 2022 | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Sep 2, 2021 | Gudnyjarson | 0–1 | Kjartansson | European Individual Chess Championship 2021 - Reykjavik Open | Benko Gambit Accepted: Fully Accepted Variation | |
| Sep 1, 2021 | Tummasarson | 1–0 | Gudnyjarson | European Individual Chess Championship 2021 - Reykjavik Open | French Defense: Tarrasch Variation, Closed Variation | |
| Aug 31, 2021 | Gudnyjarson | 0–1 | Koellner | European Individual Chess Championship 2021 - Reykjavik Open | Slav Defense: Czech Variation | |
| Aug 30, 2021 | Moller | 0–1 | Gudnyjarson | European Individual Chess Championship 2021 - Reykjavik Open | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Aug 29, 2021 | Gudnyjarson | 0–1 | Halldorsson | European Individual Chess Championship 2021 - Reykjavik Open | Dutch Defense: Queen's Knight Variation | |
| Aug 28, 2021 | Ingason | ½–½ | Gudnyjarson | European Individual Chess Championship 2021 - Reykjavik Open | Bogo-Indian Defense: Nimzowitsch Variation | |
| Aug 27, 2021 | Gudnyjarson | 0–1 | Ptacnikova | European Individual Chess Championship 2021 - Reykjavik Open | Wade Defense | |
| Aug 26, 2021 | Vogel | 1–0 | Gudnyjarson | European Individual Chess Championship 2021 - Reykjavik Open | Bogo-Indian Defense: Grünfeld Variation | |
| — | Gudnyjarson | ½–½ | Li | Nordic Youth Chess Championship | Slav Defense: Modern Line | |
| — | Gudnyjarson | 1–0 | Jamil | Nordic Youth Chess Championship | Queen's Pawn Game: Veresov Attack, Dutch System | |
| — | Gudnyjarson | 1–0 | Jamil | Nordic Youth Chess Championship | Queen's Gambit Declined | |
| — | Heino | 1–0 | Gudnyjarson | Nordic Youth Chess Championship | Caro-Kann Defense: Advance Variation, Tal Variation | |
| — | Tripathi | 1–0 | Gudnyjarson | Nordic Youth Chess Championship | Bogo-Indian Defense: Retreat Variation | |
| — | Walgren | 1–0 | Gudnyjarson | Nordic Youth Chess Championship | Caro-Kann Defense: Tartakower Variation | |
