| Jun 6, 2026 | Karlsson | 0–1 | Bjornsson | Skákþing Íslands - Áskorendaflokkur 2026 | English Opening: King's English Variation | |
| Jun 5, 2026 | Thorsteinsson | ½–½ | Karlsson | Skákþing Íslands - Áskorendaflokkur 2026 | Scandinavian Defense: Mieses-Kotroc Variation | |
| Jun 4, 2026 | Karlsson | 0–1 | Birkisson | Skákþing Íslands - Áskorendaflokkur 2026 | Semi-Slav Defense: Chigorin Defense | |
| Jun 3, 2026 | Leosson | 0–1 | Karlsson | Skákþing Íslands - Áskorendaflokkur 2026 | Queen's Gambit Declined: Cambridge Springs Defense, Bogoljubow Variation | |
| Jun 1, 2026 | Hallmundarson | 1–0 | Karlsson | Skákþing Íslands - Áskorendaflokkur 2026 | Sicilian Defense: Kan Variation, Wing Attack | |
| May 31, 2026 | Karlsson | ½–½ | Omarsson | Skákþing Íslands - Áskorendaflokkur 2026 | English Opening: Anglo-Indian Defense | |
| May 30, 2026 | Brynjarsson | 0–1 | Karlsson | Skákþing Íslands - Áskorendaflokkur 2026 | Sicilian Defense: Godiva Variation | |
| Oct 1, 2023 | Karlsson | 0–1 | Kilic | European Chess Club Cup 2023 | English Opening: Drill Variation | |
| Apr 12, 2022 | Karlsson | 1–0 | Kartsev | ROpen 2022 | English Opening: Anglo-Dutch Defense | |
| Apr 11, 2022 | Hedman | ½–½ | Karlsson | ROpen 2022 | Zukertort Opening | |
| Apr 10, 2022 | Karlsson | 1–0 | Haugen | ROpen 2022 | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Apr 7, 2022 | Fantinel | 1–0 | Karlsson | Reykjavik Open 2022 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Sep 2, 2021 | Karlsson | 1–0 | Hreinsson | European Individual Chess Championship 2021 - Reykjavik Open | English Opening: King's English Variation | |
| Sep 1, 2021 | Fruebing | 1–0 | Karlsson | European Individual Chess Championship 2021 - Reykjavik Open | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Aug 31, 2021 | Karlsson | 1–0 | Tummasarson | European Individual Chess Championship 2021 - Reykjavik Open | Zukertort Opening: Nimzo-Larsen Variation | |
| Aug 30, 2021 | Milikow | 1–0 | Karlsson | European Individual Chess Championship 2021 - Reykjavik Open | Sicilian Defense: Hyperaccelerated Dragon | |
| Aug 29, 2021 | Thorfinnsson | 1–0 | Karlsson | European Individual Chess Championship 2021 - Reykjavik Open | Nimzo-Larsen Attack: English Variation | |
| Aug 28, 2021 | Karlsson | ½–½ | Baltag | European Individual Chess Championship 2021 - Reykjavik Open | Hungarian Opening | |
| Aug 27, 2021 | Sveinbjornsson | 0–1 | Karlsson | European Individual Chess Championship 2021 - Reykjavik Open | Sicilian Defense: Dragon Variation, Modern Bc4 Variation | |
| — | Karlsson | 1–0 | Jonsson | Reykjavik Open 2022 | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | |
| — | Thorfinnsson | 1–0 | Karlsson | ROpen 2022 | Sicilian Defense: Grand Prix Attack | |
