| Apr 27, 2026 | Karason | 0–1 | Ponfilenok | Round 8: Karason, Askell O - Ponfilenok, Vladimir | English Opening: Agincourt Defense | |
| Apr 25, 2026 | Karason | ½–½ | Roos | Round 6: Karason, Askell O - Roos, Jean-Luc | Benoni Defense: Classical Variation | |
| Apr 23, 2026 | Bjerke | 0–1 | Karason | Round 5: Bjerke, Richard - Karason, Askell O | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Apr 22, 2026 | Karason | 1–0 | Ten Hacken | Round 4: Karason, Askell O - Ten Hacken, Jos | Slav Defense: Chebanenko Variation, Advance System | |
| Apr 21, 2026 | Ceschia | ½–½ | Karason | Round 3: Ceschia, Ivano - Karason, Askell O | Ruy Lopez: Morphy Defense, Bayreuth Variation | |
| Apr 19, 2026 | Sielicki | ½–½ | Karason | Round 1: Sielicki, Tomasz - Karason, Askell O | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Mar 25, 2026 | Suleymenov | ½–½ | Karason | Reykjavik Open 2026 | Nimzo-Indian Defense: Normal Variation, Classical Defense | |
| Oct 19, 2025 | Karason | 0–1 | Zanan | Round 1: Karason, Askell O - Zanan, Evgeny | Nimzo-Indian Defense: St. Petersburg Variation, American Variation | |
| Jun 21, 2025 | Karason | 1–0 | Ragnarsson | Icelandic Open 2025 | King's Indian Defense: Averbakh Variation | |
| Jun 20, 2025 | Karason | 1–0 | Bjornsson | Icelandic Open 2025 | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | |
| Jun 20, 2025 | Peycheva | ½–½ | Karason | Icelandic Open 2025 | Catalan Opening: Open Defense | |
| Jun 19, 2025 | Karason | 1–0 | Johannsdottir | Icelandic Open 2025 | Modern Defense: Pseudo-Austrian Attack | |
| Jun 18, 2025 | Gudmundsson | ½–½ | Karason | Icelandic Open 2025 | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Jun 18, 2025 | Karason | ½–½ | Thorhallsson | Icelandic Open 2025 | Bogo-Indian Defense: Nimzowitsch Variation | |
| Jun 16, 2025 | Heimisson | 1–0 | Karason | Icelandic Open 2025 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Nov 2, 2024 | Nunn | 1–0 | Karason | Round 9: Nunn, John D M - Karason, Askell O | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Nov 1, 2024 | Karason | 1–0 | Petschar | Round 8: Karason, Askell O - Petschar, Kurt | Queen's Pawn Game | |
| Oct 29, 2024 | Karason | 0–1 | Pritchett | Round 5: Karason, Askell O - Pritchett, Craig W | English Opening: Symmetrical, Hedgehog, Flexible Formation | |
| Oct 28, 2024 | Chevelevitch | ½–½ | Karason | Round 4: Chevelevitch, Evgueni, Dr. - Karason, Askell O | Sicilian Defense: Richter-Rauzer Variation, Classical Variation | |
| Oct 27, 2024 | Karason | ½–½ | Pomes Marcet | Round 3: Karason, Askell O - Pomes Marcet, Joan | Slav Defense: Czech Variation, Krause Attack | |
| Oct 26, 2024 | Renman | 0–1 | Karason | Round 2: Renman, Nils-Gustaf - Karason, Askell O | Queen's Gambit Declined: Three Knights Variation | |
| Mar 31, 2023 | Karason | * | Omarsson | Reykjavik Open | ? | |
| Oct 4, 2022 | Karason | ½–½ | Stigar | ECCC_22 | Nimzo-Indian Defense: Three Knights Variation | |
| Apr 12, 2022 | Vemparala | ½–½ | Karason | ROpen 2022 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Apr 11, 2022 | Karason | 1–0 | Mirza | ROpen 2022 | Nimzo-Indian Defense: Romanishin Variation | |
| Apr 10, 2022 | Galow | 1–0 | Karason | ROpen 2022 | Indian Defense | |
| Apr 9, 2022 | Karason | 1–0 | Hughes | ROpen 2022 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Sep 2, 2021 | Karason | 1–0 | Tummasarson | European Individual Chess Championship 2021 - Reykjavik Open | Slav Defense: Schlechter Variation | |
| Sep 1, 2021 | Heidarsson | 1–0 | Karason | European Individual Chess Championship 2021 - Reykjavik Open | Nimzo-Indian Defense: Sämisch Variation | |
| Aug 31, 2021 | Karason | ½–½ | Butenandt | European Individual Chess Championship 2021 - Reykjavik Open | Nimzo-Indian Defense: Three Knights Variation | |
| Aug 30, 2021 | Can | 1–0 | Karason | European Individual Chess Championship 2021 - Reykjavik Open | Queen's Indian Defense: Petrosian Variation | |
| Aug 29, 2021 | Karason | 1–0 | Pozimski | European Individual Chess Championship 2021 - Reykjavik Open | Queen's Gambit Accepted: Central Variation, McDonnell Defense | |
| Aug 28, 2021 | Omarsson | 0–1 | Karason | European Individual Chess Championship 2021 - Reykjavik Open | Indian Defense | |
| Aug 27, 2021 | Karason | 0–1 | Jonsson | European Individual Chess Championship 2021 - Reykjavik Open | Semi-Slav Defense: Anti-Moscow Gambit | |
| Aug 26, 2021 | Yilmaz | 1–0 | Karason | European Individual Chess Championship 2021 - Reykjavik Open | Queen's Indian Defense: Fianchetto Variation, Check Variation | |
| — | Karason | ½–½ | Sarkisian | Reykjavik Open 2022 | English Opening: Symmetrical Variation, Hedgehog Defense | |
| — | Karason | 1–0 | Olafsson | Goðinn 20th Anniversary Open | English Opening: Mikenas-Carls Variation | |
| — | Karason | 1–0 | Birgisson | Goðinn 20th Anniversary Open | Benoni Defense: Old Benoni | |
| — | Stefansson | 1–0 | Karason | ROpen 2022 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| — | Heimisson | 1–0 | Karason | Goðinn 20th Anniversary Open | Four Knights Game: Gunsberg Variation | |
| — | Hermannsson | 0–1 | Karason | Goðinn 20th Anniversary Open | Italian Game: Scotch Gambit, Max Lange Attack | |
