| Apr 11, 2026 | Stremavicius | 1–0 | Thorsteinsdottir | 23rd Bangkok Chess Club Open 2026 | English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation | |
| Mar 25, 2026 | Thorsteinsdottir | 0–1 | Tutisani | Reykjavik Open 2026 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 16, 2025 | Thorsteinsdottir | ½–½ | Volvovskiy | Finals Game 2: Thorsteinsdottir, Hallgerdur - Volvovskiy, Yury | Nimzowitsch Defense: Declined Variation | |
| Nov 16, 2025 | Jia | 1–0 | Thorsteinsdottir | Finals Game 1: Jia, Derek - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Classical Variation, Lobron System | |
| Nov 16, 2025 | Maly | 1–0 | Thorsteinsdottir | Semifinals Game 2: Maly, Alexey - Thorsteinsdottir, Hallgerdur | Queen's Indian Defense: Euwe Variation | |
| Nov 16, 2025 | Thorsteinsdottir | 0–1 | Maly | Semifinals Game 1: Thorsteinsdottir, Hallgerdur - Maly, Alexey | Scandinavian Defense: Valencian Variation | |
| Nov 15, 2025 | Graeff | ½–½ | Thorsteinsdottir | Round 10: Graeff, Karl - Thorsteinsdottir, Hallgerdur | Neo-Grünfeld Defense: Exchange Variation | |
| Nov 15, 2025 | Thorsteinsdottir | ½–½ | Saraswat Tushar | Round 9: Thorsteinsdottir, Hallgerdur - Saraswat Tushar | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Nov 15, 2025 | Moskovic | ½–½ | Thorsteinsdottir | Round 8: Moskovic, David M - Thorsteinsdottir, Hallgerdur | King's Indian Attack: Wahls Defense | |
| Nov 15, 2025 | Thorsteinsdottir | 1–0 | Tsichlis | Round 7: Thorsteinsdottir, Hallgerdur - Tsichlis, Georgios | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Nov 15, 2025 | Kimani | 1–0 | Thorsteinsdottir | Round 6: Kimani, Hubert - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Classical Variation, Maróczy Attack | |
| Nov 14, 2025 | Thorsteinsdottir | 0–1 | Breskin | Round 5: Thorsteinsdottir, Hallgerdur - Breskin, Nicklas | Sicilian Defense: Moscow Variation, Sokolsky Variation | |
| Nov 14, 2025 | Saraswat Tushar | 1–0 | Thorsteinsdottir | Round 4: Saraswat Tushar - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Panov Attack, Modern Defense, Mieses Line | |
| Nov 14, 2025 | Thorsteinsdottir | 0–1 | Szamoskozi | Round 3: Thorsteinsdottir, Hallgerdur - Szamoskozi, Gabor | Caro-Kann Defense: Exchange Variation | |
| Nov 14, 2025 | Tsichlis | ½–½ | Thorsteinsdottir | Round 2: Tsichlis, Georgios - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Classical Variation, Lobron System | |
| Nov 14, 2025 | Thorsteinsdottir | 1–0 | Kabugu | Round 1: Thorsteinsdottir, Hallgerdur - Kabugu, Njagi | Italian Game: Hungarian Defense | |
| Oct 19, 2025 | Garifullina | 1–0 | Thorsteinsdottir | Round 1: Garifullina, Leya - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Oct 14, 2025 | Thorsteinsdottir | 1–0 | Zvereva | Round 9: Thorsteinsdottir, Hallgerdur - Zvereva, Marija | Sicilian Defense: Old Sicilian | |
| Oct 12, 2025 | Thorsteinsdottir | 1–0 | Ostensson | Round 7: Thorsteinsdottir, Hallgerdur - Ostensson, Julia | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Oct 10, 2025 | Rutherford | ½–½ | Thorsteinsdottir | Round 6: Rutherford, Kathleen - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Oct 9, 2025 | Thorsteinsdottir | ½–½ | Baginskaite | Round 5: Thorsteinsdottir, Hallgerdur - Baginskaite, Kamile | Sicilian Defense: Delayed Alapin Variation, with d6 | |
| Oct 8, 2025 | Puuska | 0–1 | Thorsteinsdottir | Round 4: Puuska, Heini - Thorsteinsdottir, Hallgerdur | East Indian Defense | |
| Oct 7, 2025 | Thorsteinsdottir | 1–0 | Schloffer | Round 3: Thorsteinsdottir, Hallgerdur - Schloffer, Jasmin-Denise | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Oct 6, 2025 | Ushenina | 1–0 | Thorsteinsdottir | Round 2: Ushenina, Anna - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Oct 5, 2025 | Pavlidou | 0–1 | Thorsteinsdottir | Round 1: Pavlidou, Ekaterini - Thorsteinsdottir, Hallgerdur | Nimzo-Indian Defense: Reshevsky Variation | |
| Sep 22, 2024 | Thorsteinsdottir | 1–0 | Faqeeh | 45th FIDE Women's Chess Olympiad | French Defense: Rubinstein Variation, Blackburne Defense | |
| Sep 21, 2024 | Thorsteinsdottir | 0–1 | Frayna | 45th FIDE Women's Chess Olympiad | Alekhine Defense: Modern Variation, Alburt Variation | |
| Sep 20, 2024 | Thorsteinsdottir | 1–0 | Khantree | 45th FIDE Women's Chess Olympiad | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Sep 19, 2024 | Rodshtein | 1–0 | Thorsteinsdottir | 45th FIDE Women's Chess Olympiad | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Sep 18, 2024 | Saraci | 0–1 | Thorsteinsdottir | 45th FIDE Women's Chess Olympiad | Caro-Kann Defense: Classical Variation | |
| Sep 16, 2024 | Thorsteinsdottir | 1–0 | Milovic | 45th FIDE Women's Chess Olympiad | Sicilian Defense: Kramnik Variation | |
| Sep 14, 2024 | Thorsteinsdottir | ½–½ | Ivekovic | 45th FIDE Women's Chess Olympiad | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Sep 13, 2024 | Efentakis | 0–1 | Thorsteinsdottir | 45th FIDE Women's Chess Olympiad | Caro-Kann Defense | |
| Sep 12, 2024 | Karacsonyi | ½–½ | Thorsteinsdottir | 45th FIDE Women's Chess Olympiad | Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line | |
| Sep 11, 2024 | Thorsteinsdottir | 1–0 | Ganigan | 45th FIDE Women's Chess Olympiad | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Jun 9, 2024 | Jonsson | 1–0 | Thorsteinsdottir | Round 9: Jonsson, Gauti Pall - Thorsteinsdottir, Hallgerdur | Caro-Kann Defense: Tartakower Variation | |
| Jun 8, 2024 | Thorsteinsdottir | 1–0 | Sigfusson | Round 8: Thorsteinsdottir, Hallgerdur - Sigfusson, Ottar Orn Bergmann | Italian Game: Giuoco Pianissimo | |
| Jun 7, 2024 | Heidarsson | ½–½ | Thorsteinsdottir | Round 7: Heidarsson, Mikael Bjarki - Thorsteinsdottir, Hallgerdur | English Opening: Symmetrical Variation, Three Knights Variation | |
| May 9, 2024 | Thorsteinsdottir | 0–1 | Toktomushev | Bundesturnier | Sicilian Defense: French Variation | |
| Mar 15, 2024 | Kazarian | 1–0 | Thorsteinsdottir | Reykjavik Open 2024 | Caro-Kann Defense: Maróczy Variation | |
| Nov 20, 2023 | Kocyigit | 1–0 | Thorsteinsdottir | European Women's Team Championship | Queen's Indian Defense: Classical Variation, Traditional Variation | |
| Nov 19, 2023 | Exler | ½–½ | Thorsteinsdottir | European Women's Team Championship | Caro-Kann Defense: Classical Variation | |
| Nov 18, 2023 | Thorsteinsdottir | ½–½ | Puuska | European Women's Team Championship | Sicilian Defense: O'Kelly Variation, Venice System | |
| Nov 17, 2023 | Thorsteinsdottir | 1–0 | Petrovska | Round 6: Thorsteinsdottir, Hallgerdur - Petrovska, Katerina | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Nov 15, 2023 | Thorsteinsdottir | 1–0 | Ostensson | European Women's Team Championship | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Nov 14, 2023 | Skaslien | 1–0 | Thorsteinsdottir | European Women's Team Championship | Nimzo-Indian Defense: Sämisch Variation, Capablanca Variation | |
| Nov 12, 2023 | Cassi | 1–0 | Thorsteinsdottir | European Women's Team Championship | Caro-Kann Defense: Tartakower Variation | |
| Nov 11, 2023 | Thorsteinsdottir | ½–½ | Manko | European Women's Team Championship | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Oct 1, 2023 | Socko | 1–0 | Thorsteinsdottir | European Women's Chess Club Cup 2023 | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Oct 9, 2022 | Thorsteinsdottir | 1–0 | Schnegg | ECCC_22 | Philidor Defense: Exchange Variation | |
| Oct 8, 2022 | Gajcin | 1–0 | Thorsteinsdottir | ECCC_22 | Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line | |
| Oct 7, 2022 | Doluhanova | 1–0 | Thorsteinsdottir | ECCC_22 | Caro-Kann Defense: Breyer Variation | |
| Oct 6, 2022 | Thorsteinsdottir | 1–0 | Peglau | ECCC_22 | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Oct 3, 2022 | Thorsteinsdottir | 0–1 | Hunt | 26th European Women's Club Cup | Sicilian Defense: Moscow Variation | |
| Apr 11, 2022 | Lohia | 1–0 | Thorsteinsdottir | ROpen 2022 | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Apr 7, 2022 | Haugen | 1–0 | Thorsteinsdottir | Kvika Reykjavik Open 2022 | English Opening: Anglo-Grünfeld Defense | |
| Apr 6, 2022 | Valkama | ½–½ | Thorsteinsdottir | Kvika Reykjavik Open 2022 | Caro-Kann Defense: Advance Variation, Short Variation | |
| Feb 23, 2022 | Vestby-Ellingsen | 1–0 | Thorsteinsdottir | Krageroe Resort Chess 2022 | Queen's Indian Defense: Kasparov-Petrosian Variation, Classical Variation | |
| — | Thorsteinsdottir | 0–1 | Klinova | ETCC 2021 women | Italian Game: Giuoco Pianissimo, Normal | |
| — | Thorsteinsdottir | ½–½ | Caglar | ETCC 2021 women | Sicilian Defense: French Variation | |
| — | Thorsteinsdottir | 0–1 | Urh | ETCC 2021 women | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| — | Thorsteinsdottir | 1–0 | Barbier | ETCC 2021 women | Philidor Defense: Lion Variation | |
| — | Thorsteinsdottir | 0–1 | Willow | Reykjavik Open 2022 | Sicilian Defense: Nimzowitsch Variation, Advance Variation | |
| — | Thorsteinsdottir | 1–0 | Bjarnason | Goðinn 20th Anniversary Open | Caro-Kann Defense | |
| — | Thorsteinsdottir | 0–1 | Jonsson | Goðinn 20th Anniversary Open | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| — | Thorsteinsdottir | 1–0 | Eymundsson | Goðinn 20th Anniversary Open | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| — | Roebers | 1–0 | Thorsteinsdottir | ETCC 2021 women | Caro-Kann Defense: Two Knights Attack | |
| — | Kolaric | ½–½ | Thorsteinsdottir | ETCC 2021 women | London System | |
| — | Head | ½–½ | Thorsteinsdottir | ETCC 2021 women | Grünfeld Defense: Stockholm Variation | |
| — | Williams | 1–0 | Thorsteinsdottir | Goðinn 20th Anniversary Open | Queen's Indian Defense: Fianchetto Variation, Kramnik Variation | |
| — | Birgisson | 0–1 | Thorsteinsdottir | Goðinn 20th Anniversary Open | Neo-Grünfeld Defense: Classical Variation, Modern Defense | |