| Mar 19, 2026 | Kazakouski | ½–½ | Johannsson | Kópavogur International Chess Tournament 2026 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Mar 18, 2026 | Johannsson | ½–½ | Ragnarsson | Kópavogur International Chess Tournament 2026 | Queen's Gambit Declined: Harrwitz Attack | |
| Mar 15, 2026 | Heimisson | 0–1 | Johannsson | Kópavogur International Chess Tournament 2026 | Sicilian Defense: Moscow Variation, Main Line | |
| Mar 13, 2026 | Johannsson | 1–0 | Birkisson | Kópavogur International Chess Tournament 2026 | Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense | |
| Mar 13, 2026 | Domalchuk-Jonasson | 0–1 | Johannsson | Kópavogur International Chess Tournament 2026 | Queen's Pawn Game: Symmetrical Variation | |
| Mar 12, 2026 | Johannsson | 0–1 | Pultinevicius | Kópavogur International Chess Tournament 2026 | Semi-Slav Defense: Meran Variation | |
| Mar 11, 2026 | Stefansson | 1–0 | Johannsson | Kópavogur International Chess Tournament 2026 | Four Knights Game: Glek System | |
| Mar 10, 2026 | Johannsson | 0–1 | Santos Latasa | Kópavogur International Chess Tournament 2026 | Semi-Slav Defense: Meran Variation | |
| Mar 10, 2026 | Johannsson | ½–½ | Oleksiyenko | Kópavogur International Chess Tournament 2026 | East Indian Defense | |
| Mar 8, 2026 | Thorfinnsson | 1–0 | Johannsson | Icelandic team chess championship premier league | Queen's Pawn Game: Levitsky Attack | |
| Mar 7, 2026 | Johannsson | 0–1 | Danielsen | Icelandic team chess championship premier league | Indian Defense: Wade-Tartakower Defense | |
| Mar 7, 2026 | Johannsson | ½–½ | Gretarsson | Icelandic team chess championship premier league | Wade Defense | |
| Mar 6, 2026 | Thorhallsson | 0–1 | Johannsson | Icelandic team chess championship premier league | Caro-Kann Defense: Tartakower Variation | |
| Mar 5, 2026 | Johannsson | ½–½ | Ragnarsson | Icelandic team chess championship premier league | Tarrasch Defense: Symmetrical Variation | |
| Dec 7, 2025 | Johannsson | 0–1 | Thorfinnsson | Friðriksmót Landsbankans – Íslandsmótið í hraðskák | Queen's Gambit Declined: Three Knights Variation | |
| Dec 7, 2025 | Johannsson | 0–1 | Heimisson | Friðriksmót Landsbankans – Íslandsmótið í hraðskák | Slav Defense: Modern Line | |
| Nov 16, 2025 | Johannsson | 1–0 | Johannsson | Icelandic team chess championship premier league | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Nov 15, 2025 | Arngrimsson | ½–½ | Johannsson | Icelandic team chess championship premier league | Queen's Gambit Declined | |
| Nov 14, 2025 | Johannsson | 1–0 | Kjartansson | Icelandic team chess championship premier league | Bogo-Indian Defense: Wade-Smyslov Variation | |
| Oct 25, 2025 | Rappazzo | 1–0 | Johannsson | Round 7: Rappazzo, Johannes - Johannsson, Birkir Isak | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Oct 21, 2025 | Willems | ½–½ | Johannsson | Round 3: Willems, Niels - Johannsson, Birkir Isak | English Opening: Agincourt Defense | |
| Oct 20, 2025 | Johannsson | 0–1 | Pribelszky | Round 2: Johannsson, Birkir Isak - Pribelszky, Bence | Pseudo Queen's Indian Defense | |
| Oct 25, 2024 | Johannsson | ½–½ | Duncan | 39th European Chess Club Cup | Queen's Gambit Declined | |
| Oct 24, 2024 | Haag | 1–0 | Johannsson | 39th European Chess Club Cup | Queen's Gambit Declined: Vienna Variation, Quiet Variation | |
| Oct 23, 2024 | Hoerstmann | 0–1 | Johannsson | 39th European Chess Club Cup | English Opening: Agincourt Defense | |
| Oct 21, 2024 | Johannsson | 1–0 | Van der Hagen | 39th European Chess Club Cup | Queen's Gambit Declined: Ragozin Defense, Vienna Variation | |
| Oct 20, 2024 | Cooney | 0–1 | Johannsson | 39th European Chess Club Cup | Caro-Kann Defense: Tartakower Variation | |
| Mar 16, 2024 | Johannsson | 0–1 | Salimova | Reykjavik Open 2024 | Catalan Opening: Closed | |
| Oct 22, 2024 | Johannsson | 0–1 | Veinberg | Round 3: Johannsson, Birkir Isak - Veinberg, Nimrod | Bogo-Indian Defense: Retreat Variation | |
| Mar 31, 2023 | Johannsson | 0–1 | Panchanathan | Reykjavik Open | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Mar 19, 2023 | Johannsson | 0–1 | Finnsson | Icelandic Team Championship | Queen's Gambit Declined | |
| Mar 18, 2023 | Thorfinnsson | 1–0 | Johannsson | Icelandic Team Championship | Queen's Pawn Game: Levitsky Attack | |
| Mar 18, 2023 | Stefansson | 1–0 | Johannsson | Icelandic Team Championship | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Mar 17, 2023 | Einarsson | ½–½ | Johannsson | Icelandic Team Championship | Queen's Gambit Declined: Cambridge Springs Defense, Capablanca Variation | |
| Jul 9, 2022 | Johannsson Birkir Isak | * | Librelato Kathie Goulart | QCC | ? | |
| Jul 8, 2022 | Palchuk Andrii | * | Johannsson Birkir Isak | QCC | Queen's Pawn Game: Symmetrical Variation | |
| Jul 7, 2022 | Johannsson Birkir Isak | * | Simek Petr | QCC | ? | |
| Jul 6, 2022 | Neuman Petr | * | Johannsson Birkir Isak | QCC | ? | |
| Jul 5, 2022 | Johannsson Birkir Isak | * | Matras Ondrej | QCC | ? | |
| Jul 4, 2022 | Koc Azra Ece | * | Johannsson Birkir Isak | QCC | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jul 3, 2022 | Johannsson Birkir Isak | 1–0 | Milovs Daniels | QCC | French Defense: Rubinstein Variation, Blackburne Defense | |
| Jul 2, 2022 | Pavlicek Petr | * | Johannsson Birkir Isak | QCC | ? | |
| Jul 1, 2022 | Johannsson Birkir Isak | 0–1 | Wojdyla Alex | QCC | Indian Defense: Anti-Nimzo-Indian | |
