| 14 ago 2026 | Ivanov, Igor 2233 | Johannesson, Oliver 2262 | 1-0 | A40 Horwitz Defense | Split Chess Open 2026 | 37 | Ver |
| 13 ago 2026 | Johannesson, Oliver 2262 | Palac, Mladen 2464 | ½-½ | A35 Apertura Inglesa: Symmetrical Variation, Four Knights Variation | Split Chess Open 2026 | 16 | Ver |
| 12 ago 2026 | Johannesson, Oliver 2262 | Kelbl, Jakob 2090 | 1-0 | B10 Defensa Caro-Kann: Endgame Offer | Split Chess Open 2026 | 37 | Ver |
| 11 ago 2026 | Botica, Viseslav 2079 | Johannesson, Oliver 2262 | 0-1 | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | Split Chess Open 2026 | 46 | Ver |
| 9 ago 2026 | Johannesson, Oliver 2262 | Sagovac, Kristijan 2106 | ½-½ | B31 Defensa Siciliana: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | Split Chess Open 2026 | 50 | Ver |
| 9 ago 2026 | Baasansuren, Erdene 2406 | Johannesson, Oliver 2262 | 1-0 | A14 Apertura Inglesa: Agincourt Defense, Neo-Catalan Declined | Split Chess Open 2026 | 51 | Ver |
| 8 ago 2026 | Johannesson, Oliver 2262 | Heimisson, Hilmir Freyr 2338 | ½-½ | A07 Ataque Indio de Rey | Split Chess Open 2026 | 9 | Ver |
| 8 mar 2026 | Johannesson, Ingvar Thor 2260 | Johannesson, Oliver 2256 | ½-½ | E06 Apertura Catalana: Closed | Icelandic team chess championship premier league | 15 | Ver |
| 7 mar 2026 | Kjartansson, David 2249 | Johannesson, Oliver 2256 | ½-½ | D00 Apertura de Peón de Dama: Accelerated London System | Icelandic team chess championship premier league | 19 | Ver |
| 7 mar 2026 | Johannesson, Oliver 2256 | Prudnikov, Andrey 2121 | 1-0 | B29 Defensa Siciliana: Nimzowitsch Variation, Closed Variation | Icelandic team chess championship premier league | 73 | Ver |
| 6 mar 2026 | Gislason, Gudmundur 2256 | Johannesson, Oliver 2256 | ½-½ | A29 Apertura Inglesa: King's English Variation, Four Knights Variation, Fianchetto Line | Icelandic team chess championship premier league | 50 | Ver |
| 7 dic 2025 | Johannesson, Oliver 2266 | Stefansson, Vignir Vatnar 2599 | 0-1 | C02 Defensa Francesa: Advance Variation, Euwe Variation | Friðriksmót Landsbankans – Íslandsmótið í hraðskák | 30 | Ver |
| 7 dic 2025 | Thorfinnsson, Bjorn 2416 | Johannesson, Oliver 2266 | 1-0 | D02 Apertura de Peón de Dama: Symmetrical Variation | Friðriksmót Landsbankans – Íslandsmótið í hraðskák | 26 | Ver |
| 4 dic 2025 | Johannsson, Birkir Isak 2221 | Johannesson, Oliver 2256 | 1-0 | A43 Defensa India: Pseudo-Benko | Icelandic team chess championship premier league | 37 | Ver |
| 16 nov 2025 | Johannesson, Oliver 2261 | Jonasson, Benedikt 2164 | 1-0 | E65 Defensa India de Rey: Fianchetto Variation, Yugoslav Variation, Exchange Line | Icelandic team chess championship premier league | 35 | Ver |
| 15 nov 2025 | Prudnikov, Andrey 2133 | Johannesson, Oliver 2261 | ½-½ | B47 Defensa Siciliana: Taimanov Variation, Bastrikov Variation | Icelandic team chess championship premier league | 41 | Ver |
| 14 nov 2025 | Johannesson, Oliver 2261 | Gislason, Gudmundur 2219 | ½-½ | B21 Defensa Siciliana: Smith-Morra Gambit | Icelandic team chess championship premier league | 36 | Ver |
| 21 oct 2025 | Johannesson, Oliver 2264 | Korsunsky, Yuri 2369 | ½-½ | B06 Defensa Moderna: Standard Defense | European Chess Club Cup 2025 | Open Matches 1-16 | 46 | Ver |
| 20 oct 2025 | Jablonicky, Martin 2330 | Johannesson, Oliver 2264 | ½-½ | A20 Apertura Inglesa: King's English Variation | European Chess Club Cup 2025 | Open Matches 17+ | 43 | Ver |
| 12 sep 2025 | Johannesson, Oliver 2245 | Ptacnikova, Lenka 2154 | 1-0 | D41 Gambito de Dama rehusado: Semi-Tarrasch Defense, Pillsbury Variation | Haustmot TR 2025 | 34 | Ver |