| 23 jul 2026 | Badacsonyi, Stanley 2476 | Kjartansson, Gudmundur 2367 | 1-0 | E46 Nimzo-Indian Defense: Normal Variation | Sussex University Masters Blitz-1 | 32 | Ver |
| 23 jul 2026 | Shearsby, Jude 2260 | Kjartansson, Gudmundur 2367 | 0-1 | B23 Sicilian Defense: Grand Prix Attack | Sussex University Masters Blitz-1 | 53 | Ver |
| 23 jul 2026 | Kjartansson, Gudmundur 2367 | Collins, Adam 2231 | 1-0 | C07 French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | Sussex University Masters Blitz-1 | 58 | Ver |
| 23 jul 2026 | Hariharan, Shambavi 2032 | Kjartansson, Gudmundur 2367 | ½-½ | D45 Semi-Slav Defense: Normal Variation | Sussex University Masters Blitz-1 | 61 | Ver |
| 23 jul 2026 | Kjartansson, Gudmundur 2367 | Kothari, Jai 2043 | 0-1 | C96 Ruy Lopez: Closed, Borisenko Variation | Sussex University Masters Blitz-1 | 86 | Ver |
| 23 jul 2026 | Buckley, Graeme N 2261 | Kjartansson, Gudmundur 2395 | 0-1 | B52 Sicilian Defense: Moscow Variation, Sokolsky Variation | Sussex University Masters | 36 | Ver |
| 23 jul 2026 | Kjartansson, Gudmundur 2395 | Kendall, Arthur 2045 | 1-0 | D26 Queen's Gambit Accepted: Normal Variation, Traditional System | Sussex University Masters | 61 | Ver |
| 22 jul 2026 | Badacsonyi, Stanley 2312 | Kjartansson, Gudmundur 2395 | 1-0 | E16 Queen's Indian Defense: Capablanca Variation | Sussex University Masters | 54 | Ver |
| 22 jul 2026 | Kjartansson, Gudmundur 2395 | Merriman, James 2161 | 1-0 | A13 English Opening: Agincourt Defense, Bogoljubow Defense | Sussex University Masters | 49 | Ver |
| 21 jul 2026 | Sooraj M R 2198 | Kjartansson, Gudmundur 2395 | ½-½ | B24 Sicilian Defense: Closed | Sussex University Masters | 57 | Ver |
| 3 jul 2026 | Tomasi, Albert 2328 | Kjartansson, Gudmundur 2395 | 0-1 | B91 Sicilian Defense: Najdorf Variation, Zagreb Variation | 11 ème Open international de Porticcio | 34 | Ver |
| 2 jul 2026 | Kjartansson, Gudmundur 2395 | Deladerriere, Apollo 2049 | 1-0 | A11 Réti Opening: Anglo-Slav Variation, Gurevich System | 11 ème Open international de Porticcio | 53 | Ver |
| 1 jul 2026 | Koelle, Tobias 2498 | Kjartansson, Gudmundur 2395 | 1-0 | D41 Queen's Gambit Declined: Semi-Tarrasch Defense | 11 ème Open international de Porticcio | 37 | Ver |
| 30 jun 2026 | Kjartansson, Gudmundur 2395 | Maltezeanu, Stefan 2199 | 1-0 | D12 Slav Defense: Quiet Variation, Schallopp Defense | 11 ème Open international de Porticcio | 30 | Ver |
| 30 jun 2026 | Sumets, Andrey 2513 | Kjartansson, Gudmundur 2395 | ½-½ | E05 Catalan Opening: Open Defense, Classical Line | 11 ème Open international de Porticcio | 41 | Ver |
| 29 jun 2026 | Kjartansson, Gudmundur 2395 | Shahmammadli, Safkhan 2109 | 1-0 | E66 King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line | 11 ème Open international de Porticcio | 36 | Ver |
| 28 jun 2026 | Pakleza, Zbigniew 2499 | Kjartansson, Gudmundur 2395 | 1-0 | A11 Réti Opening: Anglo-Slav Variation, Gurevich System | 11 ème Open international de Porticcio | 75 | Ver |
| 27 jun 2026 | Minde, Timothe 2045 | Kjartansson, Gudmundur 2395 | 0-1 | C44 Scotch Game: Scotch Gambit, Advance Variation | 11 ème Open international de Porticcio | 31 | Ver |
| 12 jun 2026 | Kjartansson, Gudmundur 2367 | Ammar, Sedrani 2182 | 0-1 | D11 Slav Defense: Quiet Variation, Pin Defense | Sussex University Masters Blitz-1 | 29 | Ver |
| 9 may 2026 | Kjartansson, Gudmundur 2399 | Stefansson, Vignir Vatnar 2534 | 0-1 | A38 English Opening: Symmetrical Variation, Full Symmetry Line | Landsliðsflokkur Íslandsmótsins í skák 2026 | 58 | Ver |