| 4 may 2026 | Jarocka, Liwia 2288 | O`Donnell, Conor 2294 | ½-½ | B12 Caro-Kann Defense: Advance Variation | 4NCL Division 1 2025-2026 | 34 | Ver |
| 3 may 2026 | Eggleston, David J 2347 | O`Donnell, Conor 2294 | ½-½ | B12 Caro-Kann Defense: Advance Variation, Tal Variation | 4NCL Division 1 2025-2026 | 97 | Ver |
| 2 may 2026 | O`Donnell, Conor 2294 | Dicen, Elis Denele 2139 | 0-1 | E91 King's Indian Defense: Orthodox Variation | 4NCL Division 1 2025-2026 | 43 | Ver |
| 8 mar 2026 | Petrov, Nikita 2555 | O`Donnell, Conor 2317 | 1-0 | A13 English Opening: Agincourt Defense | Icelandic team chess championship premier league | 29 | Ver |
| 7 mar 2026 | Laurusas, Tomas 2508 | O`Donnell, Conor 2317 | 1-0 | E48 Nimzo-Indian Defense: Normal Variation, Classical Defense | Icelandic team chess championship premier league | 36 | Ver |
| 7 mar 2026 | O`Donnell, Conor 2317 | Williams, Simon K 2443 | 0-1 | A90 Dutch Defense: Classical Variation | Icelandic team chess championship premier league | 31 | Ver |
| 6 mar 2026 | Birkisson, Bardur Orn 2207 | O`Donnell, Conor 2317 | 1-0 | D41 Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation | Icelandic team chess championship premier league | 48 | Ver |
| 5 mar 2026 | O`Donnell, Conor 2317 | Sulypa, Oleksandr 2455 | ½-½ | E04 Catalan Opening: Open Defense | Icelandic team chess championship premier league | 31 | Ver |
| 8 feb 2026 | O`Donnell, Conor 2306 | Nelson, Jonathan P 2117 | 1-0 | E73 King's Indian Defense: Semi-Averbakh System | 4NCL Division 1 2025-2026 | 41 | Ver |
| 7 feb 2026 | Mesropyan, Hayk 2146 | O`Donnell, Conor 2306 | 0-1 | B30 Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | 4NCL Division 1 2025-2026 | 33 | Ver |
| 11 ene 2026 | Nawalaniec, Adam 2278 | O`Donnell, Conor 2303 | ½-½ | B13 Caro-Kann Defense: Exchange Variation | 4NCL Division 1 2025-2026 | 52 | Ver |
| 10 ene 2026 | O`Donnell, Conor 2303 | Maciol, Ryszard 2066 | 1-0 | C02 French Defense: Advance Variation, Lputian Variation | 4NCL Division 1 2025-2026 | 31 | Ver |
| 4 dic 2025 | Gunnarsson, Jon Viktor 2442 | O`Donnell, Conor 2303 | 0-1 | B11 Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line | Icelandic team chess championship premier league | 40 | Ver |
| 16 nov 2025 | O`Donnell, Conor 2292 | Hardaway, Brewington 2522 | 0-1 | D37 Queen's Gambit Declined: Vienna Variation, Quiet Variation | Icelandic team chess championship premier league | 49 | Ver |
| 15 nov 2025 | Bogdanov, Egor 2510 | O`Donnell, Conor 2292 | ½-½ | B19 Caro-Kann Defense: Classical Variation | Icelandic team chess championship premier league | 33 | Ver |
| 15 nov 2025 | O`Donnell, Conor 2292 | Hjartarson, Johann 2473 | 0-1 | E38 Nimzo-Indian Defense: Classical Variation, Berlin Variation | Icelandic team chess championship premier league | 69 | Ver |
| 14 nov 2025 | O`Donnell, Conor 2292 | Jacobsen, Mikkel Manosri 2306 | ½-½ | D31 Queen's Gambit Declined: Janowski Variation | Icelandic team chess championship premier league | 41 | Ver |