| 9 ago 2026 | Tureshbayev, Anuar 2250 | Barnes, Oliver 2107 | ½-½ | C17 Defensa Francesa: Winawer Variation, Bogoljubow Variation | The 105th Irish Championship 2026 | Championship | 41 | Ver |
| 8 ago 2026 | Barnes, Oliver 2107 | Melaugh, Shane 2157 | 1-0 | A40 Horwitz Defense | The 105th Irish Championship 2026 | Championship | 31 | Ver |
| 7 ago 2026 | Daly, Colm 2182 | Barnes, Oliver 2107 | 0-1 | B43 Defensa Siciliana: Kan Variation, Knight Variation | The 105th Irish Championship 2026 | Championship | 55 | Ver |
| 6 ago 2026 | Barnes, Oliver 2107 | Hughes, Padraig 2022 | 1-0 | A15 Apertura Inglesa: Anglo-Indian Defense, King's Indian Formation | The 105th Irish Championship 2026 | Championship | 40 | Ver |
| 5 ago 2026 | Jessel, Stephen 2364 | Barnes, Oliver 2107 | 1-0 | A14 Apertura Inglesa: Agincourt Defense, Neo-Catalan Declined | The 105th Irish Championship 2026 | Championship | 42 | Ver |
| 4 ago 2026 | Barnes, Oliver 2107 | Liu, Jason 2161 | ½-½ | A15 Apertura Inglesa: Anglo-Indian Defense, King's Indian Formation, Double Fianchetto | The 105th Irish Championship 2026 | Championship | 29 | Ver |
| 1 ago 2026 | Venkatesan, Kavin 2297 | Barnes, Oliver 2107 | ½-½ | A19 Apertura Inglesa: Anglo-Indian Defense, Flohr-Mikenas-Carls Variation, Nei Gambit | The 105th Irish Championship 2026 | Championship | 66 | Ver |
| 26 jun 2026 | Barnes, Oliver 2000 | Dupuis, Denis K 2217 | ½-½ | C47 Apertura de los Cuatro Caballos: Scotch Variation Accepted | FIDE World Youth Chess Championships 2026 | O18 | 29 | Ver |
| 25 jun 2026 | Camps Abadia, Arnau 2159 | Barnes, Oliver 2000 | 0-1 | D38 Gambito de Dama rehusado: Ragozin Defense, Alekhine Variation | FIDE World Youth Chess Championships 2026 | O18 | 37 | Ver |
| 24 jun 2026 | Barnes, Oliver 2000 | Schneider, Aron 2204 | ½-½ | A06 Apertura Zukertort | FIDE World Youth Chess Championships 2026 | O18 | 42 | Ver |
| 20 jun 2026 | Barnes, Oliver 2000 | Pressler, Tobias 2182 | 0-1 | D32 Gambito de Dama rehusado: Tarrasch Defense | FIDE World Youth Chess Championships 2026 | O18 | 58 | Ver |
| 19 jun 2026 | Chekanov, Timur 2190 | Barnes, Oliver 2000 | ½-½ | C07 Defensa Francesa: Tarrasch Variation, Chistyakov Defense | FIDE World Youth Chess Championships 2026 | O18 | 50 | Ver |
| 18 jun 2026 | Efimov, Leonid 2331 | Barnes, Oliver 2000 | 1-0 | E28 Defensa Nimzoindia: Sämisch Variation | FIDE World Youth Chess Championships 2026 | O18 | 30 | Ver |
| 17 jun 2026 | Barnes, Oliver 2000 | Liu, Jason 2252 | ½-½ | A17 Apertura Inglesa: Anglo-Indian Defense, Nimzo-English | FIDE World Youth Chess Championships 2026 | O18 | 33 | Ver |
| 15 jun 2026 | Barnes, Oliver 2000 | Hovakimyan, Vache 2325 | 0-1 | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo, with h6 | FIDE World Youth Chess Championships 2026 | O18 | 64 | Ver |
| 30 may 2026 | Barnes, Oliver 2000 | Balaji, Aaravamudhan 2315 | 0-1 | B06 Defensa Moderna | 35th Drogheda Chess Congress | Thomson Masters | 69 | Ver |
| 28 may 2026 | Barnes, Oliver 2000 | Kanyamarala, Tarun 2426 | 0-1 | B56 Defensa Siciliana: Kupreichik Variation | 35th Drogheda Chess Congress | Thomson Masters | 45 | Ver |
| 8 feb 2026 | Rosol, Philip 2271 | Barnes, Oliver 2013 | 1-0 | E49 Defensa Nimzoindia: Normal Variation, Botvinnik System | Sligo 2026 Open | 51 | Ver |
| 7 feb 2026 | Barnes, Oliver 2013 | Hushpit, Lukian 2100 | ½-½ | D05 Apertura de Peón de Dama: Colle System | Sligo 2026 Open | 22 | Ver |
| 7 feb 2026 | Rakhmangulov, Andrei 2259 | Barnes, Oliver 2032 | 1-0 | D38 Gambito de Dama rehusado: Ragozin Defense, Alekhine Variation | Sligo 2026 Blitz | 41 | Ver |