| 26 jun 2026 | Le Geay, Joachim 2365 | Hallmundarson, Birkir 2007 | 1-0 | B31 Defensa Siciliana: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | FIDE World Youth Chess Championships 2026 | O14 | 23 | Ver |
| 25 jun 2026 | Hallmundarson, Birkir 2007 | Wijerathna, Vinuka Dihain 2165 | 0-1 | C45 Apertura Escocesa: Mieses Variation | FIDE World Youth Chess Championships 2026 | O14 | 44 | Ver |
| 24 jun 2026 | Velim, Vojtech 2247 | Hallmundarson, Birkir 2007 | 0-1 | B34 Defensa Siciliana: Accelerated Dragon, Modern Variation | FIDE World Youth Chess Championships 2026 | O14 | 60 | Ver |
| 20 jun 2026 | Hallmundarson, Birkir 2007 | Rusu, Lucas 2191 | 0-1 | B48 Defensa Siciliana: Taimanov Variation, Bastrikov Variation, English Attack | FIDE World Youth Chess Championships 2026 | O14 | 35 | Ver |
| 18 jun 2026 | Hallmundarson, Birkir 2007 | Arun, Nitish 2177 | 0-1 | D38 Gambito de Dama rehusado: Westphalian Variation | FIDE World Youth Chess Championships 2026 | O14 | 94 | Ver |
| 16 jun 2026 | Hallmundarson, Birkir 2007 | Vorobyov, Radmir 2169 | 0-1 | B12 Defensa Caro-Kann: Advance Variation, Botvinnik-Carls Defense | FIDE World Youth Chess Championships 2026 | O14 | 53 | Ver |
| 4 jun 2026 | Oskarsson, Markus Orri 2159 | Hallmundarson, Birkir 2007 | 1-0 | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | Skákþing Íslands - Áskorendaflokkur 2026 | 37 | Ver |
| 1 jun 2026 | Hallmundarson, Birkir 2007 | Karlsson, Mikael Johann 2157 | 1-0 | B43 Defensa Siciliana: Kan Variation, Wing Attack | Skákþing Íslands - Áskorendaflokkur 2026 | 26 | Ver |
| 30 may 2026 | Hallmundarson, Birkir 2007 | Jonsson, Gauti Pall 2131 | ½-½ | A30 Apertura Inglesa: Symmetrical Variation | Skákþing Íslands - Áskorendaflokkur 2026 | 34 | Ver |
| 30 may 2026 | Birkisson, Bjorn Holm 2223 | Hallmundarson, Birkir 2007 | ½-½ | A15 Apertura Inglesa: Anglo-Indian Defense, King's Knight Variation | Skákþing Íslands - Áskorendaflokkur 2026 | 62 | Ver |