| 9 jun 2026 | Diak, Hryhorii 2058 | Andriienko, Artom 2155 | ½-½ | E11 Defensa Bogoindia: Nimzowitsch Variation | 25th IPCA World Individual Chess Championship 2026 | Rapid | Open | 21 | Ver |
| 9 jun 2026 | Diak, Hryhorii 2058 | Campos, Eugenio 2178 | 1-0 | E10 Defensa India: Anti-Nimzo-Indian | 25th IPCA World Individual Chess Championship 2026 | Rapid | Open | 31 | Ver |
| 8 jun 2026 | Valenta, Vit Vaclav 2070 | Diak, Hryhorii 2058 | 0-1 | A00 Apertura Polaca: Czech Defense | 25th IPCA World Individual Chess Championship 2026 | Rapid | Open | 40 | Ver |
| 8 jun 2026 | Diak, Hryhorii 2058 | Soltanov, Serik 2161 | 1-0 | D05 Apertura de Peón de Dama: Colle System, Traditional Colle | 25th IPCA World Individual Chess Championship 2026 | Rapid | Open | 30 | Ver |
| 8 jun 2026 | Molenda, Marcin 2251 | Diak, Hryhorii 2058 | 1-0 | B27 Defensa Siciliana: Hyperaccelerated Dragon | 25th IPCA World Individual Chess Championship 2026 | Rapid | Open | 81 | Ver |
| 8 jun 2026 | Diak, Hryhorii 2058 | Czerwonski, Aleksander 2237 | 1-0 | A41 Defensa Rata: English Rat | 25th IPCA World Individual Chess Championship 2026 | Rapid | Open | 68 | Ver |
| 1 jun 2026 | Diak, Hryhorii 2058 | Dzenisenia, Mikhail. 2175 | ½-½ | D25 Gambito de Dama aceptado: Janowski-Larsen Variation | 25th IPCA World Individual Chess Championship 2026 | Rapid | Open | 35 | Ver |
| 13 oct 2025 | Valenta, Vit Vaclav 2037 | Diak, Hryhorii 2013 | ½-½ | B23 Defensa Siciliana: Closed, Chameleon Variation | 5th IPCA European Individual Chess Championship 2025 | Rapid | 33 | Ver |
| 13 oct 2025 | Diak, Hryhorii 2013 | Mukha, Mykola 2063 | 1-0 | E13 Defensa India de Dama: Kasparov Variation | 5th IPCA European Individual Chess Championship 2025 | Rapid | 51 | Ver |
| 13 oct 2025 | Diak, Hryhorii 2013 | Neschotnyi, Viktor 2055 | ½-½ | D15 Defensa Eslava: Chebanenko Variation | 5th IPCA European Individual Chess Championship 2025 | Rapid | 30 | Ver |
| 13 oct 2025 | Gurbanov, Andrei 2169 | Diak, Hryhorii 2013 | 0-1 | E16 Defensa India de Dama: Capablanca Variation | 5th IPCA European Individual Chess Championship 2025 | Rapid | 39 | Ver |
| 12 oct 2025 | Diak, Hryhorii 2013 | Andriienko, Artom 2175 | ½-½ | E11 Defensa Bogoindia: Retreat Variation | 5th IPCA European Individual Chess Championship 2025 | Rapid | 9 | Ver |
| 12 oct 2025 | Diak, Hryhorii 2013 | Babula, Milan 2218 | 1-0 | E70 Defensa India de Rey: Normal Variation | 5th IPCA European Individual Chess Championship 2025 | Rapid | 59 | Ver |