| Feb 22, 2026 | Kollias | 0–1 | Stefanou | Round 5: Kollias, Ioannis K. - Stefanou, Dimitrios | Pirc Defense | |
| Feb 21, 2026 | Tzagarakis | ½–½ | Kollias | Round 4: Tzagarakis, Panagiotis - Kollias, Ioannis K. | Ruy Lopez: Schliemann Defense | |
| Feb 21, 2026 | Kollias | ½–½ | Kyparissopoulos | Round 3: Kollias, Ioannis K. - Kyparissopoulos, Spyridon | French Defense: Classical Variation, Burn Variation | |
| Feb 20, 2026 | Leftheriotis | 0–1 | Kollias | Round 2: Leftheriotis, Alexandros - Kollias, Ioannis K. | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Jan 10, 2026 | Toliopoulos | ½–½ | Kollias | Round 9: Toliopoulos, Konstantinos - Kollias, Ioannis K. | Vienna Game: Frankenstein-Dracula Variation | |
| Jan 9, 2026 | Kollias | 0–1 | Tzortzatos | Round 8: Kollias, Ioannis K. - Tzortzatos, Dimosthenis Panagiot | Rat Defense: Harmonist | |
| Jan 8, 2026 | Kollias | 1–0 | Margaritis | Round 7: Kollias, Ioannis K. - Margaritis, Ioannis M | King's Pawn Game | |
| Jan 7, 2026 | Mantazis | 1–0 | Kollias | Round 6: Mantazis, Georgios Rafail - Kollias, Ioannis K. | Ruy Lopez: Schliemann Defense | |
| Jan 6, 2026 | Kollias | 0–1 | Kalogridis | Round 5: Kollias, Ioannis K. - Kalogridis, Antonios | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jan 5, 2026 | Cook | 0–1 | Kollias | Round 4: Cook, Michael-Antony - Kollias, Ioannis K. | Ruy Lopez: Schliemann Defense | |
| Jan 4, 2026 | Kollias | ½–½ | Galanis | Round 3: Kollias, Ioannis K. - Galanis, Nikolaos-Panagiotis | Ruy Lopez: Morphy Defense, Steinitz Deferred | |
| Jan 4, 2026 | Samakas | 0–1 | Kollias | Round 2: Samakas, Anastasios - Kollias, Ioannis K. | Ruy Lopez: Schliemann Defense | |
| Dec 31, 2025 | Kollias | 0–1 | Krallis | Round 1: Kollias, Ioannis K. - Krallis, Christos | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jul 19, 2025 | Kollias | 0–1 | Delchev | Round 1: Kollias, Ioannis K. - Delchev, Aleksander | Sicilian Defense: Kan Variation, Wing Attack | |
| Jun 8, 2025 | Kiryttopoulos | 0–1 | Kollias | 43rd Hybrid Greek Cup 2025 F16 | Scotch Game: Mieses Variation | |
| Jul 17, 2024 | Kollias | 0–1 | Fragkos | Round 9: Kollias, Ioannis K. - Fragkos, Vasileios | Ruy Lopez: Closed, Chigorin Defense | |
| Jul 16, 2024 | Kollias | 1–0 | Tzovanis | Round 8: Kollias, Ioannis K. - Tzovanis, Anastasios Anagnostis | Bird Opening | |
| Jul 15, 2024 | Boulamatsis | 1–0 | Kollias | Round 6: Boulamatsis, Konstantinos I - Kollias, Ioannis K. | Scotch Game: Tartakower Variation | |
| Jul 14, 2024 | Kollias | 1–0 | Kokkalis | Round 5: Kollias, Ioannis K. - Kokkalis, Vasilios | Bird Opening: Dutch Variation | |
| Jul 13, 2024 | Ben Ari | 1–0 | Kollias | Round 4: Ben Ari, Yannay - Kollias, Ioannis K. | English Opening: Agincourt Defense | |
| Jul 12, 2024 | Kollias | ½–½ | Gazis | Round 2: Kollias, Ioannis K. - Gazis, Efstathios | Caro-Kann Defense: Panov Attack, Modern Defense | |
| Aug 6, 2024 | Kollias | 0–1 | Charkhalashvili | Round 1: Kollias, Ioannis K. - Charkhalashvili, Inga | Bird Opening: Dutch Variation | |
| Aug 18, 2022 | Kollias | 0–1 | Kanakaris | Greek Team Cup Final 8 | Sicilian Defense: Najdorf Variation | |
