| Apr 25, 2026 | Ioannidis | ½–½ | Papakonstantinou | Semifinals: Ioannidis, Evgenios - Papakonstantinou, Dimitrios | King's Indian Defense: Fianchetto Variation, Classical Variation | |
| Apr 25, 2026 | Papakonstantinou | ½–½ | Kourkoulos-Arditis | Finals: Papakonstantinou, Dimitrios - Kourkoulos-Arditis, Stamatis | Sicilian Defense: Moscow Variation | |
| Apr 18, 2026 | Papakonstantinou | 0–1 | Lopez Martinez | EICC 2026 | Sicilian Defense: Taimanov Variation | |
| Apr 16, 2026 | Ringuet | 0–1 | Papakonstantinou | EIIC 2026 | Indian Defense: Accelerated London System | |
| Apr 15, 2026 | Papakonstantinou | 0–1 | Ahmad | EICC 2026 | Slav Defense: Czech Variation, Krause Attack | |
| Apr 14, 2026 | Stocek | 1–0 | Papakonstantinou | EICC 2026 | King's Indian Defense: Makogonov Variation | |
| Apr 13, 2026 | Papakonstantinou | 1–0 | Tudor | EICC 2026 | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Apr 12, 2026 | Balinski | 0–1 | Papakonstantinou | EIIC 2026 | East Indian Defense | |
| Apr 10, 2026 | Papakonstantinou | 0–1 | Travadon | EICC 2026 | English Opening: King's English Variation | |
| Apr 9, 2026 | Madrawski | 0–1 | Papakonstantinou | EIIC 2026 | King's Indian Defense: Makogonov Variation | |
| Apr 8, 2026 | Papakonstantinou | 0–1 | Macias Pino | EICC 2026 | Sicilian Defense: Najdorf Variation | |
| Apr 7, 2026 | Demiroz | 1–0 | Papakonstantinou | EICC 2026 | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Feb 23, 2026 | Papakonstantinou | 1–0 | Giannoulakis | Round 7: Papakonstantinou, Dimitrios - Giannoulakis, Lampros | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Feb 22, 2026 | Liloni | ½–½ | Papakonstantinou | Round 6: Liloni, Francesco Mattia - Papakonstantinou, Dimitrios | Sicilian Defense: Najdorf Variation | |
| Feb 22, 2026 | Papakonstantinou | 1–0 | Skaperdas | Round 5: Papakonstantinou, Dimitrios - Skaperdas, Kostantinos | French Defense: Classical Variation, Shirov-Anand Variation | |
| Feb 21, 2026 | Kouvidis | 0–1 | Papakonstantinou | Round 4: Kouvidis, Ioannis - Papakonstantinou, Dimitrios | Vienna Game: Falkbeer Variation | |
| Sep 13, 2025 | Papakonstantinou | 0–1 | Stankovic | Round 9: Papakonstantinou, Dimitrios - Stankovic, Milos | Pirc Defense: Kholmov System | |
| Sep 13, 2025 | Arnaudov | 1–0 | Papakonstantinou | Round 7: Arnaudov, G. Petar - Papakonstantinou, Dimitrios | King's Indian Defense: Normal Variation, Rare Defenses | |
| Sep 13, 2025 | Papasimakopoulos | 0–1 | Papakonstantinou | Round 5: Papasimakopoulos, Alexandros - Papakonstantinou, Dimitrios | Zukertort Opening: Nimzo-Larsen Variation | |
| Sep 13, 2025 | Papakonstantinou | 1–0 | Marinidis | Round 4: Papakonstantinou, Dimitrios - Marinidis, Stavros | Queen's Pawn Game: Accelerated London System | |
| Sep 12, 2025 | Papakonstantinou | 0–1 | Kourkoulos-Arditis | Round 6: Papakonstantinou, Dimitrios - Kourkoulos-Arditis, Stamatis | Rapport-Jobava System | |
| Jul 19, 2025 | Kalyva | ½–½ | Papakonstantinou | Round 9: Kalyva, Kyriaki - Papakonstantinou, Dimitrios | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jul 18, 2025 | Papakonstantinou | 0–1 | Gimenez Menchon | Round 8: Papakonstantinou, Dimitrios - Gimenez Menchon, Cesar | King's Indian Defense: Orthodox Variation, Positional Defense | |
| Jul 17, 2025 | Gazis | 0–1 | Papakonstantinou | Round 7: Gazis, Efstathios - Papakonstantinou, Dimitrios | Caro-Kann Defense: Classical Variation, Lobron System | |
| Jul 16, 2025 | Papakonstantinou | 1–0 | Kotsiopoulos | Round 6: Papakonstantinou, Dimitrios - Kotsiopoulos, Panagiotis | Neo-Grünfeld Defense: Classical Variation, Original Defense | |
| Jul 13, 2025 | Velicka | 1–0 | Papakonstantinou | Round 2: Velicka, Petr - Papakonstantinou, Dimitrios | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Jul 4, 2025 | Papakonstantinou | 0–1 | Kotrotsos | Round 7: Papakonstantinou, Dimitrios - Kotrotsos, Vasilios | Vienna Game: Frankenstein-Dracula Variation | |
| Jul 3, 2025 | Papakonstantinou | ½–½ | Pavlidis | Round 2: Papakonstantinou, Dimitrios - Pavlidis, Antonios | Caro-Kann Defense: Two Knights Attack | |
| Jul 3, 2025 | Papakonstantinou | ½–½ | Giannoulakis | Round 5: Papakonstantinou, Dimitrios - Giannoulakis, Lampros | Ruy Lopez: Closed, Flohr System | |
| Mar 16, 2025 | Papakonstantinou | 1–0 | Koudounis | Round 2: Papakonstantinou, Dimitrios - Koudounis, Vasileios | ? | |
| Mar 16, 2025 | Papakonstantinou | 1–0 | Spirliadis | Round 4: Papakonstantinou, Dimitrios - Spirliadis, Achileas | ? | |
| Mar 16, 2025 | Papakonstantinou | 0–1 | Ladopoulos | Round 6: Papakonstantinou, Dimitrios - Ladopoulos, Dimitrios | ? | |
| Mar 16, 2025 | Kirgeridis | 0–1 | Papakonstantinou | Round 1: Kirgeridis, Panagiotis - Papakonstantinou, Dimitrios | ? | |
| Mar 16, 2025 | Giannoulakis | ½–½ | Papakonstantinou | Round 3: Giannoulakis, Lampros - Papakonstantinou, Dimitrios | ? | |
| Mar 16, 2025 | Kouskoutis | 0–1 | Papakonstantinou | Round 5: Kouskoutis, Georgios-Alexandros - Papakonstantinou, Dimitrios | ? | |
| Mar 16, 2025 | Mantazis | 0–1 | Papakonstantinou | Round 7: Mantazis, Georgios Rafail - Papakonstantinou, Dimitrios | ? | |
| Jul 7, 2024 | Papakonstantinou | 1–0 | Mastrovasilis | Greek League 2024 | Ruy Lopez: Morphy Defense, Steinitz Deferred | |
| Jul 5, 2024 | Makridis | 1–0 | Papakonstantinou | Greek League 2024 | Scotch Game: Mieses Variation | |
| Aug 15, 2022 | Papakonstantinou | * | Nikolov | National Greek Team Championship | ? | |
| Aug 15, 2022 | Themelis | * | Papakonstantinou | National Greek Team Championship | ? | |
| Aug 10, 2022 | Papakonstantinou | 1–0 | Ladopoulos | Thessaloniki Open | A | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Aug 9, 2022 | Papakonstantinou | 1–0 | Mitsiou | Thessaloniki Open | A | Caro-Kann Defense: Two Knights Attack | |
| Aug 8, 2022 | Papadopoulos | ½–½ | Papakonstantinou | Thessaloniki Open | A | Bogo-Indian Defense: Exchange Variation | |
| Aug 7, 2022 | Papakonstantinou | 1–0 | Androni | Thessaloniki Open | A | Sicilian Defense: Dragon Variation, Yugoslav Attack, Czerniak Variation | |
| Aug 6, 2022 | Agnello | ½–½ | Papakonstantinou | Thessaloniki Open | A | Italian Game: Scotch Gambit, Max Lange Attack | |
| Aug 5, 2022 | Papakonstantinou | 0–1 | Palma | Thessaloniki Open | A | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Aug 4, 2022 | Papakonstantinou | 1–0 | Stefan | Thessaloniki Open | A | Sicilian Defense: Moscow Variation | |
| Aug 4, 2022 | Triantafilidis | ½–½ | Papakonstantinou | Thessaloniki Open | A | Ruy Lopez: Exchange Variation, Keres Variation | |
| Aug 3, 2022 | Papadimitriou | 0–1 | Papakonstantinou | Thessaloniki Open | A | Slav Defense | |
| Jul 16, 2021 | Papakonstantinou | * | Gusev | Paracin Open | A | ? | |
| Jul 15, 2021 | Bommini Mounika Akshaya | * | Papakonstantinou | Paracin Open | A | ? | |
| Jul 14, 2021 | Papakonstantinou | * | Skonnord | Paracin Open | A | ? | |
| Jul 13, 2021 | Papakonstantinou | * | Balabayeva | Paracin Open | A | ? | |
| Jul 12, 2021 | Samaridis | * | Papakonstantinou | Paracin Open | A | ? | |
| Jul 10, 2021 | Papakonstantinou | * | Farkas | Paracin Open | A | ? | |
| Jul 10, 2021 | Aslanov | * | Papakonstantinou | Paracin Open | A | ? | |
| Jul 9, 2021 | Papakonstantinou | ½–½ | Tomic | Paracin Open | A | ? | |
| Jul 8, 2021 | Papakonstantinou | 1–0 | Korkmaz | Serbia Chess Open | Masters | ? | |
| Jul 6, 2021 | Dimitrijevic | * | Papakonstantinou | Serbia Chess Open | Masters | ? | |
| Jul 5, 2021 | Papakonstantinou | * | Stamatiou | Serbia Chess Open | Masters | ? | |
| Jul 4, 2021 | Sargsyan | 1–0 | Papakonstantinou | Serbia Chess Open | Masters | ? | |
| Jul 3, 2021 | Papakonstantinou | ½–½ | Polschikov | Serbia Chess Open | Masters | ? | |
| Jul 3, 2021 | Stukan | 1–0 | Papakonstantinou | Serbia Chess Open | Masters | ? | |
| Jul 2, 2021 | Papakonstantinou | 1–0 | Blohberger | Serbia Chess Open | Masters | ? | |
| — | Papakonstantinou | 1–0 | Lubbe | National Greek Team Championship | Scotch Game: Mieses Variation | |
| — | Sandalakis | 0–1 | Papakonstantinou | National Greek Team Championship | Ruy Lopez: Morphy Defense | |