| Jan 7, 2026 | Dimakis | 1–0 | Kalogeropoulos | Round 7: Dimakis, Evangelos - Kalogeropoulos, Konstantinos | Ruy Lopez: Berlin Defense, Beverwijk Variation | |
| Jan 6, 2026 | Kalogeropoulos | ½–½ | Koutsioumpos | Round 6: Kalogeropoulos, Konstantinos - Koutsioumpos, Ioannis | Scandinavian Defense: Valencian Variation | |
| Jan 4, 2026 | Pagomenakis | 0–1 | Kalogeropoulos | Round 4: Pagomenakis, Achilleas - Kalogeropoulos, Konstantinos | Italian Game: Giuoco Piano | |
| Jan 3, 2026 | Kalogeropoulos | 1–0 | Di Giorgio | Round 3: Kalogeropoulos, Konstantinos - Di Giorgio, Victor | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Jan 3, 2026 | Eleftheriou | 0–1 | Kalogeropoulos | Round 2: Eleftheriou, Iasonas - Kalogeropoulos, Konstantinos | Four Knights Game: Spanish Variation, Double Spanish | |
| Dec 31, 2025 | Kalogeropoulos | 0–1 | Zacharakis | Round 5: Kalogeropoulos, Konstantinos - Zacharakis, Ilias | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jul 11, 2025 | Mekolli | 0–1 | Kalogeropoulos | Round 8: Mekolli, Iraklis - Kalogeropoulos, Konstantinos | Italian Game: Classical Variation, Giuoco Pianissimo, with a6 | |
| Jul 8, 2025 | Kalogeropoulos | 0–1 | Alexandrakis | Round 4: Kalogeropoulos, Konstantinos - Alexandrakis, Vasileios Sp | Caro-Kann Defense: Exchange Variation | |
| Jul 8, 2025 | Kalogeropoulos | ½–½ | Kotovos | Round 3: Kalogeropoulos, Konstantinos - Kotovos, Konstantinos | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Jul 7, 2025 | Katsoulis | 0–1 | Kalogeropoulos | Round 2: Katsoulis, Nikolaos - Kalogeropoulos, Konstantinos | Sicilian Defense: Hyperaccelerated Fianchetto | |
| Jul 6, 2025 | Kalogeropoulos | 1–0 | Maragkakis | Round 1: Kalogeropoulos, Konstantinos - Maragkakis, Emmanouil | Italian Game: Classical Variation, Greco Gambit, Traditional Line | |
| Jul 6, 2025 | Kalogeropoulos | ½–½ | Kalonomos | Round 9: Kalogeropoulos, Konstantinos - Kalonomos, Ioannis | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Apr 27, 2025 | Patsiotis | 0–1 | Kalogeropoulos | Round 7: Patsiotis, Konstantinos - Kalogeropoulos, Konstantinos | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Apr 26, 2025 | Kalogeropoulos | ½–½ | Tsigkogiannis | Round 6: Kalogeropoulos, Konstantinos - Tsigkogiannis, Panagiotis | Caro-Kann Defense: Panov Attack, Modern Defense | |
| Apr 25, 2025 | Nikitakis | 1–0 | Kalogeropoulos | Round 5: Nikitakis, Michail - Kalogeropoulos, Konstantinos | Ruy Lopez: Open, Bernstein Variation | |
| Apr 23, 2025 | Kalogeropoulos | 1–0 | Rompanos | Round 3: Kalogeropoulos, Konstantinos - Rompanos, Alexandros | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Apr 23, 2025 | Koutsioumpos | 0–1 | Kalogeropoulos | Round 2: Koutsioumpos, Ioannis - Kalogeropoulos, Konstantinos | Italian Game: Two Knights Defense | |
| Jun 28, 2024 | Kalogeropoulos | 1–0 | Zachos | Round 9: Kalogeropoulos, Konstantinos - Zachos, Konstantinos | Sicilian Defense: Modern Variations, Main Line | |
| Jun 26, 2024 | Kalogeropoulos | ½–½ | Kokolakis | Round 7: Kalogeropoulos, Konstantinos - Kokolakis, Pavlos | Italian Game: Giuoco Pianissimo | |
| Jun 24, 2024 | Stefanis | 1–0 | Kalogeropoulos | Round 4: Stefanis, Stefanos G - Kalogeropoulos, Konstantinos | Italian Game: Giuoco Pianissimo, Canal Variation | |
| Jun 23, 2024 | Kalogeropoulos | ½–½ | Evangelis | Round 3: Kalogeropoulos, Konstantinos - Evangelis, Markos Theofanis | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Jun 23, 2024 | Koutsioumpos | 1–0 | Kalogeropoulos | Round 2: Koutsioumpos, Ioannis - Kalogeropoulos, Konstantinos | Italian Game: Giuoco Piano | |
| Jun 22, 2024 | Kalogeropoulos | 1–0 | Di Giorgio | Round 1: Kalogeropoulos, Konstantinos - Di Giorgio, Victor | Italian Game: Giuoco Pianissimo | |
| May 11, 2024 | Kalogeropoulos | 0–1 | Toumpakaris | Round 6: Kalogeropoulos, Konstantinos - Toumpakaris, Grigorios Emmanouil | Italian Game: Two Knights Defense, Polerio Defense | |
| May 9, 2024 | Kalogeropoulos | 0–1 | Zacharakis | Round 4: Kalogeropoulos, Konstantinos - Zacharakis, Ilias | Four Knights Game: Spanish Variation, Classical Variation | |
| May 7, 2024 | Doukas | ½–½ | Kalogeropoulos | Round 1: Doukas, Nikolaos - Kalogeropoulos, Konstantinos | Scotch Game: Classical Variation | |
| Dec 28, 2024 | Armaos | 1–0 | Kalogeropoulos | Round 1: Armaos, Michail - Kalogeropoulos, Konstantinos | King's Indian Defense: Smyslov Variation | |
