| Mar 23, 2026 | Oikonomopoulos | 0–1 | Stefanou | 3rd International Open Chess Tournament of Katerini Group A | Sicilian Defense: Closed, Traditional | |
| Mar 21, 2026 | Stratigos | 1–0 | Stefanou | 3rd International Open Chess Tournament of Katerini Group A | Sicilian Defense: French Variation | |
| Feb 23, 2026 | Stefanou | 1–0 | Liloni | Round 7: Stefanou, Konstantinos - Liloni, Francesco Mattia | Indian Defense: Anti-Nimzo-Indian | |
| Feb 22, 2026 | Krallis | 1–0 | Stefanou | Round 6: Krallis, Christos - Stefanou, Konstantinos | Sicilian Defense: Accelerated Dragon, Modern Bc4 Variation | |
| Feb 22, 2026 | Papasimakopoulos | 0–1 | Stefanou | Round 5: Papasimakopoulos, Alexandros - Stefanou, Konstantinos | Nimzo-Indian Defense: St. Petersburg Variation, Romanishin–Psakhis Variation | |
| Feb 21, 2026 | Stefanou | ½–½ | Valsecchi | Round 4: Stefanou, Konstantinos - Valsecchi, Alessio | Nimzo-Indian Defense: Normal Variation | |
| Feb 21, 2026 | Akat | 0–1 | Stefanou | Round 3: Akat, Elifnaz - Stefanou, Konstantinos | Sicilian Defense: French Variation | |
| Feb 20, 2026 | Stefanou | 1–0 | Yordanova | Round 2: Stefanou, Konstantinos - Yordanova, Svetla | Zukertort Opening | |
| Jan 4, 2026 | Stefanou | 0–1 | Pankiv | Open A | Catalan Opening: Closed | |
| Jan 3, 2026 | Oborski | 0–1 | Stefanou | Open A | Queen's Indian Accelerated | |
| Jan 2, 2026 | Stefanou | ½–½ | Krawczyk | Open A | Queen's Indian Defense: Capablanca Variation | |
| Jan 2, 2026 | Pancewicz | ½–½ | Stefanou | Open A | Sicilian Defense: Kalashnikov Variation | |
| Dec 31, 2025 | Stefanou | 1–0 | Zarnowski | Open A | Nimzo-Indian Defense: Normal Variation | |
| Dec 30, 2025 | Janik | 1–0 | Stefanou | Open A | Sicilian Defense: French Variation | |
| Dec 29, 2025 | Stefanou | 1–0 | Kyparissopoulos | Open A | English Opening: Symmetrical Variation, Rubinstein Variation | |
| Dec 28, 2025 | Kraczek | ½–½ | Stefanou | Open A | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Dec 27, 2025 | Stefanou | ½–½ | Kozlowski | Open A | Queen's Pawn Game: Zukertort Variation | |
| Jul 30, 2025 | Stefanou | 0–1 | Sadikhov | Round 4: Stefanou, Konstantinos - Sadikhov, Ulvi | Benoni Defense: Taimanov Variation | |
| Jul 22, 2025 | Antonioudakis | 1–0 | Stefanou | Round 5: Antonioudakis, Georgios - Stefanou, Konstantinos | Modern Defense: Standard Defense | |
| Jul 21, 2025 | Stefanou | ½–½ | Nevednichy | Round 4: Stefanou, Konstantinos - Nevednichy, Vladislav | Queen's Gambit Declined: Barmen Variation | |
| Jul 4, 2025 | Stefanou | ½–½ | Kalogridis | Round 7: Stefanou, Konstantinos - Kalogridis, Themistoklis | Indian Defense: Przepiorka Variation | |
| Jul 3, 2025 | Armaos | 0–1 | Stefanou | Round 6: Armaos, Michail - Stefanou, Konstantinos | Rat Defense: English Rat | |
| Jul 3, 2025 | Papidakis | ½–½ | Stefanou | Round 4: Papidakis, Georgios - Stefanou, Konstantinos | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jul 3, 2025 | Stefanou | 1–0 | Krallis | Round 3: Stefanou, Konstantinos - Krallis, Christos | King's Indian Defense: Semi-Averbakh System | |
| Jul 3, 2025 | Katsanis | ½–½ | Stefanou | Round 2: Katsanis, Vasileios Dim - Stefanou, Konstantinos | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jul 3, 2025 | Stefanou | 1–0 | Tsitimakis | Round 1: Stefanou, Konstantinos - Tsitimakis, Periklis | King's Indian Defense: Makogonov Variation | |
| Jul 3, 2025 | Stefanou | ½–½ | Koutlas | Round 5: Stefanou, Konstantinos - Koutlas, Nikolaos | Catalan Opening: Open Defense | |
| Mar 25, 2025 | Stefanou | 0–1 | Boyer | Round 10: Stefanou, Konstantinos - Boyer, Mahel | Hungarian Opening: Symmetrical Variation | |
| Mar 19, 2025 | Stoyanov | 1–0 | Stefanou | Round 5: Stoyanov, Tsvetan - Stefanou, Konstantinos | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Mar 18, 2025 | Stefanou | ½–½ | Bodrogi | Round 4: Stefanou, Konstantinos - Bodrogi, Bendeguz | Queen's Pawn Game: Zukertort Variation | |
| Mar 15, 2025 | Grandelius | 1–0 | Stefanou | Round 1: Grandelius, Nils - Stefanou, Konstantinos | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jul 29, 2024 | Stefanou | ½–½ | Patrelakis | Round 1: Stefanou, Konstantinos - Patrelakis, Evaggelos | King's Indian Attack | |
| Jul 10, 2024 | Lampropoulos | 0–1 | Stefanou | Greek League 2024 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jul 9, 2024 | Stefanou | ½–½ | Koutlas | Greek League 2024 | English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense | |
| Jul 8, 2024 | Karamichos | 0–1 | Stefanou | Greek League 2024 | English Opening: Agincourt Defense, Catalan Defense Accepted | |
| Jul 7, 2024 | Stefanou | ½–½ | Kasioumis | Greek League 2024 | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Jul 6, 2024 | Stefanou | 1–0 | Makridis | Greek League 2024 | Nimzo-Indian Defense: Classical Variation | |
| Jul 5, 2024 | Proutsalis | 0–1 | Stefanou | Greek League 2024 | Sicilian Defense: Closed | |
| Jul 4, 2024 | Stefanou | ½–½ | Tragoudaras | Greek League 2024 | Bogo-Indian Defense: Grünfeld Variation | |
| Aug 17, 2022 | Stefanou | ½–½ | Dimakis | National Greek Team Championship | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Aug 16, 2022 | Koutlas | 1–0 | Stefanou | National Greek Team Championship | English Opening: Symmetrical Variation, Four Knights Variation | |
| Aug 15, 2022 | Stefanou | 1–0 | Poupalos | National Greek Team Championship | King's Indian Attack | |
| Aug 14, 2022 | Giannoulis | ½–½ | Stefanou | National Greek Team Championship | Sicilian Defense: Godiva Variation | |
| Aug 13, 2022 | Stefanou | 0–1 | Makridis | National Greek Team Championship | Queen's Gambit Declined: Queen's Knight Variation | |
| Aug 13, 2022 | Mitsiou | 0–1 | Stefanou | National Greek Team Championship | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Aug 12, 2022 | Stefanou | 1–0 | Aleiferis | National Greek Team Championship | Benoni Defense: Uhlmann Variation | |
| Sep 12, 2021 | Dimanoudis | 0–1 | Stefanou | Greek Team Championship | Sicilian Defense: Godiva Variation | |
| Sep 11, 2021 | Stefanou | ½–½ | Stamatiou | Greek Team Championship | Nimzo-Indian Defense: Normal Variation | |
| Sep 10, 2021 | Stefanou | 0–1 | Krallis | Greek Team Championship | Rat Defense: English Rat | |
| Sep 9, 2021 | Drakonakis | ½–½ | Stefanou | Greek Team Championship | Catalan Opening: Open Defense | |
| Sep 8, 2021 | Stefanou | 1–0 | Trapalis | Greek Team Championship | Benko Gambit Accepted: Modern Variation | |
| Sep 8, 2021 | Dristellas | 0–1 | Stefanou | Greek Team Championship | Sicilian Defense: Godiva Variation | |
| Sep 7, 2021 | Stefanou | 1–0 | Michos | Greek Team Championship | King's Indian Defense: Makogonov Variation | |
| Aug 8, 2021 | Stefanou | * | Stamatiou | 30th OPEN Chess International Tournament | ? | |
| Aug 7, 2021 | Stefanou | * | Triantafilidis | 30th OPEN Chess International Tournament | ? | |
| Aug 6, 2021 | Karakatsanis | * | Stefanou | 30th OPEN Chess International Tournament | ? | |
| Aug 5, 2021 | Stefanou | * | Townsend | 30th OPEN Chess International Tournament | ? | |
| Aug 4, 2021 | Kostov | * | Stefanou | 30th OPEN Chess International Tournament | ? | |
| Aug 3, 2021 | Stefanou | * | Deligiannis | 30th OPEN Chess International Tournament | ? | |
| Aug 2, 2021 | Stefanou | * | Andronescu | 30th OPEN Chess International Tournament | ? | |
| Aug 2, 2021 | Schnelzer | * | Stefanou | 30th OPEN Chess International Tournament | ? | |
| Aug 1, 2021 | Klimentov | * | Stefanou | 30th OPEN Chess International Tournament | ? | |
| — | Bosiocic | 1–0 | Stefanou | Round 8: Bosiocic, Marin - Stefanou, Konstantinos | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
