| Jul 24, 2026 | Sochacki | 0–1 | Kazantzoglou | Round 8: Sochacki, Christophe - Kazantzoglou, Stefanos | Sicilian Defense: Najdorf Variation | |
| Jul 23, 2026 | Kazantzoglou | ½–½ | Plat | Round 7: Kazantzoglou, Stefanos - Plat, Vojtech | Philidor Defense: Lion Variation | |
| Jul 22, 2026 | Kazantzoglou | 1–0 | Koudounis | Round 6: Kazantzoglou, Stefanos - Koudounis, Vasileios | King's Indian Attack | |
| Jul 21, 2026 | Khachatryan | ½–½ | Kazantzoglou | Round 5: Khachatryan, Anna - Kazantzoglou, Stefanos | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Jul 16, 2026 | Kazantzoglou | 0–1 | Mylonakis | Round 3: Kazantzoglou, Stefanos - Mylonakis, Ioannis | Réti Opening: Anglo-Slav Variation, with g3 | |
| Jul 16, 2026 | Mihopoulos | 1–0 | Kazantzoglou | Round 4: Mihopoulos, Konstantinos - Kazantzoglou, Stefanos | Hungarian Opening | |
| Jul 16, 2026 | Kontogianni | 0–1 | Kazantzoglou | Round 2: Kontogianni, Vasiliki (Vivian) - Kazantzoglou, Stefanos | English Opening: Romanishin Gambit | |
| Jul 15, 2026 | Kazantzoglou | 1–0 | Sklavounos | Round 5: Kazantzoglou, Stefanos - Sklavounos, Panayotis | ? | |
| Jul 12, 2026 | Kazantzoglou | 0–1 | Vassis | Round 6: Kazantzoglou, Stefanos - Vassis, Michail | French Defense: St. George Defense | |
| Jul 10, 2026 | Banikas | 1–0 | Kazantzoglou | Round 7: Banikas, Hristos - Kazantzoglou, Stefanos | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Jul 10, 2026 | Kazantzoglou | ½–½ | Tsaknakis | Round 6: Kazantzoglou, Stefanos - Tsaknakis, Zisis | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Jul 8, 2026 | Krallis | 0–1 | Kazantzoglou | Round 5: Krallis, Christos - Kazantzoglou, Stefanos | King's Indian Attack: Keres Variation | |
| Jul 7, 2026 | Kazantzoglou | 0–1 | Nikolaidis | Round 4: Kazantzoglou, Stefanos - Nikolaidis, Ioannis | Ruy Lopez: Closed, Pilnik Variation | |
| Jul 6, 2026 | Kazantzoglou | 1–0 | Dimitrov | Round 3: Kazantzoglou, Stefanos - Dimitrov, Atanas | Philidor Defense: Lion Variation | |
| Jul 6, 2026 | Kazantzoglou | 1–0 | Stefanou | Round 2: Kazantzoglou, Stefanos - Stefanou, Dimitrios | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Jul 3, 2026 | Kazantzoglou | 1–0 | Stefanou | Greek Chess Cup F4 | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Jul 2, 2026 | Kazantzoglou | 0–1 | Kourkoulos-Arditis | Greek Chess Cup F4 | King's Indian Defense: Fianchetto Variation, Larsen Defense | |
| Jun 26, 2026 | Imomkuzieva | ½–½ | Kazantzoglou | Round 11: Imomkuzieva, Nilufarkhon - Kazantzoglou, Stefanos | Sicilian Defense: Chekhover Variation | |
| Jun 25, 2026 | Kazantzoglou | ½–½ | Bazilius | Round 10: Kazantzoglou, Stefanos - Bazilius, Augustinas | French Defense: Advance Variation, Euwe Variation | |
| Jun 24, 2026 | Pavleski | 0–1 | Kazantzoglou | Round 9: Pavleski, Nikola - Kazantzoglou, Stefanos | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Jun 23, 2026 | Kazantzoglou | 0–1 | Gut | World Youth Chess Championship 2026 U18 Open | Sicilian Defense: Moscow Variation | |
| Jun 22, 2026 | Biyiksiz | 0–1 | Kazantzoglou | Round 7: Biyiksiz, Ali Batuhan - Kazantzoglou, Stefanos | Indian Defense: Anti-Nimzo-Indian | |
| Jun 20, 2026 | Kazantzoglou | 0–1 | Pironti | Round 6: Kazantzoglou, Stefanos - Pironti, Francisco Ferrari | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Jun 19, 2026 | Mamedov | 1–0 | Kazantzoglou | Round 5: Mamedov, Edgar - Kazantzoglou, Stefanos | Bogo-Indian Defense: Nimzowitsch Variation | |
| Jun 18, 2026 | Hagner | ½–½ | Kazantzoglou | Round 4: Hagner, Bennet - Kazantzoglou, Stefanos | Sicilian Defense: Najdorf Variation, Zagreb Variation | |
| Jun 17, 2026 | Kazantzoglou | ½–½ | Zhao | Round 3: Kazantzoglou, Stefanos - Zhao, Erick | King's Indian Attack: Spassky Variation | |
| Jun 16, 2026 | Kazantzoglou | 1–0 | Topuz | Round 2: Kazantzoglou, Stefanos - Topuz, Mirac Melih | Catalan Opening: Closed, Sokolsky Variation | |
| Jun 15, 2026 | Rajandu | 0–1 | Kazantzoglou | Round 1: Rajandu, Aaron - Kazantzoglou, Stefanos | Sicilian Defense: Moscow Variation | |
| May 17, 2026 | Krallis | 1–0 | Kazantzoglou | Round 3: Krallis, Christos - Kazantzoglou, Stefanos | English Opening: Romanishin Gambit | |
| Feb 23, 2026 | Kazantzoglou | 1–0 | Mavridis | Round 7: Kazantzoglou, Stefanos - Mavridis, Emmanouil | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Feb 21, 2026 | Liloni | 1–0 | Kazantzoglou | Round 4: Liloni, Francesco Mattia - Kazantzoglou, Stefanos | Sicilian Defense: Najdorf Variation | |
| Feb 21, 2026 | Kazantzoglou | 1–0 | Merkos | Round 3: Kazantzoglou, Stefanos - Merkos, Thomas | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Feb 20, 2026 | Skodras | ½–½ | Kazantzoglou | Round 2: Skodras, Marios Konstantinos - Kazantzoglou, Stefanos | King's Indian Attack: Spassky Variation | |
| Feb 19, 2026 | Kazantzoglou | 1–0 | Palaiologou | Round 1: Kazantzoglou, Stefanos - Palaiologou, Apostolos | Sicilian Defense: Closed, Traditional | |
| Feb 11, 2026 | Katsanis | 1–0 | Kazantzoglou | Round 6: Katsanis, Vasileios Dim - Kazantzoglou, Stefanos | Nimzo-Indian Defense: Classical Variation | |
| Feb 11, 2026 | Kazantzoglou | 0–1 | Kassios | Round 4: Kazantzoglou, Stefanos - Kassios, Dimitrios | English Opening: Agincourt Defense, Bogoljubow Defense | |
| Dec 5, 2025 | Kazantzoglou | ½–½ | Rahmanidis | Round 5: Kazantzoglou, Stefanos - Rahmanidis, Petros | English Opening: Agincourt Defense, Bogoljubow Defense | |
| Nov 29, 2025 | Stavropoulos | 0–1 | Kazantzoglou | Round 5: Stavropoulos, Sotirios - Kazantzoglou, Stefanos | Rubinstein Opening | |
| Nov 28, 2025 | Katsanis | ½–½ | Kazantzoglou | Round 3: Katsanis, Vasileios Dim - Kazantzoglou, Stefanos | Nimzo-Indian Defense: Sämisch Variation | |
| Nov 27, 2025 | Lampropoulos | 0–1 | Kazantzoglou | Round 1: Lampropoulos, Pavlos - Kazantzoglou, Stefanos | Scotch Game: Classical Variation | |
| Nov 25, 2025 | Kazantzoglou | 1–0 | Kassios | Round 6: Kazantzoglou, Stefanos - Kassios, Dimitrios | English Opening: Agincourt Defense, Bogoljubow Defense | |
| Nov 25, 2025 | Kazantzoglou | 1–0 | Paschalidis | Round 4: Kazantzoglou, Stefanos - Paschalidis, Nikolaos | Sicilian Defense: Modern Variations, Main Line | |
| Nov 25, 2025 | Kazantzoglou | 1–0 | Theodoridis | Round 2: Kazantzoglou, Stefanos - Theodoridis, Charalampos | King's Indian Attack | |
| Nov 6, 2025 | Papasimakopoulos | 1–0 | Kazantzoglou | Round 2: Papasimakopoulos, Alexandros - Kazantzoglou, Stefanos | Zukertort Opening | |
| Nov 2, 2025 | Perossa | 1–0 | Kazantzoglou | Round 5: Perossa, Nicolas - Kazantzoglou, Stefanos | Ruy Lopez: Morphy Defense, Tarrasch Variation | |
| Oct 30, 2025 | Kazantzoglou | ½–½ | Coicev | Round 2: Kazantzoglou, Stefanos - Coicev, Matei-Andrei | King's Indian Attack | |
| Oct 9, 2025 | Coicev | 1–0 | Kazantzoglou | Round 6: Coicev, Matei-Andrei - Kazantzoglou, Stefanos | Bishop's Opening | |
| Oct 8, 2025 | Kazantzoglou | ½–½ | Oktem | Round 5: Kazantzoglou, Stefanos - Oktem, Ege Tuna | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Oct 5, 2025 | Mulawa | 1–0 | Kazantzoglou | Round 2: Mulawa, Cyprian - Kazantzoglou, Stefanos | Ruy Lopez: Morphy Defense, Classical Defense Deferred | |
| Sep 9, 2025 | Kazantzoglou | ½–½ | Oikonomopoulos | Round 9: Kazantzoglou, Stefanos - Oikonomopoulos, Filippos | King's Indian Defense: Smyslov Variation | |
| Sep 8, 2025 | Lafkidis | 1–0 | Kazantzoglou | Round 9: Lafkidis, Apostolos - Kazantzoglou, Stefanos | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| Sep 8, 2025 | Ergazakis | 1–0 | Kazantzoglou | Round 5: Ergazakis, Ioannis - Kazantzoglou, Stefanos | Nimzo-Larsen Attack: Classical Variation | |
| Sep 8, 2025 | Kazantzoglou | 1–0 | Stratigos | Round 4: Kazantzoglou, Stefanos - Stratigos, Spiros | King's Indian Defense: Normal Variation, King's Knight Variation | |
| Sep 8, 2025 | Krallis | 0–1 | Kazantzoglou | Round 3: Krallis, Christos - Kazantzoglou, Stefanos | Scotch Game: Potter Variation | |
| Sep 8, 2025 | Armaos | 0–1 | Kazantzoglou | Round 8: Armaos, Michail - Kazantzoglou, Stefanos | Benko Gambit Accepted: Fully Accepted Variation | |
| Sep 7, 2025 | Kazantzoglou | 1–0 | Makrylakis | Round 7: Kazantzoglou, Stefanos - Makrylakis, Iason | Catalan Opening: Closed | |
| Sep 6, 2025 | Krallis | 1–0 | Kazantzoglou | Round 6: Krallis, Christos - Kazantzoglou, Stefanos | Nimzo-Larsen Attack: Classical Variation | |
| Sep 5, 2025 | Kazantzoglou | ½–½ | Poupalos | Round 5: Kazantzoglou, Stefanos - Poupalos, Nikolaos | Sicilian Defense: Moscow Variation | |
| Sep 4, 2025 | Papadopoulos | ½–½ | Kazantzoglou | Round 4: Papadopoulos, Georgios - Kazantzoglou, Stefanos | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Sep 3, 2025 | Kazantzoglou | 1–0 | Goutoufas | Round 3: Kazantzoglou, Stefanos - Goutoufas, Christos | Sicilian Defense: Moscow Variation | |
| Sep 2, 2025 | Anagnostopoulos | 0–1 | Kazantzoglou | Round 2: Anagnostopoulos, Panagiotis - Kazantzoglou, Stefanos | Catalan Opening: Open Defense | |
| Sep 1, 2025 | Kazantzoglou | 1–0 | Toumpakari | Round 1: Kazantzoglou, Stefanos - Toumpakari, Maria | King's Indian Attack: Double Fianchetto | |
| Jul 23, 2025 | Kazantzoglou | ½–½ | Hari Madhavan N B | Round 9: Kazantzoglou, Stefanos - Hari Madhavan N B | King's Indian Attack | |
| Jul 22, 2025 | Omorjan | ½–½ | Kazantzoglou | Round 8: Omorjan, Dejan - Kazantzoglou, Stefanos | Queen's Pawn Game: London System | |
| Jul 21, 2025 | Kazantzoglou | 1–0 | Vagman | Round 7: Kazantzoglou, Stefanos - Vagman, Roy | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Jul 18, 2025 | Munkhgal | 1–0 | Kazantzoglou | Round 5: Munkhgal, Gombosuren - Kazantzoglou, Stefanos | Queen's Gambit Declined: Charousek Variation | |
| Jul 4, 2025 | Kazantzoglou | 0–1 | Magkalakis | Round 7: Kazantzoglou, Stefanos - Magkalakis, Stefanos | Italian Game: Giuoco Pianissimo, Normal | |
| Jul 3, 2025 | Gkavardinas | 1–0 | Kazantzoglou | Round 6: Gkavardinas, Antonios - Kazantzoglou, Stefanos | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jul 3, 2025 | Kazantzoglou | ½–½ | Stamatiou | Round 4: Kazantzoglou, Stefanos - Stamatiou, Rodolfos | Sicilian Defense: Taimanov Variation, Szén Variation | |
| Jul 3, 2025 | Kazantzoglou | 0–1 | Kourkoulos-Arditis | Round 2: Kazantzoglou, Stefanos - Kourkoulos-Arditis, Stamatis | Italian Game: Giuoco Pianissimo, Normal | |
| Jul 3, 2025 | Dounis | 0–1 | Kazantzoglou | Round 5: Dounis, Alexandros - Kazantzoglou, Stefanos | King's Indian Attack: Keres Variation | |
| Jun 18, 2025 | Kazantzoglou | 1–0 | Panopoulos | Round 5: Kazantzoglou, Stefanos - Panopoulos, Ioannis | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jun 17, 2025 | Poullas | 0–1 | Kazantzoglou | Round 4: Poullas, Antonis - Kazantzoglou, Stefanos | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 16, 2025 | Kazantzoglou | 0–1 | Oikonomopoulos | Round 3: Kazantzoglou, Stefanos - Oikonomopoulos, Filippos | Sicilian Defense: French Variation, Westerinen Attack | |
| Jun 15, 2025 | Antoniadis | 0–1 | Kazantzoglou | Round 2: Antoniadis, Anastasios - Kazantzoglou, Stefanos | Ruy Lopez: Morphy Defense, Classical Defense Deferred | |
| Jun 14, 2025 | Kazantzoglou | 1–0 | Synetos | Round 1: Kazantzoglou, Stefanos - Synetos, Dionysios | Italian Game: Giuoco Pianissimo, Normal | |
| Jun 14, 2025 | Kazantzoglou | ½–½ | Finokaliotis | Round 9: Kazantzoglou, Stefanos - Finokaliotis, Georgios | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 14, 2025 | Mitsis | ½–½ | Kazantzoglou | Round 8: Mitsis, Georgios - Kazantzoglou, Stefanos | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 14, 2025 | Kazantzoglou | 1–0 | Ergazakis | Round 7: Kazantzoglou, Stefanos - Ergazakis, Ioannis | French Defense: Exchange Variation | |
| Jun 14, 2025 | Alexiadis | 0–1 | Kazantzoglou | Round 6: Alexiadis, Hristos - Kazantzoglou, Stefanos | King's Indian Attack | |
| Apr 13, 2025 | Kazantzoglou | 0–1 | Vassis | 13th Open Grand Prix, by SOXalandriou (Blitz) | French Defense: Exchange Variation | |
| Jan 5, 2025 | Kazantzoglou | 1–0 | Raptis | New Year's Blitz Tournament 2025, by SOXalandriou (Open) | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jan 5, 2025 | Kazantzoglou | 0–1 | Kotrotsos | New Year's Blitz Tournament 2025, by SOXalandriou (Open) | Caro-Kann Defense: Two Knights Attack | |
| Jan 4, 2025 | Kazantzoglou | 0–1 | Kassios | 11th New Year All Nighter Grand Prix, by SOXalandriou (Rapid) | Sicilian Defense: Moscow Variation | |
| Jan 4, 2025 | Tzortzis | ½–½ | Kazantzoglou | 11th New Year All Nighter Grand Prix, by SOXalandriou (Rapid) | Queen's Pawn Game: London System | |
| Jan 3, 2025 | Kazantzoglou | 1–0 | Anagnostopoulos | 11th New Year All Nighter Grand Prix, by SOXalandriou (Rapid) | French Defense: Chigorin Variation | |
| Mar 3, 2025 | Kazantzoglou | 1–0 | Makris | Round 7: Kazantzoglou, Stefanos - Makris, Spyridon-Dionysios | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Mar 2, 2025 | Kosta | 0–1 | Kazantzoglou | Round 6: Kosta, Kelvin - Kazantzoglou, Stefanos | Vienna Game: Mieses Variation | |
| Feb 27, 2025 | Kazantzoglou | ½–½ | Kalogridis | Round 1: Kazantzoglou, Stefanos - Kalogridis, Antonios | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Aug 23, 2024 | Kazantzoglou | 0–1 | Durak | EYCC 2024 - O16 | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Jul 10, 2024 | Kazantzoglou | ½–½ | Lafkidis | Greek League 2024 | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Breyer Variation | |
| Jul 9, 2024 | Tsarsitalidis | 1–0 | Kazantzoglou | Greek League 2024 | Ruy Lopez: Open, Howell Attack | |
| Jul 8, 2024 | Kazantzoglou | 1–0 | Tagkaloglou | Greek League 2024 | French Defense: Exchange Variation | |
| Jul 7, 2024 | Poupalos | 1–0 | Kazantzoglou | Greek League 2024 | Ruy Lopez: Morphy Defense, Duras Variation | |
| Jul 6, 2024 | Gkavardinas | 1–0 | Kazantzoglou | Greek League 2024 | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Jul 5, 2024 | Kazantzoglou | ½–½ | Kiryttopoulos | Greek League 2024 | Italian Game: Giuoco Pianissimo, Normal | |
| Jul 4, 2024 | Triantafyllakis | 0–1 | Kazantzoglou | Greek League 2024 | Ruy Lopez: Open | |
| Jun 21, 2024 | Kazantzoglou | ½–½ | Finokaliotis | Round 7: Kazantzoglou, Stefanos - Finokaliotis, Georgios | Caro-Kann Defense: Two Knights Attack | |
| Jun 20, 2024 | Christiansen | 1–0 | Kazantzoglou | 26th chess tournament of Iraklio Attica | Scotch Game: Potter Variation | |
| Jun 18, 2024 | Giatrakos | 0–1 | Kazantzoglou | Round 4: Giatrakos, Orestis - Kazantzoglou, Stefanos | English Opening: Agincourt Defense | |