| Jun 30, 2026 | Markidis | ½–½ | Salci | Round 2: Markidis, Konstantinos - Salci, Aytug Celal | Sicilian Defense: French Variation | |
| Jun 29, 2026 | Shubin | 1–0 | Markidis | Round 1: Shubin, Kirill - Markidis, Konstantinos | French Defense: Rubinstein Variation, Blackburne Defense | |
| Oct 26, 2025 | Trendafilov | ½–½ | Markidis | Round 11: Trendafilov, Simeon - Markidis, Konstantinos | King's Indian Attack | |
| Oct 26, 2025 | Markidis | ½–½ | Ivanov | Round 10: Markidis, Konstantinos - Ivanov, Svetlen | Sicilian Defense: French Variation | |
| Oct 26, 2025 | Petrov | 1–0 | Markidis | Round 9: Petrov, Martin - Markidis, Konstantinos | French Defense: Steinitz Variation | |
| Oct 26, 2025 | Markidis | ½–½ | Nikolov | Round 8: Markidis, Konstantinos - Nikolov, Momchil | Sicilian Defense: O'Kelly Variation, Maróczy Bind, Geller Line | |
| Oct 26, 2025 | Elci | 0–1 | Markidis | Round 7: Elci, Eren - Markidis, Konstantinos | Nimzo-Indian Defense: Classical Variation | |
| Oct 25, 2025 | Markidis | 1–0 | Rasheva | Round 6: Markidis, Konstantinos - Rasheva, Nora | Sicilian Defense: Hyperaccelerated Dragon | |
| Oct 25, 2025 | Tilicheev | 1–0 | Markidis | Round 5: Tilicheev, Viacheslav - Markidis, Konstantinos | Catalan Opening: Closed | |
| Oct 25, 2025 | Markidis | ½–½ | Spasov | Round 4: Markidis, Konstantinos - Spasov, Vasil | Pirc Defense | |
| Oct 25, 2025 | Delchev | 0–1 | Markidis | Round 3: Delchev, Aleksander - Markidis, Konstantinos | Zukertort Opening | |
| Oct 25, 2025 | Georgiev | 0–1 | Markidis | Round 1: Georgiev, Marin J. - Markidis, Konstantinos | Indian Defense: Normal Variation | |
| Oct 25, 2025 | Markidis | 1–0 | Kamenov | Round 2: Markidis, Konstantinos - Kamenov, Valentin | Pirc Defense | |
| Jul 29, 2025 | Bronstein | 1–0 | Markidis | Round 3: Bronstein, Or - Markidis, Konstantinos | Queen's Gambit Declined: Charousek Variation | |
| Jul 24, 2025 | Barak | ½–½ | Markidis | Round 7: Barak, Gil - Markidis, Konstantinos | Rapport-Jobava System | |
| Jul 23, 2025 | Markidis | ½–½ | Ballas | Round 6: Markidis, Konstantinos - Ballas, Athanasios-panagiotis | Sicilian Defense: French Variation | |
| Jul 22, 2025 | Skodras | ½–½ | Markidis | Round 5: Skodras, Marios Konstantinos - Markidis, Konstantinos | Sicilian Defense: French Variation | |
| Apr 17, 2025 | Yildirim | ½–½ | Markidis | paphos2025 | French Defense: Tarrasch Variation, Open System | |
| Apr 16, 2025 | Markidis | 0–1 | Hamitevici | paphos2025 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Apr 15, 2025 | Postny | ½–½ | Markidis | paphos2025 | Queen's Gambit Declined: Charousek Variation | |
| Apr 14, 2025 | Markidis | ½–½ | Tsaknakis | paphos2025 | Ruy Lopez: Morphy Defense | |
| Apr 14, 2025 | Markidis | 1–0 | Knaak | paphos2025 | Ruy Lopez: Closed, Anti-Marshall | |
| Apr 13, 2025 | Oganian | ½–½ | Markidis | paphos2025 | Catalan Opening: Closed | |
| Apr 12, 2025 | Markidis | ½–½ | Nevednichy | paphos2025 | French Defense: Exchange Variation | |
| Apr 12, 2025 | Sofokleous | 0–1 | Markidis | paphos2025 | Nimzo-Indian Defense | |
| Mar 3, 2025 | Alexiadis | ½–½ | Markidis | Round 7: Alexiadis, Hristos - Markidis, Konstantinos | English Opening: Agincourt Defense | |
| Mar 2, 2025 | Markidis | 1–0 | Ardenski | Round 6: Markidis, Konstantinos - Ardenski, Dimitar | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Mar 2, 2025 | Karakasidis | 0–1 | Markidis | Round 5: Karakasidis, Michail - Markidis, Konstantinos | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Feb 27, 2025 | Melikhov | ½–½ | Markidis | Round 1: Melikhov, Evgeny V. - Markidis, Konstantinos | Queen's Gambit Declined: Charousek Variation | |
| Jul 5, 2024 | Markidis | 0–1 | Makridis | Greek League 2024 | Sicilian Defense: Moscow Variation | |
| May 2, 2024 | Michaelides | 1–0 | Markidis | Round 9: Michaelides, Konstantinos - Markidis, Konstantinos | Torre Attack: Classical Defense, Nimzowitsch Variation | |
| May 1, 2024 | Markidis | 1–0 | Suder | Round 8: Markidis, Konstantinos - Suder, Jakub | Sicilian Defense: Moscow Variation | |
| Apr 30, 2024 | Dzida | ½–½ | Markidis | Round 7: Dzida, Kamil - Markidis, Konstantinos | Semi-Slav Defense | |
| Apr 29, 2024 | Kelires | 1–0 | Markidis | Round 6: Kelires, Andreas - Markidis, Konstantinos | French Defense: Advance Variation, Euwe Variation | |
| Apr 29, 2024 | Markidis | 1–0 | Martin | Round 5: Markidis, Konstantinos - Martin, Julian | Sicilian Defense: Moscow Variation | |
| Apr 28, 2024 | Markidis | ½–½ | Mastrovasilis | Round 4: Markidis, Konstantinos - Mastrovasilis, Athanasios | Sicilian Defense: French Variation | |
| Mar 18, 2024 | Markidis | ½–½ | Rahmanidis | Round 7: Markidis, Konstantinos - Rahmanidis, Petros | Sicilian Defense: Moscow Variation | |
| Mar 17, 2024 | Markidis | ½–½ | Giannoulakis | Round 6: Markidis, Konstantinos - Giannoulakis, Lampros | Ruy Lopez: Closed, Chigorin Defense | |
| Mar 17, 2024 | Bougas | 0–1 | Markidis | Round 5: Bougas, Georgios - Markidis, Konstantinos | Sicilian Defense: Taimanov Variation | |
| Mar 16, 2024 | Markidis | 1–0 | Ouzounis | Round 4: Markidis, Konstantinos - Ouzounis, Konstantinos Kyr | Ruy Lopez: Morphy Defense, Classical Defense Deferred | |
| Mar 16, 2024 | Tagkaloglou | ½–½ | Markidis | Round 3: Tagkaloglou, Savvas Stefanos - Markidis, Konstantinos | Queen's Gambit Declined: Ragozin Defense, Alekhine Variation | |
| Mar 15, 2024 | Markidis | ½–½ | Alexandri | Round 2: Markidis, Konstantinos - Alexandri, Dimitra | Ruy Lopez: Closed, Keres Defense | |
| Mar 14, 2024 | Haralabidou | 0–1 | Markidis | Round 1: Haralabidou, Maria - Markidis, Konstantinos | French Defense: MacCutcheon Variation, Exchange Variation | |
| Aug 5, 2024 | Baasansuren | ½–½ | Markidis | Round 9: Baasansuren, Erdene - Markidis, Konstantinos | Catalan Opening: Closed | |
| Aug 4, 2024 | Markidis | ½–½ | Papadopoulos | Round 8: Markidis, Konstantinos - Papadopoulos, Ioannis K. | Sicilian Defense: Moscow Variation | |
| Aug 3, 2024 | Markidis | ½–½ | Kalogridis | Round 7: Markidis, Konstantinos - Kalogridis, Antonios | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Aug 2, 2024 | Kanakaris | ½–½ | Markidis | Round 6: Kanakaris, Georgios - Markidis, Konstantinos | Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation | |
| Aug 1, 2024 | Markidis | 1–0 | Nalbandyan | Round 5: Markidis, Konstantinos - Nalbandyan, Vahan | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Jul 31, 2024 | Szpar | 1–0 | Markidis | Round 4: Szpar, Milosz - Markidis, Konstantinos | French Defense: Classical Variation, Steinitz Variation | |
| Jul 30, 2024 | Markidis | ½–½ | Camlar | Round 3: Markidis, Konstantinos - Camlar, Arda | French Defense: Advance Variation | |
| Jul 30, 2024 | Matsumura | 0–1 | Markidis | Round 2: Matsumura, Cocoro - Markidis, Konstantinos | Sicilian Defense: Taimanov Variation | |
| Apr 13, 2023 | Terentiev | 1–0 | Markidis | Paphos | English Opening: Neo-Catalan Declined | |
| Apr 12, 2023 | Markidis | ½–½ | Isaakidis | Paphos | Ruy Lopez: Open | |
| Apr 11, 2023 | Samani | ½–½ | Markidis | Paphos | King's Indian Attack: Pachman System | |
| Apr 10, 2023 | Alexakis | ½–½ | Markidis | Paphos | French Defense: Burn Variation | |
| Apr 9, 2023 | Markidis | ½–½ | Kucza | Paphos | Ruy Lopez: Open Berlin Defense, l'Hermet Variation | |
| Apr 8, 2023 | Pezelj | ½–½ | Markidis | Paphos | Semi-Slav Defense: Normal Variation | |
| Dec 11, 2022 | Markidis | ½–½ | Mitsis | 71st Greek Championship 2022 | Ruy Lopez: Closed, Flohr System | |
| Dec 10, 2022 | Naoum | ½–½ | Markidis | 71st Greek Championship 2022 | Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line | |
| Dec 9, 2022 | Markidis | ½–½ | Moutousis | 71st Greek Championship 2022 | Ruy Lopez: Closed, Anti-Marshall | |
| Dec 8, 2022 | Skembris | ½–½ | Markidis | 71st Greek Championship 2022 | English Opening: Agincourt Defense | |
| Dec 7, 2022 | Alexiadis | 0–1 | Markidis | 71st Greek Championship 2022 | Neo-Grünfeld Defense: Classical Variation, Original Defense | |
| Dec 6, 2022 | Markidis | ½–½ | Koutlas | 71st Greek Championship 2022 | Sicilian Defense: Moscow Variation | |
| Dec 5, 2022 | Alexakis | 1–0 | Markidis | 71st Greek Championship 2022 | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Dec 4, 2022 | Markidis | 1–0 | Marinakis | 71st Greek Championship 2022 | Sicilian Defense: Moscow Variation | |
| Dec 3, 2022 | Trimitzios | 1–0 | Markidis | 71st Greek Championship 2022 | English Opening: Neo-Catalan | |
| Aug 15, 2022 | Markidis | * | Pagonis | National Greek Team Championship | ? | |
| Aug 13, 2022 | Markidis | ½–½ | Pavlidis | National Greek Team Championship | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Aug 13, 2022 | Vlahos | 0–1 | Markidis | National Greek Team Championship | English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | |
| Aug 2, 2022 | Maltsevskaya | 1–0 | Markidis | 31st Internation Chess Tournament | French Defense: MacCutcheon Variation, Dr. Olland Variation | |
| Aug 1, 2022 | Markidis | ½–½ | Koutlas | 31st Internation Chess Tournament | Sicilian Defense: Moscow Variation | |
| Jul 31, 2022 | Zawadzka | ½–½ | Markidis | 31st Internation Chess Tournament | French Defense: MacCutcheon Variation, Dr. Olland Variation | |
| Jul 30, 2022 | Markidis | 0–1 | Schroeder | 31st Internation Chess Tournament | Ruy Lopez: Closed, Keres Defense | |
| Jul 29, 2022 | Can | ½–½ | Markidis | 31st Internation Chess Tournament | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Jul 28, 2022 | Markidis | 1–0 | Celik | 31st Internation Chess Tournament | Sicilian Defense: Kan Variation, Modern Variation | |
| Jul 27, 2022 | Markidis | ½–½ | Vrolijk | 31st Internation Chess Tournament | Ruy Lopez: Closed, Anti-Marshall | |
| Jul 27, 2022 | Gagare | ½–½ | Markidis | 31st Internation Chess Tournament | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Jul 24, 2022 | Markidis | 1–0 | Demchenko | 15th Paleochora Open | ? | |
| Jul 23, 2022 | Georgiadis | * | Markidis | 15th Paleochora Open | ? | |
| Jul 22, 2022 | Markidis | * | Krumina | 15th Paleochora Open | ? | |
| Jul 20, 2022 | Markidis | * | Tsarsitalidis | 15th Paleochora Open | ? | |
| Jul 19, 2022 | Kelires | ½–½ | Markidis | 15th Paleochora Open | Catalan Opening: Closed | |
| Jul 18, 2022 | Banikas | ½–½ | Markidis | 15th Paleochora Open | Semi-Slav Defense: Stoltz Variation | |
| Jul 17, 2022 | Markidis | 1–0 | Kalomiris | 15th Paleochora Open | ? | |
| Aug 8, 2021 | Markidis | ½–½ | Kevlishvili | 30th OPEN Chess International Tournament | Sicilian Defense: Moscow Variation | |
| Aug 7, 2021 | Karamichos | 0–1 | Markidis | 30th OPEN Chess International Tournament | French Defense: Tarrasch Variation, Morozevich Variation | |
| Aug 6, 2021 | Markidis | ½–½ | Stoimenidis | 30th OPEN Chess International Tournament | Ruy Lopez: Closed, Keres Defense | |
| Aug 5, 2021 | Nikolaev | ½–½ | Markidis | 30th OPEN Chess International Tournament | Sicilian Defense: Taimanov Variation, Szén Variation | |
| Aug 4, 2021 | Markidis | 0–1 | Chandra | 30th OPEN Chess International Tournament | Caro-Kann Defense: Classical Variation | |
| Aug 3, 2021 | Gkavardinas | 0–1 | Markidis | 30th OPEN Chess International Tournament | French Defense: Tarrasch Variation, Morozevich Variation | |
| Aug 2, 2021 | Markidis | * | Zaronikas | 30th OPEN Chess International Tournament | ? | |
| Aug 2, 2021 | Postny | 1–0 | Markidis | 30th OPEN Chess International Tournament | Trompowsky Attack: Classical Defense, Big Center Variation | |
| Aug 1, 2021 | Markidis | * | Mashchenko | 30th OPEN Chess International Tournament | ? | |
| Jul 29, 2021 | Spyropoulos | * | Markidis | 14th Paleochora International Tournament | English Opening: Anglo-Indian Defense | |
| Jul 29, 2021 | Spyropoulos | ½–½ | Markidis | 13th International Tournament of Paleochora | Torre Attack: Classical Defense, Nimzowitsch Variation | |
| Jul 27, 2021 | Markidis | * | Van Foreest | 13th International Tournament of Paleochora | ? | |
| Jul 26, 2021 | Markidis | * | Kotyk | 14th Paleochora International Tournament | ? | |
| Jul 26, 2021 | Markidis | * | Kotyk | 13th International Tournament of Paleochora | ? | |
| Jul 24, 2021 | Markidis | * | Luchi | 13th International Tournament of Paleochora | ? | |
| Jul 24, 2021 | Koudounis | ½–½ | Markidis | 14th Paleochora International Chess Tournament 2021 | ? | |