| Dec 2, 2025 | Nikolaidis | ½–½ | Kotronias | Round 2: Nikolaidis, Ioannis - Kotronias, Vasilios | King's Indian Defense: Makogonov Variation | |
| Dec 2, 2025 | Nikolaidis | ½–½ | Krallis | Round 4: Nikolaidis, Ioannis - Krallis, Christos | Benoni Defense | |
| Dec 2, 2025 | Nikolaidis | ½–½ | Tsarsitalidis | Round 6: Nikolaidis, Ioannis - Tsarsitalidis, Konstantinos | Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation | |
| Dec 2, 2025 | Nikolaidis | 0–1 | Alexakis | Round 8: Nikolaidis, Ioannis - Alexakis, Dimitris | Benko Gambit Accepted: Fully Accepted Variation | |
| Dec 2, 2025 | Mastrovasilis | ½–½ | Nikolaidis | Round 1: Mastrovasilis, Athanasios - Nikolaidis, Ioannis | Nimzo-Indian Defense: St. Petersburg Variation, Fischer Variation | |
| Dec 2, 2025 | Patrelakis | ½–½ | Nikolaidis | Round 3: Patrelakis, Evaggelos - Nikolaidis, Ioannis | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Dec 2, 2025 | Kalogridis | 1–0 | Nikolaidis | Round 5: Kalogridis, Antonios - Nikolaidis, Ioannis | Rapport-Jobava System | |
| Dec 2, 2025 | Ioannidis | ½–½ | Nikolaidis | Round 7: Ioannidis, Evgenios - Nikolaidis, Ioannis | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Dec 2, 2025 | Kourkoulos-Arditis | ½–½ | Nikolaidis | Round 9: Kourkoulos-Arditis, Stamatis - Nikolaidis, Ioannis | Ruy Lopez: Berlin Defense | |
| Jul 6, 2025 | Galopoulos | ½–½ | Nikolaidis | Final: Galopoulos, Nikolaos - Nikolaidis, Ioannis | Indian Defense: Seirawan Attack | |
| Jul 5, 2025 | Nikolaidis | ½–½ | Kalogeris | Semi-Finals: Nikolaidis, Ioannis - Kalogeris, Ioannis | Bogo-Indian Defense: Monticelli Trap | |
| Jul 4, 2025 | Krallis | ½–½ | Nikolaidis | Round 7: Krallis, Christos - Nikolaidis, Ioannis | Ruy Lopez: Closed, Flohr System | |
| Jul 3, 2025 | Nikolaidis | 1–0 | Tzagarakis | Round 6: Nikolaidis, Ioannis - Tzagarakis, Panagiotis | Bogo-Indian Defense: Wade-Smyslov Variation | |
| Jul 3, 2025 | Nikolaidis | ½–½ | Papaioannou | Round 3: Nikolaidis, Ioannis - Papaioannou, Ioannis | Queen's Gambit Accepted: Central Variation, Alekhine System | |
| Jul 3, 2025 | Koutoukidis | 0–1 | Nikolaidis | Round 2: Koutoukidis, Panagiotis - Nikolaidis, Ioannis | Caro-Kann Defense: Tartakower Variation | |
| Jul 3, 2025 | Kouskoutis | 0–1 | Nikolaidis | Round 5: Kouskoutis, Georgios-Alexandros - Nikolaidis, Ioannis | English Opening: Agincourt Defense | |
| Jun 22, 2025 | Nikolaidis | ½–½ | Sidiropoulos | 43rd Hybrid Greek Cup F8 | Grünfeld Defense: Exchange Variation, Modern Exchange Variation | |
| Jun 8, 2025 | Halkias | 1–0 | Nikolaidis | 43rd Hybrid Greek Cup 2025 F16 | Queen's Pawn Game: Symmetrical Variation | |
| Jun 1, 2025 | Nikolaidis | ½–½ | Patrelakis | Round 6: Nikolaidis, Ioannis - Patrelakis, Evaggelos | Queen's Gambit Declined: Semi-Tarrasch Defense | |
| May 31, 2025 | Dounis | 1–0 | Nikolaidis | Round 5: Dounis, Alexandros - Nikolaidis, Ioannis | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| Apr 12, 2025 | Lazov | ½–½ | Nikolaidis | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | Caro-Kann Defense: Advance Variation, Short Variation | |
| Jul 10, 2024 | Hristodoulou | ½–½ | Nikolaidis | Greek League 2024 | Vienna Game: Falkbeer Variation | |
| Jul 9, 2024 | Nikolaidis | ½–½ | Raptis | Greek League 2024 | East Indian Defense | |
| Jul 8, 2024 | Mastrovasilis | ½–½ | Nikolaidis | Greek League 2024 | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | |
| Jul 7, 2024 | Kelires | 1–0 | Nikolaidis | Greek League 2024 | Catalan Opening | |
| Jul 6, 2024 | Nikolaidis | ½–½ | Krallis | Greek League 2024 | Sicilian Defense: Old Sicilian | |
| Jul 5, 2024 | Nikolaidis | 1–0 | Sandalakis | Greek League 2024 | Semi-Slav Defense: Anti-Moscow Gambit | |
| Jul 4, 2024 | Tsarsitalidis | ½–½ | Nikolaidis | Greek League 2024 | Italian Game: Classical Variation, Giuoco Pianissimo, with a6 | |
| May 2, 2024 | Nikolaidis | 0–1 | Singh Sahib | Round 9: Nikolaidis, Ioannis - Singh Sahib | Slav Defense: Quiet Variation, Schallopp Defense | |
| May 1, 2024 | Kotronias | ½–½ | Nikolaidis | Round 8: Kotronias, Vasilios - Nikolaidis, Ioannis | Ruy Lopez: Closed, Flohr System | |
| Apr 30, 2024 | Nikolaidis | 1–0 | Tripathi Adarsh | Round 7: Nikolaidis, Ioannis - Tripathi Adarsh | Queen's Pawn Game: Zukertort Variation | |
| Apr 29, 2024 | Kapnisis | ½–½ | Nikolaidis | Round 6: Kapnisis, Spyridon - Nikolaidis, Ioannis | French Defense: Exchange Variation, Monte Carlo Variation | |
| Apr 28, 2024 | Nikolaidis | ½–½ | Krallis | Round 5: Nikolaidis, Ioannis - Krallis, Christos | Bogo-Indian Defense: Retreat Variation | |
| Apr 28, 2024 | Szpar | ½–½ | Nikolaidis | Round 4: Szpar, Milosz - Nikolaidis, Ioannis | Scotch Game: Potter Variation | |
| Apr 27, 2024 | Alexakis | ½–½ | Nikolaidis | Round 3: Alexakis, Dimitris - Nikolaidis, Ioannis | Ruy Lopez: Berlin Defense | |
| Apr 26, 2024 | Nikolaidis | 1–0 | Rahmanidis | Round 2: Nikolaidis, Ioannis - Rahmanidis, Petros | Queen's Gambit Declined: Three Knights Variation | |
| Apr 25, 2024 | Kosakowski | 1–0 | Nikolaidis | Round 1: Kosakowski, Jakub - Nikolaidis, Ioannis | Caro-Kann Defense: Tartakower Variation | |
| Aug 17, 2022 | Korpa | 1–0 | Nikolaidis | National Greek Team Championship | Rapport-Jobava System | |
| Aug 16, 2022 | Nikolaidis | 1–0 | Tzoumbas | National Greek Team Championship | Queen's Indian Defense: Classical Variation | |
| Aug 15, 2022 | Nikolaidis | ½–½ | Kelires | National Greek Team Championship | King's Indian Attack: Yugoslav Variation | |
| Aug 14, 2022 | Halkias | 0–1 | Nikolaidis | National Greek Team Championship | Queen's Gambit Declined: Semi-Tarrasch Defense | |
| Aug 13, 2022 | Halkias | 0–1 | Nikolaidis | National Greek Team Championship | Queen's Pawn Game: London System | |
| Aug 13, 2022 | Galopoulos | ½–½ | Nikolaidis | National Greek Team Championship | Queen's Gambit Declined: Three Knights Variation | |
| Dec 12, 2021 | Nikolaidis | * | Kotronias | 70th Greek Championship 2021 | ? | |
| Dec 11, 2021 | Mastrovasilis | ½–½ | Nikolaidis | 70th Greek Championship 2021 | Nimzo-Indian Defense | |
| Dec 10, 2021 | Nikolaidis | 1–0 | Kapnisis | 70th Greek Championship 2021 | Queen's Gambit Declined: Three Knights, Vienna Variation | |
| Dec 9, 2021 | Alexakis | ½–½ | Nikolaidis | 70th Greek Championship 2021 | Caro-Kann Defense: Tartakower Variation | |
| Dec 8, 2021 | Nikolaidis | ½–½ | Kourkoulos-Arditis | 70th Greek Championship 2021 | King's Indian Defense: Makogonov Variation | |
| Dec 7, 2021 | Mitsis | ½–½ | Nikolaidis | 70th Greek Championship 2021 | Slav Defense: Quiet Variation, Pin Defense | |
| Dec 6, 2021 | Nikolaidis | 0–1 | Kanakaris | 70th Greek Championship 2021 | King's Indian Defense: Makogonov Variation | |
| Dec 5, 2021 | Trimitzios | ½–½ | Nikolaidis | 70th Greek Championship 2021 | Queen's Gambit Declined: Tartakower Defense | |
| Dec 4, 2021 | Nikolaidis | ½–½ | Ioannidis | 70th Greek Championship 2021 | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Sep 12, 2021 | Meshkovs | 0–1 | Nikolaidis | Greek Team Championship | Queen's Pawn Game: Zukertort Variation | |
| Sep 11, 2021 | Nikolaidis | 0–1 | Lagarde | Greek Team Championship | East Indian Defense | |
| Sep 10, 2021 | Kalesis | 0–1 | Nikolaidis | Greek Team Championship | Nimzo-Indian Defense: Classical Variation | |
| Sep 9, 2021 | Nikolaidis | ½–½ | Halkias | Greek Team Championship | King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System | |
| Sep 8, 2021 | Nikolaidis | ½–½ | Banikas | Greek Team Championship | Queen's Gambit Accepted: Central Variation, Alekhine System | |
| Sep 8, 2021 | Jianu | ½–½ | Nikolaidis | Greek Team Championship | Slav Defense: Exchange Variation | |
| Sep 7, 2021 | Zysk | 0–1 | Nikolaidis | Greek Team Championship | Queen's Gambit Declined: Tartakower Defense, Makogonov Exchange Variation | |
| — | Nikolaidis | ½–½ | Mitsis | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation | |
| — | Nikolaidis | 1–0 | Krallis | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| — | Nikolaidis | ½–½ | Czernek | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| — | Nikolaidis | ½–½ | Kotronias | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | Tarrasch Defense: Classical Variation | |
| — | Roinos | 0–1 | Nikolaidis | National Greek Team Championship | Caro-Kann Defense: Panov Attack, Main Line | |
| — | Risteski | 1–0 | Nikolaidis | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | Caro-Kann Defense: Advance Variation | |
| — | Dobrovoljc | ½–½ | Nikolaidis | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| — | Kapnisis | ½–½ | Nikolaidis | Piraeus GM Norm Tournament 'BOGDANOS MEMORIAL' | Caro-Kann Defense: Advance Variation | |