| 10 jul 2026 | Ketzetzis, Georgios 2277 | Nikolaidis, Ioannis 2449 | 0-1 | C56 Apertura Italiana: Scotch Gambit, Max Lange Attack | 53rd Greek Team Championship 2026 | 23 | Ver |
| 8 jul 2026 | Nikolaidis, Ioannis 2449 | Dimitrov, Atanas 2245 | ½-½ | D15 Defensa Eslava: Schlechter Variation | 53rd Greek Team Championship 2026 | 30 | Ver |
| 7 jul 2026 | Kazantzoglou, Stefanos 2345 | Nikolaidis, Ioannis 2449 | 0-1 | C90 Apertura Española (Ruy López): Closed, Pilnik Variation | 53rd Greek Team Championship 2026 | 42 | Ver |
| 6 jul 2026 | Gkoumas, Georgios 2439 | Nikolaidis, Ioannis 2449 | ½-½ | C84 Apertura Española (Ruy López): Closed, Martinez Variation | 53rd Greek Team Championship 2026 | 30 | Ver |
| 2 dic 2025 | Kourkoulos-Arditis, Stamatis 2592 | Nikolaidis, Ioannis 2457 | ½-½ | C65 Apertura Española (Ruy López): Berlin Defense, Anti-Berlin Variation | Greek National Chess Championships 2025 | Open | 47 | Ver |
| 2 dic 2025 | Nikolaidis, Ioannis 2457 | Alexakis, Dimitris 2544 | 0-1 | A58 Gambito Benko aceptado: Fully Accepted Variation | Greek National Chess Championships 2025 | Open | 24 | Ver |
| 2 dic 2025 | Ioannidis, Evgenios 2480 | Nikolaidis, Ioannis 2457 | ½-½ | D36 Gambito de Dama rehusado: Exchange Variation, Reshevsky Variation | Greek National Chess Championships 2025 | Open | 44 | Ver |
| 2 dic 2025 | Nikolaidis, Ioannis 2457 | Tsarsitalidis, Konstantinos 2223 | ½-½ | E54 Defensa Nimzoindia: Normal Variation, Gligoric System, Exchange Variation | Greek National Chess Championships 2025 | Open | 37 | Ver |
| 2 dic 2025 | Kalogridis, Antonios 2409 | Nikolaidis, Ioannis 2457 | 1-0 | D01 Rapport-Jobava System | Greek National Chess Championships 2025 | Open | 39 | Ver |
| 2 dic 2025 | Nikolaidis, Ioannis 2457 | Krallis, Christos 2416 | ½-½ | A56 Defensa Benoni | Greek National Chess Championships 2025 | Open | 47 | Ver |
| 2 dic 2025 | Patrelakis, Evaggelos 2453 | Nikolaidis, Ioannis 2457 | ½-½ | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo | Greek National Chess Championships 2025 | Open | 41 | Ver |
| 2 dic 2025 | Nikolaidis, Ioannis 2457 | Kotronias, Vasilios 2392 | ½-½ | E71 Defensa India de Rey: Karpov System | Greek National Chess Championships 2025 | Open | 63 | Ver |
| 2 dic 2025 | Mastrovasilis, Athanasios 2413 | Nikolaidis, Ioannis 2457 | ½-½ | E45 Defensa Nimzoindia: St. Petersburg Variation, Fischer Variation | Greek National Chess Championships 2025 | Open | 40 | Ver |