| 31 ago 2026 | Safarov, Deniel 2251 | Koutlas, Nikolaos 2390 | 0-1 | A14 Apertura Inglesa: Agincourt Defense, Neo-Catalan Declined, Early b3 | 1st Gazi International Open Chess Tournament | Category A | 51 | Ver |
| 23 ago 2026 | Ajay Santhosh Parvathareddy 2480 | Koutlas, Nikolaos 2390 | ½-½ | D27 Gambito de Dama aceptado: Classical Defense, Rubinstein Variation | Kanizsa Open | 9 | Ver |
| 22 ago 2026 | Koutlas, Nikolaos 2390 | Md Imran 2503 | 1-0 | B15 Defensa Caro-Kann: Tartakower Variation | Kanizsa Open | 41 | Ver |
| 21 ago 2026 | Banusz, Tamas 2598 | Koutlas, Nikolaos 2390 | 1-0 | A30 Apertura Inglesa: Symmetrical Variation | Kanizsa Open | 56 | Ver |
| 20 ago 2026 | Koutlas, Nikolaos 2390 | Sjugirov, Sanan 2548 | ½-½ | B47 Defensa Siciliana: Taimanov Variation, Bastrikov Variation | Kanizsa Open | 9 | Ver |
| 19 ago 2026 | Neelash Saha 2471 | Koutlas, Nikolaos 2390 | ½-½ | D37 Gambito de Dama rehusado: Vienna Variation, Quiet Variation | Kanizsa Open | 88 | Ver |
| 18 ago 2026 | Koutlas, Nikolaos 2390 | Volokitin, Andrei 2614 | ½-½ | B51 Defensa Siciliana: Moscow Variation | Kanizsa Open | 37 | Ver |
| 17 ago 2026 | Gschnitzer, Adrian 2435 | Koutlas, Nikolaos 2390 | 0-1 | D02 Apertura de Peón de Dama: London System | Kanizsa Open | 28 | Ver |
| 16 ago 2026 | Koutlas, Nikolaos 2390 | Jumabayev, Rinat 2572 | 1-0 | C50 Apertura Italiana: Giuoco Pianissimo, Italian Four Knights Variation | Kanizsa Open | 71 | Ver |
| 15 ago 2026 | Colev, Ivor 2220 | Koutlas, Nikolaos 2390 | 0-1 | B90 Defensa Siciliana: Najdorf Variation | Kabizsa Open | 31 | Ver |
| 7 ago 2026 | Koutlas, Nikolaos 2390 | Akhmedinov, Satbek 2400 | 1-0 | E71 Defensa India de Rey: Karpov System | Quarterfinals | Game 1: Koutlas, Nikolaos - Akhmedinov, Satbek | 63 | Ver |
| 4 ago 2026 | Alimbetov, Dias 2149 | Koutlas, Nikolaos 2390 | 1-0 | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | Round 1 | Game 2: Alimbetov, Dias - Koutlas, Nikolaos | 56 | Ver |
| 4 ago 2026 | Koutlas, Nikolaos 2390 | Alimbetov, Dias 2149 | ½-½ | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo, with a4 a5 | FIDE World University Teams Championship (OVER-THE-BOARD FINALS) | 72 | Ver |
| 10 jul 2026 | Koutlas, Nikolaos 2368 | Dimitrov, Atanas 2245 | 1-0 | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo | 53rd Greek Team Championship 2026 | 36 | Ver |
| 10 jul 2026 | Petkidis, Anthony 2420 | Koutlas, Nikolaos 2368 | ½-½ | A05 Ataque Indio de Rey: Symmetrical Defense | 53rd Greek Team Championship 2026 | 53 | Ver |
| 10 jul 2026 | Koutoukidis, Panagiotis 2373 | Koutlas, Nikolaos 2368 | 0-1 | E05 Apertura Catalana: Open Defense, Classical Line | 53rd Greek Team Championship 2026 | 48 | Ver |
| 8 jul 2026 | Mitsis, Georgios 2349 | Koutlas, Nikolaos 2368 | 0-1 | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | 53rd Greek Team Championship 2026 | 48 | Ver |
| 6 jul 2026 | Papasimakopoulos, Alexandros 2353 | Koutlas, Nikolaos 2368 | ½-½ | A30 Apertura Inglesa: Symmetrical Variation | 53rd Greek Team Championship 2026 | 60 | Ver |
| 6 jul 2026 | Koutlas, Nikolaos 2368 | Papadopoulos, Georgios 2359 | 0-1 | B90 Defensa Siciliana: Scheveningen Variation, English Attack, with f3 | 53rd Greek Team Championship 2026 | 65 | Ver |
| 17 may 2026 | Koutlas, Nikolaos 2360 | Rodrigue-Lemieux, Shawn 2533 | 1-0 | A16 Apertura Inglesa: Anglo-Indian Defense, Queen's Knight Variation | rated rapid game | 37 | Ver |