| Oct 25, 2025 | Barkhagen | 1–0 | Sandalakis | Round 7: Barkhagen, Jonas - Sandalakis, Nikolaos | Slav Defense: Exchange Variation | |
| Oct 24, 2025 | Sandalakis | 1–0 | Hardarson | Round 6: Sandalakis, Nikolaos - Hardarson, Jon Trausti | French Defense: Rubinstein Variation, Blackburne Defense | |
| Oct 23, 2025 | Poltorak | ½–½ | Sandalakis | Round 5: Poltorak, Sebastian - Sandalakis, Nikolaos | Vienna Game: Mieses Variation | |
| Oct 21, 2025 | Skagseth | 0–1 | Sandalakis | Round 3: Skagseth, Havard M - Sandalakis, Nikolaos | Sicilian Defense: O'Kelly Variation, Normal System | |
| Oct 20, 2025 | Sandalakis | 0–1 | Ivic | Round 2: Sandalakis, Nikolaos - Ivic, Velimir | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Jul 4, 2025 | Sandalakis | 0–1 | Tzagarakis | Round 7: Sandalakis, Nikolaos - Tzagarakis, Panagiotis | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Jul 3, 2025 | Christodoulou | 1–0 | Sandalakis | Round 6: Christodoulou, Panagiotis - Sandalakis, Nikolaos | Rapport-Jobava System | |
| Jul 3, 2025 | Sandalakis | 1–0 | Skaperdas | Round 4: Sandalakis, Nikolaos - Skaperdas, Kostantinos | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jul 3, 2025 | Poupalos | 1–0 | Sandalakis | Round 3: Poupalos, Nikolaos - Sandalakis, Nikolaos | Ruy Lopez: Closed, Martinez Variation | |
| Jul 3, 2025 | Sandalakis | ½–½ | Tsarsitalidis | Round 2: Sandalakis, Nikolaos - Tsarsitalidis, Konstantinos | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Jul 3, 2025 | Lekkas | 1–0 | Sandalakis | Round 1: Lekkas, Anastasios - Sandalakis, Nikolaos | Ruy Lopez: Closed, Anti-Marshall | |
| Jul 3, 2025 | Sandalakis | 0–1 | Stoumbos | Round 5: Sandalakis, Nikolaos - Stoumbos, Konstantinos | Sicilian Defense: Richter-Rauzer Variation | |
| Jun 8, 2025 | Sandalakis | 0–1 | Kanakaris | 43rd Hybrid Greek Cup 2025 F16 | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jul 10, 2024 | Sandalakis | 1–0 | Mitsis | Greek League 2024 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Jul 9, 2024 | Kalogridakis | ½–½ | Sandalakis | Greek League 2024 | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jul 8, 2024 | Androutsopoulos-Agiotatos | ½–½ | Sandalakis | Greek League 2024 | Sicilian Defense: Nimzowitsch Variation, Closed Variation | |
| Jul 7, 2024 | Sandalakis | ½–½ | Sandalakis | Greek League 2024 | Ruy Lopez: Closed, Flohr System | |
| Jul 6, 2024 | Sandalakis | ½–½ | Ladopoulos | Greek League 2024 | French Defense: Exchange Variation | |
| Jul 5, 2024 | Nikolaidis | 1–0 | Sandalakis | Greek League 2024 | Semi-Slav Defense: Anti-Moscow Gambit | |
| Jun 30, 2024 | Mostbauer | ½–½ | Sandalakis | Round 9: Mostbauer, Florian - Sandalakis, Nikolaos | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Jun 29, 2024 | Sandalakis | 1–0 | Ghaith Saeed Alnuaimi | Round 8: Sandalakis, Nikolaos - Ghaith Saeed Alnuaimi | Sicilian Defense: Four Knights Variation | |
| Jun 28, 2024 | Stefanova | 1–0 | Sandalakis | Round 7: Stefanova, Antoaneta - Sandalakis, Nikolaos | Slav Defense: Modern Line | |
| Jun 27, 2024 | Sandalakis | 1–0 | Rigopoulos-Tsigkos | Round 6: Sandalakis, Nikolaos - Rigopoulos-Tsigkos, Alexandros | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Jun 26, 2024 | Mickiewicz | 0–1 | Sandalakis | Round 5: Mickiewicz, Piotr - Sandalakis, Nikolaos | English Opening: King's English Variation | |
| Jun 25, 2024 | Sandalakis | ½–½ | Grapsa | Round 4: Sandalakis, Nikolaos - Grapsa, Georgia | Sicilian Defense: Taimanov Variation, Szén Variation | |
| Jun 24, 2024 | Papasimakopoulos | 1–0 | Sandalakis | Round 3: Papasimakopoulos, Alexandros - Sandalakis, Nikolaos | Nimzo-Larsen Attack: Classical Variation | |
| Aug 15, 2022 | Sandalakis | * | Vlahos | National Greek Team Championship | ? | |
| Jul 27, 2022 | Kilic | 1–0 | Sandalakis | 31st Internation Chess Tournament | Ruy Lopez: Closed, Anti-Marshall | |
| Oct 25, 2021 | Sandalakis | * | Hryshchenko | FIDE World Amateur 2021 U2300 | ? | |
| Oct 24, 2021 | Ladopoulos | 1–0 | Sandalakis | FIDE World Amateur 2021 U2300 | Ruy Lopez: Morphy Defense, Mackenzie Variation | |
| Oct 23, 2021 | Abdilkhair | 0–1 | Sandalakis | FIDE World Amateur 2021 U2300 | Italian Game: Scotch Gambit, Anderssen Attack | |
| Oct 22, 2021 | Sandalakis | 1–0 | Al-Hajiri | FIDE World Amateur 2021 U2300 | Four Knights Game: Gunsberg Variation | |
| Oct 21, 2021 | Szente Varga | 0–1 | Sandalakis | FIDE World Amateur 2021 U2300 | Four Knights Game: Scotch Variation, Belgrade Gambit | |
| Oct 20, 2021 | Sandalakis | 0–1 | Renkowski | FIDE World Amateur 2021 U2300 | French Defense: Tarrasch Variation, Closed Variation, Main Line | |
| Oct 19, 2021 | Gohil | 0–1 | Sandalakis | FIDE World Amateur 2021 U2300 | Trompowsky Attack | |
| Oct 18, 2021 | Sandalakis | ½–½ | Carroll | FIDE World Amateur 2021 U2300 | Sicilian Defense: Modern Variations | |
| Oct 17, 2021 | EL Ghdamssi | 0–1 | Sandalakis | U2300 FIDE World Amateur Championship | Indian Defense | |
| Sep 10, 2021 | Sandalakis | 0–1 | Kofidis | Greek Team Championship | Petrov's Defense: Nimzowitsch Attack | |
| Sep 9, 2021 | Kymionis | 0–1 | Sandalakis | Greek Team Championship | Four Knights Game: Glek System | |
| Sep 8, 2021 | Sandalakis | ½–½ | Tzouganakis | Greek Team Championship | Pirc Defense: Austrian Attack, Dragon Formation | |
| Sep 8, 2021 | Sandalakis | ½–½ | Malikentzos | Greek Team Championship | Caro-Kann Defense: Classical Variation, Main Line | |
| Sep 7, 2021 | Vlahos | ½–½ | Sandalakis | Greek Team Championship | English Opening: King's English Variation, Four Knights Variation, Quiet Line | |
| — | Sandalakis | 0–1 | Papakonstantinou | National Greek Team Championship | Ruy Lopez: Morphy Defense | |