| Jun 16, 2026 | Tsamtsouris | 1–0 | Sideris | Round 3: Tsamtsouris, Efthymios - Sideris, Theodoros | King's Indian Defense: Makogonov Variation | |
| Jan 5, 2026 | Asvestas | 1–0 | Sideris | Round 5: Asvestas, Emmanouil - Sideris, Theodoros | Sicilian Defense: Snyder Variation | |
| Jan 4, 2026 | Sideris | ½–½ | Antoniadis | Round 4: Sideris, Theodoros - Antoniadis, Artiom | Sicilian Defense: Old Sicilian | |
| Sep 4, 2025 | Sideris | 0–1 | Vassis | Round 4: Sideris, Theodoros - Vassis, Michail | French Defense: Advance Variation, Euwe Variation | |
| Jun 21, 2024 | Chompas | 0–1 | Sideris | Round 7: Chompas, Vasileios - Sideris, Theodoros | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Jun 19, 2024 | Finokaliotis | 1–0 | Sideris | Round 5: Finokaliotis, Georgios - Sideris, Theodoros | English Opening: King's English Variation, Closed System | |
| Jun 16, 2024 | Sideris | 0–1 | Kapnisis | Round 2: Sideris, Theodoros - Kapnisis, Spyridon | Nimzowitsch Defense: Scandinavian Variation, Advance Variation | |
| Sep 17, 2023 | Sideris | 0–1 | Alexakis | 13th Papanastasio Open 2023 | Sicilian Defense: Old Sicilian | |
| Sep 16, 2023 | Kotsifis | 0–1 | Sideris | 13th Papanastasio Open 2023 | English Opening: King's English Variation, Taimanov Variation | |
| Sep 15, 2023 | Nikolaou | * | Sideris | 13th Papanastasio Open 2023 | Queen's Indian Defense: Fianchetto Variation, Rubinstein Variation | |
| Sep 14, 2023 | Sideris | 1–0 | Gavriil | 13th Papanastasio Open 2023 | Italian Game: Scotch Gambit, Max Lange Attack | |
| Jul 24, 2022 | Petrakis | 1–0 | Sideris | 15th Paleochora Open | ? | |
| Jul 23, 2022 | Sideris | * | Perrusset | 15th Paleochora Open | ? | |
| Jul 22, 2022 | Sideris | * | Oikonomopoulos | 15th Paleochora Open | ? | |
| Jul 20, 2022 | Pelantakis | * | Sideris | 15th Paleochora Open | ? | |
| Jul 19, 2022 | Sideris | ½–½ | Karakatsanis | 15th Paleochora Open | ? | |
| Jul 17, 2022 | Schmit | 1–0 | Sideris | 15th Paleochora Open | ? | |
| Jul 29, 2021 | Sideris | * | Pham | 14th Paleochora International Tournament | ? | |
| Jul 27, 2021 | Sarafis | * | Sideris | 13th International Tournament of Paleochora | ? | |
| Jul 26, 2021 | Papadopoulos | * | Sideris | 14th Paleochora International Tournament | ? | |
| Jul 26, 2021 | Papadopoulos | * | Sideris | 13th International Tournament of Paleochora | ? | |
| Jul 24, 2021 | Sideris | * | Theodoroglakis | 13th International Tournament of Paleochora | ? | |
| Jul 24, 2021 | Alexandri | 1–0 | Sideris | 14th Paleochora International Chess Tournament 2021 | ? | |
