| Jul 20, 2025 | Gelle | 0–1 | Csonka | Hungarian Rapid Champioship | Queen's Pawn Game: London System | |
| Jul 20, 2025 | Gelle | 1–0 | Varga | Hungarian Rapid Champioship | Indian Defense | |
| Jul 19, 2025 | Gelle | 0–1 | Galyas | Hungarian Rapid Champioship | Queen's Pawn Game: London System, with e6 | |
| Jul 19, 2025 | Balog | 1–0 | Gelle | Hungarian Rapid Champioship | Slav Defense: Modern Line | |
| Jul 19, 2025 | Gelle | 1–0 | Papp | Hungarian Rapid Champioship | Indian Defense | |
| Jun 23, 2025 | Staudner | 1–0 | Gelle | 37th International Chess Tournament Open Pula 2025 | Caro-Kann Defense: Exchange Variation | |
| Jun 18, 2025 | Gelle | 0–1 | Noy | 37th International Chess Tournament Open Pula 2025 | Queen's Pawn Game: London System | |
| Jun 30, 2024 | Ghaith Saeed Alnuaimi | ½–½ | Gelle | Round 9: Ghaith Saeed Alnuaimi - Gelle, Istvan | Caro-Kann Defense: Classical Variation, Main Line | |
| Jun 29, 2024 | Gelle | 0–1 | Grapsa | Round 8: Gelle, Istvan - Grapsa, Georgia | Pseudo Queen's Indian Defense | |
| Jun 28, 2024 | Papasimakopoulos | 1–0 | Gelle | Round 7: Papasimakopoulos, Alexandros - Gelle, Istvan | English Opening: Caro-Kann Defensive System | |
| Jun 27, 2024 | Gelle | 1–0 | Al Maamari | Round 6: Gelle, Istvan - Al Maamari, Wafia Darwish | Queen's Pawn Game: London System | |
| Jun 26, 2024 | Budisavljevic | 1–0 | Gelle | Round 5: Budisavljevic, Luka - Gelle, Istvan | Caro-Kann Defense: Two Knights Attack | |
| Jun 25, 2024 | Witczak | 0–1 | Gelle | Round 4: Witczak, Borys - Gelle, Istvan | Slav Defense: Exchange Variation | |
| Jun 24, 2024 | Gelle | 1–0 | Perrakis | Round 3: Gelle, Istvan - Perrakis, Polychronis | Horwitz Defense | |
| Jun 22, 2024 | Nasuta | 1–0 | Gelle | Round 2: Nasuta, Grzegorz - Gelle, Istvan | Caro-Kann Defense: Advance Variation, Short Variation | |
| Jul 20, 2024 | Gelle | 0–1 | Zwardon | IX.Csaba Arpad Emlekvereny | Indian Defense: London System | |
| Jul 20, 2024 | Gelle | 0–1 | Banusz | IX.Csaba Arpad Emlekvereny | Indian Defense: London System | |
| Apr 23, 2023 | Szalay-Ocsak | 0–1 | Gelle | HUN Super League | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Apr 22, 2023 | Gelle | 0–1 | Lorand | HUN Super League | Indian Defense | |
| Jul 17, 2022 | Gelle | ½–½ | Lazarne Vajda | HUN rapid championship | Queen's Pawn Game: Accelerated London System | |
| Jul 15, 2022 | Gelle | 1–0 | Meszaros | HUN rapid championship | Indian Defense | |
| Jul 15, 2022 | Gelle | 1–0 | Tolnai | HUN rapid championship | Horwitz Defense | |
| Jul 15, 2022 | Papp | 1–0 | Gelle | HUN rapid championship | Réti Opening: Anglo-Slav Variation, Bogoljubow Variation | |
| Jun 23, 2022 | Gelle | 0–1 | Pastar | Pula Open | Indian Defense | |
| Jul 18, 2021 | Gelle | 1–0 | Bakos | Hungarian Rapid Championship | ? | |
| Jul 17, 2021 | Gelle | * | Palczert | Hungarian Rapid Championship | ? | |
| Jul 16, 2021 | Galyas | 1–0 | Gelle | Hungarian Rapid Championship | English Opening: Caro-Kann Defensive System | |
| Jul 16, 2021 | Horvath | 1–0 | Gelle | Hungarian Rapid Championship | Slav Defense: Chebanenko Variation | |
| — | Gelle | 1–0 | Ayats Llobera | Ronda 2: Gelle, Istvan - Ayats Llobera, Gerard | Queen's Pawn Game | |
| — | Gelle | 0–1 | Tan | Ronda 3: Gelle, Istvan - Tan, Jun Ying | Modern Defense: Geller's System | |
