| Oct 18, 2025 | Gneiss | 0–1 | Pernerstorfer | NÖ-Seniorenmeisterschaft 2025 | Sicilian Defense: Kalashnikov Variation | |
| Oct 18, 2025 | Wiedner | 1–0 | Gneiss | NÖ-Seniorenmeisterschaft 2025 | Queen's Gambit Declined: Vienna Variation | |
| Oct 17, 2025 | Hager | ½–½ | Gneiss | NÖ-Seniorenmeisterschaft 2025 | ? | |
| Oct 15, 2025 | Semeck | 0–1 | Gneiss | NÖ-Seniorenmeisterschaft 2025 | Sicilian Defense: Hyperaccelerated Dragon | |
| Oct 15, 2025 | Gneiss | 1–0 | Steinberg | NÖ-Seniorenmeisterschaft 2025 | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jun 20, 2025 | Ataiants | 1–0 | Gneiss | Round 9: Ataiants, Igor - Gneiss, Karl | Sicilian Defense: Smith-Morra Gambit | |
| Jun 20, 2025 | Gneiss | ½–½ | Benedikt | Round 8: Gneiss, Karl - Benedikt, Noah | English Opening: King's English Variation, Two Knights Variation, Keres Variation | |
| Jun 20, 2025 | Goeschl | 0–1 | Gneiss | Round 7: Goeschl, Ortrun - Gneiss, Karl | Sicilian Defense: Closed | |
| Jun 20, 2025 | Gneiss | ½–½ | Budjav | Round 6: Gneiss, Karl - Budjav, Enkhjargal | English Opening: King's English Variation | |
| Jun 20, 2025 | Stadlinger | ½–½ | Gneiss | Round 5: Stadlinger, Lea - Gneiss, Karl | Horwitz Defense | |
| Jun 19, 2025 | Gneiss | 0–1 | Borrmann | Round 4: Gneiss, Karl - Borrmann, Laurenz | English Opening: King's English Variation, Two Knights Variation, Keres Variation | |
| Jun 19, 2025 | Spierings | 0–1 | Gneiss | Round 3: Spierings, Benjamin - Gneiss, Karl | Sicilian Defense: Smith-Morra Gambit | |
| Jun 19, 2025 | Gneiss | 0–1 | Baumegger | Round 2: Gneiss, Karl - Baumegger, Siegfried | English Opening: King's English Variation, Taimanov Variation | |
| Jun 19, 2025 | Moscovscaia | 0–1 | Gneiss | Round 1: Moscovscaia, Polina - Gneiss, Karl | Sicilian Defense: Hyperaccelerated Dragon | |
| May 31, 2024 | Gneiss | 1–0 | Stadlinger | Round 9: Gneiss, Karl - Stadlinger, Lea | English Opening: King's English Variation | |
| May 31, 2024 | Keferboeck | ½–½ | Gneiss | Round 8: Keferboeck, Jewgeni - Gneiss, Karl | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Breyer Variation | |
| May 31, 2024 | Gneiss | 1–0 | Horvath | Round 7: Gneiss, Karl - Horvath, Reka | English Opening: Symmetrical Variation, Mecking Variation | |
| May 31, 2024 | Spierings | 0–1 | Gneiss | Round 6: Spierings, Benjamin - Gneiss, Karl | Sicilian Defense: Smith-Morra Gambit | |
| May 30, 2024 | Gneiss | 0–1 | Tumanyan | Round 5: Gneiss, Karl - Tumanyan, Gor | Caro-Kann Defense: Accelerated Panov Attack | |
| May 30, 2024 | Lerch | 1–0 | Gneiss | Round 4: Lerch, Johannes - Gneiss, Karl | Sicilian Defense: Closed | |
| May 30, 2024 | Gneiss | 1–0 | Erlacher | Round 3: Gneiss, Karl - Erlacher, Herbert | Dutch Defense: Normal Variation | |
| May 30, 2024 | Kilgus | 1–0 | Gneiss | Round 2: Kilgus, Georg - Gneiss, Karl | Queen's Pawn Game: London System | |
| May 30, 2024 | Gneiss | 1–0 | Hyassat | Round 1: Gneiss, Karl - Hyassat, Milana | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
