| Feb 7, 2026 | Ahlberg | 1–0 | Koessler | Round 5: Ahlberg, Matthias - Koessler, Wolfgang | Sicilian Defense: Closed | |
| Nov 22, 2025 | Hoke | 1–0 | Koessler | Round 9: Hoke, Adrian - Koessler, Wolfgang | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Nov 22, 2025 | Koessler | 1–0 | Droesser | Round 8: Koessler, Wolfgang - Droesser, Paul Maria Georg | French Defense: Rubinstein Variation | |
| Nov 22, 2025 | Tschernatsch | 1–0 | Koessler | Round 7: Tschernatsch, Johannes - Koessler, Wolfgang | Sicilian Defense: Kan Variation, Modern Variation | |
| Nov 22, 2025 | Koessler | 1–0 | Wagner | Round 6: Koessler, Wolfgang - Wagner, Tobias | Sicilian Defense: Accelerated Dragon | |
| Nov 22, 2025 | Pueschel | 0–1 | Koessler | Round 5: Pueschel, Leonard - Koessler, Wolfgang | Zukertort Opening: Sicilian Invitation | |
| Nov 22, 2025 | Koessler | ½–½ | Baumann | Round 4: Koessler, Wolfgang - Baumann, Paul | Caro-Kann Defense: Main Line | |
| Nov 22, 2025 | Schlereth | 1–0 | Koessler | Round 3: Schlereth, Maximilian - Koessler, Wolfgang | Catalan Opening: Open Defense, Classical Line | |
| Nov 22, 2025 | Koessler | 1–0 | Brockmann | Round 2: Koessler, Wolfgang - Brockmann, Lea | Ruy Lopez: Berlin Defense | |
| Nov 22, 2025 | Poschik | 1–0 | Koessler | Round 1: Poschik, Julian - Koessler, Wolfgang | Sicilian Defense: French Variation | |
| Feb 4, 2023 | Koessler | 0–1 | Mitrovic | World Olympiad PwD 2023 | French Defense: Winawer Variation, Retreat Variation, Armenian Line | |
| Feb 3, 2023 | Arstanbekov | 0–1 | Koessler | World Olympiad PwD 2023 | Sicilian Defense: Kramnik Variation | |
| Feb 2, 2023 | Koessler | 1–0 | Nkhupi | World Olympiad PwD 2023 | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Feb 1, 2023 | Koessler | ½–½ | Mamarajabov | World Olympiad PwD 2023 | Sicilian Defense: Kan Variation, Knight Variation | |
| Jan 31, 2023 | Maklushov | 1–0 | Koessler | World Olympiad PwD 2023 | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jan 30, 2023 | Koessler | 0–1 | Molenda | World Olympiad PwD | Sicilian Defense: Moscow Variation, Main Line | |
