| May 17, 2026 | Bredereck | ½–½ | Steiner | Runde 7: Bredereck, David - Steiner, Peter Markus | English Opening: Anglo-Lithuanian Variation | |
| May 16, 2026 | Steiner | 0–1 | Wander | Runde 6: Steiner, Peter Markus - Wander, Nikita | Polish Opening | |
| May 16, 2026 | Toman | 1–0 | Steiner | Runde 5: Toman, Darius - Steiner, Peter Markus | French Defense: Exchange Variation | |
| May 15, 2026 | Steiner | 0–1 | Kaiser | Runde 4: Steiner, Peter Markus - Kaiser, Sebastian | Polish Opening: Outflank Variation | |
| May 15, 2026 | Bewersdorff | 0–1 | Steiner | Runde 3: Bewersdorff, Christian - Steiner, Peter Markus | French Defense: Knight Variation | |
| May 14, 2026 | Steiner | 1–0 | Schumann | Runde 2: Steiner, Peter Markus - Schumann, Linus | Polish Opening, with d5 | |
| May 14, 2026 | Quiring | 1–0 | Steiner | Round 1: Quiring, Nikolai - Steiner, Peter Markus | Polish Defense | |
| Oct 30, 2025 | Steiner | 0–1 | Hasselgruber | Round 1: Steiner, Peter Markus - Hasselgruber, Robert Ferenc | Polish Opening | |
| Oct 5, 2025 | Steiner | 0–1 | Engelberg | Round 5: Steiner, Peter Markus - Engelberg, Sebastian | Polish Opening | |
| Oct 4, 2025 | Pitzschel | 1–0 | Steiner | Round 4: Pitzschel, Joerg - Steiner, Peter Markus | English Opening: Anglo-Dutch Defense | |
| Oct 4, 2025 | Steiner | 1–0 | Lichtfuss-Kolbinger | Round 3: Steiner, Peter Markus - Lichtfuss-Kolbinger, Jana | Polish Opening: Baltic Defense | |
| Oct 3, 2025 | Oita-Dragota | 1–0 | Steiner | Round 2: Oita-Dragota, Alexandru-Teodor - Steiner, Peter Markus | French Defense: Horwitz Attack, Papa-Ticulat Gambit | |
| Oct 3, 2025 | Steiner | ½–½ | Moeller | Round 1: Steiner, Peter Markus - Moeller, Patrick | Polish Opening | |
| May 12, 2024 | Fabig | 1–0 | Steiner | 3. Itzehoer Schach Open | French Defense: Tarrasch Variation, Closed Variation | |
| May 11, 2024 | Yarina | ½–½ | Steiner | 3. Itzehoer Schach Open | St. George Defense: Polish Variation | |
| May 11, 2024 | Steiner | 1–0 | Marmuta | 3. Itzehoer Schach Open | Polish Opening | |
| May 10, 2024 | Moysich | 1–0 | Steiner | 3. Itzehoer Schach Open | English Opening: Anglo-Dutch Defense | |
| May 10, 2024 | Steiner | 1–0 | Michael Koop | 3. Itzehoer Schach Open | Polish Opening | |
| May 9, 2024 | Goettsche | 1–0 | Steiner | 3. Itzehoer Schach Open | Slav Defense: Geller Gambit | |
| May 9, 2024 | Steiner | 1–0 | Greiner | 3. Itzehoer Schach Open (37-58) | Polish Opening: Symmetrical Variation | |
