| Jul 10, 2025 | Koenig | 1–0 | Jahn | Round 4: Koenig, Dirk - Jahn, Peter | Caro-Kann Defense: Two Knights Attack | |
| Jul 9, 2025 | Jahn | 1–0 | Hencke | Round 3: Jahn, Peter - Hencke, Heiko | Zukertort Opening: Reversed Grünfeld | |
| Jul 8, 2025 | Schirmag | 0–1 | Jahn | Round 2: Schirmag, Wolfgang - Jahn, Peter | Zukertort Opening | |
| Jul 7, 2025 | Jahn | 0–1 | Richter | Round 1: Jahn, Peter - Richter, Juergen | Queen's Pawn Game: Modern Defense | |
| Jul 10, 2024 | Namyslo | 1–0 | Jahn | 9. offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jul 9, 2024 | Jahn | ½–½ | Heck | 9. offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Neo-Grünfeld Defense: Classical Variation, Original Defense | |
| Jul 8, 2024 | Jahn | 1–0 | Braeuner | 9. offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Indian Defense: Knights Variation | |
| Jul 7, 2024 | Sicker | 0–1 | Jahn | 9. offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Caro-Kann Defense: Tartakower Variation | |
| Jul 6, 2024 | Jahn | 1–0 | Wild | 9. offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| Apr 14, 2024 | Jahn | 0–1 | Loew | Round 9: Jahn, Peter - Loew, Gerald | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| Apr 13, 2024 | Marentini | 0–1 | Jahn | Round 8: Marentini, Marcel - Jahn, Peter | Zukertort Opening: Reversed Grünfeld | |
| Apr 11, 2024 | Jahn | ½–½ | Cordts | Round 6: Jahn, Peter - Cordts, Ingo | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| Apr 8, 2024 | Jahn | ½–½ | Heinbuch | Round 3: Jahn, Peter - Heinbuch, Detlef Ulrich | Benoni Defense: Old Benoni | |
