| Oct 25, 2025 | Ulrich Schmidt | 0–1 | Lehmkuhl | Runde 7: Ulrich Schmidt - Lehmkuhl, Stefan | Queen's Pawn Game: Anti-Torre | |
| Oct 25, 2025 | Lehmkuhl | 1–0 | Warns | Runde 6: Lehmkuhl, Stefan - Warns, Harald | Queen's Gambit Declined: Exchange Variation | |
| Oct 25, 2025 | Nordhorn | ½–½ | Lehmkuhl | Runde 5: Nordhorn, Horst - Lehmkuhl, Stefan | Polish Opening: Baltic Defense | |
| Oct 24, 2025 | Lehmkuhl | ½–½ | Behrendt | Runde 4: Lehmkuhl, Stefan - Behrendt, Ingo | Nimzo-Indian Defense: Normal Variation | |
| Oct 24, 2025 | Rudolph | ½–½ | Lehmkuhl | Runde 3: Rudolph, Max - Lehmkuhl, Stefan | Zukertort Opening: Reversed Grünfeld | |
| Oct 23, 2025 | Lehmkuhl | 0–1 | Jungmann | Runde 2: Lehmkuhl, Stefan - Jungmann, Oleg | Trompowsky Attack | |
| Oct 23, 2025 | Schmorr | 0–1 | Lehmkuhl | Runde 1: Schmorr, Daniel - Lehmkuhl, Stefan | Alekhine Defense: Two Pawns Attack | |
| Jan 5, 2025 | Lehmkuhl | 0–1 | Loecken | Round 7: Lehmkuhl, Stefan - Loecken, Siegfried | Benoni Defense: King's Pawn Line | |
| Jan 4, 2025 | Lehmkuhl | ½–½ | Kiesel | Round 5: Lehmkuhl, Stefan - Kiesel, Lara | Trompowsky Attack: Edge Variation | |
| Jan 4, 2025 | Schulze | ½–½ | Lehmkuhl | Round 6: Schulze, Tim - Lehmkuhl, Stefan | Zukertort Opening | |
| Jan 3, 2025 | Lehmkuhl | ½–½ | Goertzen | Round 3: Lehmkuhl, Stefan - Goertzen, Simon | Nimzo-Indian Defense: Normal Variation, Classical Defense | |
| Jan 3, 2025 | Buecklers | ½–½ | Lehmkuhl | Round 4: Buecklers, Martin - Lehmkuhl, Stefan | Zukertort Opening: Pirc Invitation | |
| Jan 2, 2025 | Lehmkuhl | 0–1 | Kieselbach | Round 1: Lehmkuhl, Stefan - Kieselbach, Marvin | Nimzo-Indian Defense: Normal Variation | |
| Jan 2, 2025 | Aden | 1–0 | Lehmkuhl | Round 2: Aden, Meino - Lehmkuhl, Stefan | Queen's Gambit Accepted: Central Variation, Rubinstein Defense | |
| Jan 7, 2023 | Lehmkuhl | ½–½ | Gottschalk | Lower Saxony Championship | A | Trompowsky Attack: Edge Variation | |
| Jan 7, 2023 | Muecke | ½–½ | Lehmkuhl | Lower Saxony Championship | A | Zukertort Opening: Pirc Invitation | |
| Jan 5, 2023 | Burkhardt | ½–½ | Lehmkuhl | Lower Saxony Championship | A | Scandinavian Defense: Main Line | |
| — | Lehmkuhl | ½–½ | Pittelkow | Round 1: Lehmkuhl, Stefan - Pittelkow, Andreas, Dr. | Trompowsky Attack | |
| — | Lehmkuhl | ½–½ | Oblender | Round 4: Lehmkuhl, Stefan - Oblender, Rudi | Trompowsky Attack | |
| — | Lehmkuhl | ½–½ | Ohme | Round 6: Lehmkuhl, Stefan - Ohme, Leon | Queen's Gambit Declined: Modern Variation | |
| — | Castro Niemann | 1–0 | Lehmkuhl | Round 2: Castro Niemann, Quentin Jose - Lehmkuhl, Stefan | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| — | Zitzewitz | 1–0 | Lehmkuhl | Round 3: Zitzewitz, Roland - Lehmkuhl, Stefan | Queen's Gambit Accepted: Central Variation, Rubinstein Defense | |
| — | Denninger | 1–0 | Lehmkuhl | Round 5: Denninger, David - Lehmkuhl, Stefan | Queen's Pawn Game: Accelerated London System | |
| — | Kamps | ½–½ | Lehmkuhl | Round 7: Kamps, Manuel - Lehmkuhl, Stefan | Alekhine Defense: Four Pawns Attack, Main Line | |
