| Jan 5, 2026 | Fize | 0–1 | Rossberg | Runde 7: Fize, Aleksandrs - Rossberg, Jonathan | Rapport-Jobava System | |
| Jan 4, 2026 | Rossberg | ½–½ | Juergenpott | Runde 6: Rossberg, Jonathan - Juergenpott, Maximilian | Scandinavian Defense: Valencian Variation, Main Line | |
| Jan 4, 2026 | Braun | 0–1 | Rossberg | Runde 5: Braun, Alexander - Rossberg, Jonathan | Blackmar-Diemer Gambit Accepted: Bogoljubow Defense | |
| Jan 3, 2026 | Rossberg | 0–1 | Celik | Runde 4: Rossberg, Jonathan - Celik, Abdullah | Sicilian Defense: Najdorf Variation | |
| Jan 3, 2026 | Gehrke | 0–1 | Rossberg | Runde 3: Gehrke, Mathias - Rossberg, Jonathan | Zukertort Opening | |
| Jan 2, 2026 | Rossberg | ½–½ | Nguyen | Runde 2: Rossberg, Jonathan - Nguyen, Laurentius | Italian Game: Scotch Gambit, Anderssen Attack | |
| Jan 2, 2026 | Stotyn | 1–0 | Rossberg | Runde 1: Stotyn, Fabian - Rossberg, Jonathan | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | |
| Jan 5, 2025 | Rossberg | ½–½ | Weitekamp | Round 7: Rossberg, Jonathan - Weitekamp, Ole | Caro-Kann Defense: Endgame Offer | |
| Jan 4, 2025 | Rossberg | 1–0 | Axt | Round 5: Rossberg, Jonathan - Axt, Christian | Sicilian Defense: Taimanov Variation | |
| Jan 4, 2025 | Krneta | ½–½ | Rossberg | Round 6: Krneta, Slavko - Rossberg, Jonathan | Sicilian Defense: Old Sicilian | |
| Jan 3, 2025 | Rossberg | 0–1 | Drews | Round 3: Rossberg, Jonathan - Drews, Nicolas | Caro-Kann Defense: Advance Variation, Bronstein Variation | |
| Jan 3, 2025 | Ramme | 0–1 | Rossberg | Round 4: Ramme, Georg - Rossberg, Jonathan | Indian Defense: Spielmann-Indian | |
| Jan 2, 2025 | Rossberg | 1–0 | ter Stal | Round 1: Rossberg, Jonathan - ter Stal, Esther | Caro-Kann Defense: Advance Variation, Bronstein Variation | |
| Jan 2, 2025 | Frese | 0–1 | Rossberg | Round 2: Frese, Immo - Rossberg, Jonathan | King's Indian Defense: Fianchetto Variation, Debrecen Defense | |
| Jan 7, 2023 | Rossberg | 1–0 | Moseler | Lower Saxony Championship | A | Sicilian Defense: Najdorf Variation, English Attack | |
| Jan 7, 2023 | Moerz | 1–0 | Rossberg | Lower Saxony Championship | A | Sicilian Defense: French Variation | |
| Jan 5, 2023 | Rossberg | ½–½ | Renner | Lower Saxony Championship | A | Sicilian Defense: Kan Variation, Knight Variation | |
