| Apr 3, 2026 | Muendoerfer | 0–1 | Klages | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | King's Indian Attack: Wahls Defense | |
| Apr 2, 2026 | Klages | 0–1 | Schoene | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Apr 1, 2026 | Fischer | ½–½ | Klages | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | King's Indian Defense: Normal Variation, Rare Defenses | |
| Apr 1, 2026 | Klages | 1–0 | Stoffers | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | Ruy Lopez: Morphy Defense, Classical Defense Deferred | |
| Mar 31, 2026 | Schmidt | ½–½ | Klages | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | Indian Defense: Anti-Grünfeld, Basman-Williams Attack | |
| Mar 30, 2026 | Ebel | 0–1 | Klages | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Mar 30, 2026 | Klages | 0–1 | Haustein | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | Ruy Lopez: Schliemann Defense, Exchange Variation | |
| Mar 29, 2026 | Placke | 0–1 | Klages | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | King's Indian Defense: Exchange Variation | |
| Mar 28, 2026 | Klages | 0–1 | Holtwessels | Landesjugendeinzelmeisterschaft in Niedersachsen U16 | Sicilian Defense: Dragon Variation, Classical Variation | |
| Jan 5, 2026 | ter Stal | 1–0 | Klages | Runde 7: ter Stal, Esther - Klages, Jonas | King's Indian Defense: Orthodox Variation, Classical System, Neo-Classical Line | |
| Jan 4, 2026 | Klages | 0–1 | Nordhorn | Runde 6: Klages, Jonas - Nordhorn, Horst | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Jan 4, 2026 | Hengst | ½–½ | Klages | Runde 5: Hengst, Ruediger - Klages, Jonas | Sicilian Defense: Grand Prix Attack | |
| Jan 3, 2026 | Klages | 1–0 | Rueckinger | Runde 4: Klages, Jonas - Rueckinger, Leonidas | Caro-Kann Defense: Advance Variation | |
| Jan 3, 2026 | Neumann | 1–0 | Klages | Runde 3: Neumann, Jacob - Klages, Jonas | Indian Defense: Accelerated London System | |
| Jan 2, 2026 | Klages | * | Cordes | Runde 2: Klages, Jonas - Cordes, Michael | ? | |
| Jan 2, 2026 | Nolte | 1–0 | Klages | Runde 1: Nolte, Alexander Nicolai - Klages, Jonas | King's Indian Defense: Orthodox Variation, Classical System, Neo-Classical Line | |
| Nov 1, 2025 | Klages | 1–0 | Caspari | Runde 7: Klages, Jonas - Caspari, Christian-Tim | English Defense | |
| Nov 1, 2025 | Wartenberg | 1–0 | Klages | Runde 6: Wartenberg, Julian - Klages, Jonas | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Breyer Variation | |
| Nov 1, 2025 | Klages | 0–1 | Gulamov | Runde 5: Klages, Jonas - Gulamov, Elmir | French Defense: Advance Variation, Main Line | |
| Oct 30, 2025 | Klages | 1–0 | Meyer | Runde 2: Klages, Jonas - Meyer, Loenne | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Oct 30, 2025 | Suberski | 0–1 | Klages | Runde 1: Suberski, Lukas - Klages, Jonas | Sicilian Defense: Accelerated Dragon, Modern Variation | |
| Oct 14, 2025 | Fels | 1–0 | Klages | Runde 4: Fels, Mattis - Klages, Jonas | Rapport-Jobava System | |
| Oct 14, 2025 | Klages | 1–0 | Ebert | Runde 3: Klages, Jonas - Ebert, Wolf | Sicilian Defense | |
| Apr 18, 2025 | Klages | 1–0 | Rinke | Runde 9: Klages, Jonas - Rinke, Alexander | Caro-Kann Defense: Two Knights Attack | |
| Apr 17, 2025 | Krueger | 1–0 | Klages | Runde 8: Krueger, Moritz - Klages, Jonas | King's Indian Defense: Fianchetto Variation, Debrecen Defense | |
| Apr 16, 2025 | Klages | ½–½ | Thomas Wozniak | Runde 7: Klages, Jonas - Thomas Wozniak | Sicilian Defense: Moscow Variation, Main Line | |
| Apr 15, 2025 | Klages | 1–0 | Haverlandt | Runde 5: Klages, Jonas - Haverlandt, Jannes | Caro-Kann Defense: Two Knights Attack | |
| Apr 14, 2025 | Klages | 1–0 | Baklan | Runde 4: Klages, Jonas - Baklan, Kira | French Defense: Schlechter Variation | |
| Apr 13, 2025 | Czubek | 0–1 | Klages | Runde 3: Czubek, Luca Sebastian - Klages, Jonas | King's Indian Defense: Petrosian Variation, Stein Defense | |
| Apr 13, 2025 | Klages | 1–0 | Vygodner | Runde 2: Klages, Jonas - Vygodner, Mark | Ruy Lopez: Berlin Defense, Beverwijk Variation | |
| Apr 12, 2025 | Petz | 1–0 | Klages | Runde 1: Petz, Hagen - Klages, Jonas | French Defense: Winawer Variation | |
| Apr 11, 2025 | Bundan | 1–0 | Klages | Runde 6: Bundan, Edward - Klages, Jonas | French Defense: Tarrasch Variation, Open System | |
| Jan 4, 2025 | Klages | 0–1 | Schulze | Round 5: Klages, Jonas - Schulze, Tim | Sicilian Defense: Nimzowitsch Variation, Closed Variation | |
| Jan 4, 2025 | Bisa | 1–0 | Klages | Round 6: Bisa, Gani - Klages, Jonas | King's Indian Defense: Four Pawns Attack | |
| Jan 3, 2025 | Klages | 0–1 | Stoy | Round 3: Klages, Jonas - Stoy, Ulf | Modern Defense: Standard Defense | |
| Jan 3, 2025 | Goertzen | 1–0 | Klages | Round 4: Goertzen, Simon - Klages, Jonas | French Defense: Advance Variation, Euwe Variation | |
| Jan 2, 2025 | Klages | ½–½ | Boehnke | Round 1: Klages, Jonas - Boehnke, Marc | Sicilian Defense: Najdorf Variation | |
| Jan 2, 2025 | Moeller | 1–0 | Klages | Round 2: Moeller, Jonas - Klages, Jonas | French Defense: Advance Variation, Euwe Variation | |
| May 25, 2024 | Klages | 1–0 | John | ODJM B 2024 | Sicilian Defense: Prins Variation | |
| May 24, 2024 | Bock | 0–1 | Klages | ODJM B 2024 | French Defense: Exchange Variation | |
| May 23, 2024 | Klages | 1–0 | Reger | ODJM B 2024 | Sicilian Defense: Kan Variation, Modern Variation | |
| May 22, 2024 | Klages | * | Neumeier | ODJM B 2024 | ? | |
| May 22, 2024 | He | ½–½ | Klages | ODJM B 2024 | French Defense: Exchange Variation | |
| May 21, 2024 | Mahr | ½–½ | Klages | ODJM B 2024 | French Defense: Exchange Variation | |
| May 20, 2024 | Klages | 1–0 | Barthelmes | ODJM B 2024 | Ruy Lopez: Berlin Defense | |
| May 19, 2024 | Klages | 0–1 | Grunert | ODJM B 2024 | French Defense: Tarrasch Variation, Open System | |
| May 19, 2024 | Pflug | ½–½ | Klages | ODJM B 2024 | French Defense: Advance Variation, Main Line | |
| Jan 7, 2023 | Klages | 0–1 | Rauschel | Lower Saxony Championship | C | Four Knights Game: Spanish Variation, Double Spanish | |
| Jan 7, 2023 | Nechytailo | 1–0 | Klages | Lower Saxony Championship | C | Italian Game: Giuoco Pianissimo, Normal | |
| Jan 5, 2023 | Klages | 0–1 | Wegmann | Lower Saxony Championship | C | Sicilian Defense: French Variation | |