| Nov 1, 2025 | Becher | ½–½ | Tietjen | Runde 7: Becher, Georg, Dr. - Tietjen, Joshua | Queen's Pawn Game: Symmetrical Variation | |
| Nov 1, 2025 | Tietjen | ½–½ | Jonnek | Runde 6: Tietjen, Joshua - Jonnek, Thomas | Caro-Kann Defense: Exchange Variation | |
| Nov 1, 2025 | Tietjen | 1–0 | Roth | Runde 5: Tietjen, Joshua - Roth, Thorsten | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Oct 31, 2025 | Nolte | 0–1 | Tietjen | Runde 4: Nolte, Alexander Nicolai - Tietjen, Joshua | Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line | |
| Oct 31, 2025 | Tietjen | ½–½ | Lau | Runde 3: Tietjen, Joshua - Lau, Udo | Sicilian Defense: French Variation, Westerinen Attack | |
| Oct 30, 2025 | Mueller-Ludwig | 1–0 | Tietjen | Runde 2: Mueller-Ludwig, Kristin - Tietjen, Joshua | Ruy Lopez: Morphy Defense | |
| Oct 30, 2025 | Tietjen | 0–1 | Giel | Runde 1: Tietjen, Joshua - Giel, Olaf | Sicilian Defense: Moscow Variation | |
| Jul 19, 2025 | Tietjen | 1–0 | Zimmer | Round 5: Tietjen, Joshua - Zimmer, Lennard | King's Indian Attack | |
| Jul 18, 2025 | Gesell | ½–½ | Tietjen | Round 4: Gesell, Fabian - Tietjen, Joshua | Sicilian Defense: Modern Variations | |
| Jul 18, 2025 | Tietjen | 1–0 | Sauer | Round 3: Tietjen, Joshua - Sauer, Ben | Nimzo-Indian Defense: St. Petersburg Variation | |
| Jul 17, 2025 | Neldner | ½–½ | Tietjen | Round 2: Neldner, Moritz - Tietjen, Joshua | Catalan Opening: Open Defense, Classical Line | |
| Jul 17, 2025 | Tietjen | 1–0 | Schaetzle | Round 1: Tietjen, Joshua - Schaetzle, Thomas | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations | |
| Jun 9, 2024 | Tietjen | ½–½ | Hoepfner | Round 5: Tietjen, Joshua - Hoepfner, Oliver, Dr. | Scandinavian Defense: Mieses-Kotroc Variation | |
| Nov 3, 2024 | Tietjen | 0–1 | Neumann | Round 7: Tietjen, Joshua - Neumann, Hannes | Sicilian Defense: Four Knights Variation | |
| Nov 2, 2024 | Tietjen | ½–½ | Kuhlins | Round 5: Tietjen, Joshua - Kuhlins, Niklas | Zukertort Opening: Nimzo-Larsen Variation | |
| Nov 2, 2024 | Witte | 0–1 | Tietjen | Round 6: Witte, Volker, Dr. - Tietjen, Joshua | King's Indian Defense: Sämisch Variation, Normal Defense | |
| Nov 1, 2024 | Tietjen | 1–0 | Kulgemeyer | Round 3: Tietjen, Joshua - Kulgemeyer, Justus | Sicilian Defense: Alapin Variation | |
| Nov 1, 2024 | Wiege | ½–½ | Tietjen | Round 4: Wiege, Matthias - Tietjen, Joshua | King's Indian Defense: Orthodox Variation | |
| Oct 31, 2024 | Tietjen | 0–1 | Kandora | Round 1: Tietjen, Joshua - Kandora, Max | Four Knights Game: Glek System | |
| Oct 31, 2024 | Krause | 0–1 | Tietjen | Round 2: Krause, Volker - Tietjen, Joshua | Queen's Pawn Game: Modern Defense | |
| — | Tietjen | 1–0 | Bergner | Round 2: Tietjen, Joshua - Bergner, Matthias | Ruy Lopez: Morphy Defense, Caro Variation | |
| — | Tietjen | ½–½ | Ringeltaube | Round 4: Tietjen, Joshua - Ringeltaube, Denny | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| — | Tietjen | 1–0 | Hengst | Round 6: Tietjen, Joshua - Hengst, Ruediger | English Opening: Symmetrical Variation, Mecking Variation | |
| — | Martin | 1–0 | Tietjen | Round 1: Martin, Dennis - Tietjen, Joshua | King's Indian Defense: Normal Variation, Deferred Fianchetto | |
| — | Toenniges | 1–0 | Tietjen | Round 3: Toenniges, Thomas - Tietjen, Joshua | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| — | Kunz | ½–½ | Tietjen | Round 5: Kunz, Thorsten - Tietjen, Joshua | Indian Defense: Przepiorka Variation | |
| — | Alsleben | ½–½ | Tietjen | Round 7: Alsleben, Moritz - Tietjen, Joshua | Bogo-Indian Defense: Retreat Variation | |
