| Nov 23, 2025 | Hoesel | 1–0 | Klein | Round 9: Hoesel, Lucas - Klein, Simon | Queen's Pawn Game | |
| Nov 23, 2025 | Klein | 0–1 | Stelte | Round 8: Klein, Simon - Stelte, Philip | Dutch Defense | |
| Nov 23, 2025 | Montag | 1–0 | Klein | Round 7: Montag, Jan - Klein, Simon | Old Indian Defense | |
| Nov 23, 2025 | Klein | 1–0 | Ferchel | Round 6: Klein, Simon - Ferchel, Leo | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| Nov 23, 2025 | Kayhan | 1–0 | Klein | Round 5: Kayhan, Melih - Klein, Simon | Pirc Defense | |
| Nov 23, 2025 | Klein | 0–1 | Zahed | Round 4: Klein, Simon - Zahed, Pezhman | Horwitz Defense | |
| Nov 23, 2025 | Trosin | 1–0 | Klein | Round 3: Trosin, Moritz - Klein, Simon | Philidor Defense: Lion Variation | |
| Nov 23, 2025 | Klein | 1–0 | Stoehr | Round 2: Klein, Simon - Stoehr, Leif | Indian Defense | |
| Nov 23, 2025 | Henning | 1–0 | Klein | Round 1: Henning, Marvin - Klein, Simon | Lion Defense: Bayonet Attack | |
| Nov 22, 2025 | Duong | 0–1 | Klein | Round 9: Duong, Michelle - Klein, Simon | Philidor Defense: Lion Variation | |
| Nov 22, 2025 | Klein | 0–1 | Mende | Round 8: Klein, Simon - Mende, Tamino | Indian Defense | |
| Nov 22, 2025 | Kayhan | 1–0 | Klein | Round 7: Kayhan, Melih - Klein, Simon | Philidor Defense: Lion Variation | |
| Nov 22, 2025 | Klein | 0–1 | Rottstock | Round 6: Klein, Simon - Rottstock, Henrike Georgina | Queen's Pawn Game: Accelerated London System | |
| Nov 22, 2025 | Lampe | 1–0 | Klein | Round 5: Lampe, Anna - Klein, Simon | Philidor Defense: Lion Variation | |
| Nov 22, 2025 | Klein | 0–1 | Zahed | Round 4: Klein, Simon - Zahed, Pezhman | Horwitz Defense | |
| Nov 22, 2025 | Ucar | 1–0 | Klein | Round 3: Ucar, Eren - Klein, Simon | English Opening | |
| Nov 22, 2025 | Klein | 1–0 | Tag | Round 2: Klein, Simon - Tag, Martha | Queen's Pawn Game: Accelerated London System | |
| Nov 22, 2025 | Hagenmeyer | 1–0 | Klein | Round 1: Hagenmeyer, Felix - Klein, Simon | Philidor Defense: Lion Variation, Lion's Claw, with Be2 and c6 | |
| Nov 30, 2024 | Klein | 1–0 | Boettcher | Round 2: Klein, Simon - Boettcher, Jona | Queen's Pawn Game | |
| Nov 30, 2024 | Klein | 0–1 | Osmanov | Round 4: Klein, Simon - Osmanov, Ilnur | Indian Defense | |
| Nov 30, 2024 | Klein | 0–1 | Ruebsam | Round 6: Klein, Simon - Ruebsam, Franziskus | Horwitz Defense | |
| Nov 30, 2024 | Klein | 1–0 | Rohwedder | Round 7: Klein, Simon - Rohwedder, Sebastian | Benoni Defense: Old Benoni | |
| Nov 30, 2024 | Natsidis | 1–0 | Klein | Round 1: Natsidis, Christoph - Klein, Simon | Lion Defense: Lion's Jaw | |
| Nov 30, 2024 | Peng | 1–0 | Klein | Round 3: Peng, Xiang-Tobias - Klein, Simon | Lion Defense: Anti-Philidor, Lion's Cave | |
| Nov 30, 2024 | Brockmann | 0–1 | Klein | Round 5: Brockmann, Sean - Klein, Simon | Pirc Defense | |
