| 16 ago 2026 | Khamidov, Abdulla 2123 | Gersemann, Karl 2103 | 0-1 | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | 22. Lichtenberger Sommer 2026 | 43 | Ver |
| 15 ago 2026 | Gersemann, Karl 2103 | Udelnov, Valentin 2159 | 1-0 | C82 Apertura Española (Ruy López): Open, St. Petersburg Variation | 22. Lichtenberger Sommer 2026 | 38 | Ver |
| 14 ago 2026 | Gersemann, Karl 2103 | Schmidek, Emil 2429 | ½-½ | B11 Defensa Caro-Kann: Two Knights Attack, Mindeno Variation | 22. Lichtenberger Sommer 2026 | 102 | Ver |
| 13 ago 2026 | Hesse, Henrik 2326 | Gersemann, Karl 2103 | 0-1 | D02 Apertura de Peón de Dama: Symmetrical Variation, Pseudo-Catalan | 22. Lichtenberger Sommer 2026 | 90 | Ver |
| 30 may 2026 | Gersemann, Karl 2075 | Sheng, Ming 2156 | ½-½ | A15 Apertura Inglesa: Anglo-Indian Defense, King's Knight Variation | DEM U14 2026 | 32 | Ver |
| 26 may 2026 | Shevchenko, Igor 2138 | Gersemann, Karl 2075 | 1-0 | E49 Defensa Nimzoindia: Normal Variation, Botvinnik System | DEM U14 2026 | 38 | Ver |
| 24 may 2026 | Peglau, Paul David 2137 | Gersemann, Karl 2075 | 0-1 | D47 Defensa Semieslava: Meran Variation, Lundin Variation | DEM U14 2026 | 34 | Ver |
| 15 may 2026 | Gersemann, Karl 2075 | Andersen, Jonathan 2037 | 0-1 | B32 Defensa Siciliana: Kalashnikov Variation | DEM U14 2026 | 41 | Ver |
| 27 oct 2025 | Ilko-Toth, Andras 2200 | Gersemann, Karl 2001 | ½-½ | E05 Apertura Catalana: Open Defense, Classical Line | European Youth Chess Championship 2025 | U12 | 66 | Ver |
| 4 oct 2025 | Haug, Mara 2108 | Gersemann, Karl 2001 | ½-½ | B96 Defensa Siciliana: Najdorf Variation, Polugaevsky Variation, Simagin Line | Deutsche Ländermeisterschaft 2025 | 25 | Ver |