| Game | Result | Opening | Date |
|---|---|---|---|
| Behrens, Harald (2184) – Kolthoff, Siegmund (2068) | 1/2-1/2 | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | 2026-08-26 |
| Linke, Michael (1851) – Kolthoff, Siegmund (2068) | 0-1 | Sicilian Defense: Closed | 2026-08-25 |
| Kolthoff, Siegmund (2068) – Mondorf, Karl-Josef (1906) | 1-0 | English Opening: Symmetrical Variation, Anti-Benoni Variation | 2026-08-24 |
| Heck, Norbert (2231) – Kolthoff, Siegmund (2068) | 1-0 | Catalan Opening: Open Defense, Classical Line | 2026-08-23 |
| Kolthoff, Siegmund (2068) – Haertner, Helmut, Dr. (1917) | 1-0 | English Opening: Symmetrical Variation | 2026-08-22 |
| Hirstel, Serge (1907) – Kolthoff, Siegmund (2068) | 1/2-1/2 | King's Indian Attack: Sicilian Variation | 2026-08-21 |
| Kolthoff, Siegmund (2068) – Haffner, Ernst Georg, Prof. Dr. (1951) | 1/2-1/2 | Queen's Pawn Game: Chigorin Variation | 2026-08-20 |
| Hansult, Manfred (1855) – Kolthoff, Siegmund (2068) | 0-1 | Indian Defense: Spielmann-Indian | 2026-08-19 |
| Kolthoff, Siegmund (2068) – Warnk, Torsten (1845) | 1/2-1/2 | Slav Defense: Modern Line | 2026-08-18 |
| Domroese, Michael (1842) – Kolthoff, Siegmund (2065) | 1/2-1/2 | Sicilian Defense: Grand Prix Attack | 2026-07-10 |
| Kolthoff, Siegmund (2065) – Hess, Juergen (1939) | 1/2-1/2 | Catalan Opening: Open Defense, Classical Line | 2026-07-09 |
| Okrajek, Alexander (2199) – Kolthoff, Siegmund (2065) | 1/2-1/2 | English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | 2026-07-08 |
| Kolthoff, Siegmund (2065) – Reimann, Reinhold (1892) | 1-0 | Zukertort Opening: Queen's Gambit Invitation | 2026-07-07 |
| Boldt, Heinrich (1825) – Kolthoff, Siegmund (2065) | 0-1 | English Opening: Symmetrical Variation, Fianchetto Variation | 2026-07-06 |
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