56 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Kolthoff, Siegmund | Nagel, Bernhard | 1/2-1/2 | D02 | Round 5: Kolthoff, Siegmund - Nagel, Bernhard | 2026-09-18 |
| Kolthoff, Siegmund | Krause, Ullrich | 1/2-1/2 | E11 | Round 1: Kolthoff, Siegmund - Krause, Ullrich | 2026-09-16 |
| Kolthoff, Siegmund | Pfrommer, Christoph | 1/2-1/2 | A14 | Round 3: Kolthoff, Siegmund - Pfrommer, Christoph | 2026-09-16 |
| Kolthoff, Siegmund | Mueller, Ralf | 1/2-1/2 | C47 | Round 7: Kolthoff, Siegmund - Mueller, Ralf | 2026-09-11 |
| Kolthoff, Siegmund | Mondorf, Karl-Josef | 1-0 | A31 | Round 7: Kolthoff, Siegmund - Mondorf, Karl-Josef | 2026-08-24 |
| Kolthoff, Siegmund | Haertner, Helmut, Dr. | 1-0 | A30 | Round 5: Kolthoff, Siegmund - Haertner, Helmut, Dr. | 2026-08-22 |
| Kolthoff, Siegmund | Haffner, Ernst Georg, Prof. Dr. | 1/2-1/2 | D02 | Round 3: Kolthoff, Siegmund - Haffner, Ernst Georg, Prof. Dr. | 2026-08-20 |
| Kolthoff, Siegmund | Warnk, Torsten | 1/2-1/2 | D11 | Round 1: Kolthoff, Siegmund - Warnk, Torsten | 2026-08-18 |
| Kolthoff, Siegmund | Kopp, Peter, Dr. | 1-0 | C41 | Round 6: Kolthoff, Siegmund - Kopp, Peter, Dr. | 2026-07-11 |
| Kolthoff, Siegmund | Hess, Juergen | 1/2-1/2 | E05 | Round 4: Kolthoff, Siegmund - Hess, Juergen | 2026-07-09 |
| Kolthoff, Siegmund | Reimann, Reinhold | 1-0 | A04 | Round 2: Kolthoff, Siegmund - Reimann, Reinhold | 2026-07-07 |
| Kolthoff, Siegmund | Barten, Ralf | 1-0 | D11 | Round 6: Kolthoff, Siegmund - Barten, Ralf | 2025-07-12 |
| Kolthoff, Siegmund | Broeder, Hans-Gert | 1-0 | D12 | Round 4: Kolthoff, Siegmund - Broeder, Hans-Gert | 2025-07-10 |
| Kolthoff, Siegmund | Cordes, Lothar | 0-1 | A38 | Round 2: Kolthoff, Siegmund - Cordes, Lothar | 2025-07-08 |
| Kolthoff, Siegmund | Belke, Frank, Dr. | 1/2-1/2 | A48 | Round 4: Kolthoff, Siegmund - Belke, Frank, Dr. | 2025-04-01 |
| Kolthoff, Siegmund | Nikolov, Jordan | 1-0 | A21 | Round 3: Kolthoff, Siegmund - Nikolov, Jordan | 2025-03-31 |
| Kolthoff, Siegmund | Samisch, Romuald | 1-0 | D31 | Round 1: Kolthoff, Siegmund - Samisch, Romuald | 2025-03-29 |
| Kolthoff, Siegmund | Cordes, Lothar | 1-0 | E00 | Round 7: Kolthoff, Siegmund - Cordes, Lothar | 2024-07-07 |
| Kolthoff, Siegmund | Poetke, Dan-Peter | 1/2-1/2 | A16 | Round 5: Kolthoff, Siegmund - Poetke, Dan-Peter | 2024-07-05 |
| Kolthoff, Siegmund | Colin Costello | 1-0 | E11 | Round 3: Kolthoff, Siegmund - Colin Costello | 2024-07-03 |
| Kolthoff, Siegmund | Schwarz, Hans | 1-0 | A04 | Round 1: Kolthoff, Siegmund - Schwarz, Hans | 2024-07-01 |
| Kolthoff, Siegmund | Waagener, Ulrich | * | A04 | Round 1: Kolthoff, Siegmund - Waagener, Ulrich | 2024-07-01 |
| Kolthoff, Siegmund | Wacker, Peter | 1/2-1/2 | B13 | 20. RLP-Senioren-Open | 2023-09-10 |
| Kolthoff, Siegmund | Hesse, Rutger | 1-0 | C92 | 20. RLP-Senioren-Open | 2023-09-08 |
| Kolthoff, Siegmund | Wegemund, Hubert | 1/2-1/2 | D34 | 20. RLP-Senioren-Open | 2023-09-06 |
| Siegmund Kolthoff | Alexander Hilverda | 0-1 | B48 | Round 6: Siegmund Kolthoff - Alexander Hilverda | 2023-04-02 |
| Siegmund Kolthoff | Maurice Gulatz | 1-0 | D12 | Round 4: Siegmund Kolthoff - Maurice Gulatz | 2023-04-02 |