| Oct 29, 2023 | Ruben Gideon Koellner | ½–½ | Martin Petrov | Round 9: Ruben Gideon Koellner - Martin Petrov | Trompowsky Attack | |
| Oct 28, 2023 | Szymon Gumularz | 1–0 | Ruben Gideon Koellner | Round 8: Szymon Gumularz - Ruben Gideon Koellner | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Oct 27, 2023 | Ruben Gideon Koellner | 1–0 | Paulius Pultinevicius | Round 7: Ruben Gideon Koellner - Paulius Pultinevicius | Pseudo Queen's Indian Defense | |
| Oct 26, 2023 | Bennet Hagner | ½–½ | Ruben Gideon Koellner | Round 6: Bennet Hagner - Ruben Gideon Koellner | Philidor Defense: Lion Variation | |
| Oct 26, 2023 | Ruben Gideon Koellner | 1–0 | Pijus Stremavicius | Round 5: Ruben Gideon Koellner - Pijus Stremavicius | Queen's Pawn Game: Zukertort Variation | |
| Oct 25, 2023 | Johannes Tschernatsch | 0–1 | Ruben Gideon Koellner | Round 4: Johannes Tschernatsch - Ruben Gideon Koellner | Italian Game: Classical Variation, Greco Gambit | |
| Oct 24, 2023 | Ruben Gideon Koellner | ½–½ | Mikhail Tobak | Round 3: Ruben Gideon Koellner - Mikhail Tobak | Sicilian Defense: Hyperaccelerated Pterodactyl | |
| Oct 24, 2023 | Keyvan Farokhi | 0–1 | Ruben Gideon Koellner | Round 2: Keyvan Farokhi - Ruben Gideon Koellner | Philidor Defense: Lion Variation, Shirov Gambit | |
| Oct 23, 2023 | Ruben Gideon Koellner | 1–0 | Levi Malinowsky | Round 1: Ruben Gideon Köllner - Levi Malinowsky | East Indian Defense | |
| Jul 2, 2023 | Ruben Gideon Koellner | ½–½ | Dinara Wagner | Round 9: Ruben Gideon Koellner - Dinara Wagner | Queen's Pawn Game: Symmetrical Variation | |
| Jul 1, 2023 | Hussain Besou | 0–1 | Ruben Gideon Koellner | Round 8: Hussain Besou - Ruben Gideon Koellner | Ruy Lopez: Classical Defense, Benelux Variation | |
| Jun 30, 2023 | Ruben Gideon Koellner | ½–½ | Karthik Venkataraman | Round 7: Ruben Gideon Koellner - Karthik Venkataraman | Queen's Pawn Game: Colle System | |
| Jun 29, 2023 | Arthur De Winter | 1–0 | Ruben Gideon Koellner | Round 6: Arthur De Winter - Ruben Gideon Koellner | Philidor Defense: Lion Variation | |
| Jun 28, 2023 | Ruben Gideon Koellner | 1–0 | Georgios Souleidis | Round 5: Ruben Gideon Koellner - Georgios Souleidis | Queen's Pawn Game: Symmetrical Variation | |
| Jun 27, 2023 | Alexander Bagrationi | 0–1 | Ruben Gideon Koellner | Round 4: Alexander Bagrationi - Ruben Gideon Koellner | Bogo-Indian Defense: Retreat Variation | |
| Jun 26, 2023 | Ruben Gideon Koellner | 1–0 | Mihail Saltaev | Round 3: Ruben Gideon Koellner - Mihail Saltaev | Caro-Kann Defense: Two Knights Attack, Mindeno Variation | |
| Jun 25, 2023 | Vadym Petrovskyi | ½–½ | Ruben Gideon Koellner | Round 2: Vadym Petrovskiy - Ruben Gideon Koellner | Ruy Lopez: Morphy Defense, Neo-Arkhangelsk Variation | |
| Jun 24, 2023 | Jana Schneider | 0–1 | Ruben Gideon Koellner | Round 1: Jana Schneider - Ruben Gideon Koellner | Philidor Defense: Lion Variation | |
| Mar 12, 2023 | Ruben Gideon Koellner | 1–0 | Kaloyan Popvasilev | Round 9: Ruben Gideon Koellner - Kaloyan Popvasilev | Horwitz Defense | |
| Mar 11, 2023 | Aaron Noah Koellner | 0–1 | Ruben Gideon Koellner | Round 8: Aaron Noah Koellner - Ruben Gideon Koellner | Zukertort Opening | |
| Mar 10, 2023 | Ruben Gideon Koellner | 0–1 | Jan Pubantz | Round 7: Ruben Gideon Koellner - Jan Pubantz | Slav Defense: Exchange Variation, Boor Attack | |
| Mar 9, 2023 | Diptayan Ghosh | 1–0 | Ruben Gideon Koellner | Round 6: Diptayan Ghosh - Ruben Gideon Koellner | Zukertort Opening | |
| Mar 8, 2023 | Ruben Gideon Koellner | 1–0 | Makan Rafiee | Round 5: Ruben Gideon Koellner - Makan Rafiee | Queen's Pawn Game: Zukertort Variation | |
| Mar 7, 2023 | Christoph Ramme | 0–1 | Ruben Gideon Koellner | Round 4: Christoph Ramme - Ruben Gideon Koellner | Old Indian Defense: Normal Variation | |
| Mar 6, 2023 | Matthias Bach | ½–½ | Ruben Gideon Koellner | Round 3: Matthias Bach - Ruben Gideon Koellner | Pirc Defense | |
| Mar 5, 2023 | Ruben Gideon Koellner | 1–0 | Anton Weigand | Round 1: Ruben Gideon Koellner - Anton Weigand | Queen's Pawn Game: Colle System | |
| Mar 20, 2022 | Amit Doshi Moksh | 1–0 | Ruben Gideon Koellner | Round 8: Amit Doshi Moksh - Ruben Gideon Koellner | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Mar 19, 2022 | Ruben Gideon Koellner | ½–½ | Ivajlo Enchev | Round 7: Ruben Gideon Koellner - Ivajlo Enchev | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| Mar 19, 2022 | Anastasios Koukas | 0–1 | Ruben Gideon Koellner | Round 6: Anastasios Koukas - Ruben Gideon Koellner | Philidor Defense: Lion Variation | |
| Mar 18, 2022 | Ruben Gideon Koellner | * | Michael Kotyk | Round 5: Ruben Gideon Koellner - Michael Kotyk | ? | |
| Mar 18, 2022 | Evan Park | 1–0 | Ruben Gideon Koellner | Round 4: Evan Park - Ruben Gideon Koellner | Philidor Defense: Lion Variation | |
| Mar 17, 2022 | Ruben Gideon Koellner | ½–½ | Khumoyun Begmuratov | Round 3: Ruben Gideon Koellner - Khumoyun Begmuratov | East Indian Defense | |
| Mar 17, 2022 | Angelo Damia | * | Ruben Gideon Koellner | Round 2: Angelo Damia - Ruben Gideon Koellner | ? | |
| Mar 16, 2022 | Ruben Gideon Koellner | * | Alessio Gattafoni | Round 1: Ruben Gideon Koellner - Alessio Gattafoni | ? | |
