| Apr 23, 2026 | Soderberg | 0–1 | Koehler | Round 5: Soderberg, Per - Koehler, Gerhard, Dr. | Sicilian Defense: Moscow Variation | |
| Apr 22, 2026 | Koehler | ½–½ | Sibilio | Round 4: Koehler, Gerhard, Dr. - Sibilio, Mario | Modern Defense: Kotov Variation | |
| Apr 21, 2026 | Maryasin | 0–1 | Koehler | Round 3: Maryasin, Boris - Koehler, Gerhard, Dr. | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Apr 20, 2026 | Koehler | 1–0 | Schulz | Round 2: Koehler, Gerhard, Dr. - Schulz, Michael | English Opening: King's English Variation, Closed System, Full Symmetry | |
| Apr 19, 2026 | Hymer | 1–0 | Koehler | Round 1: Hymer, Barry - Koehler, Gerhard, Dr. | Rapport-Jobava System | |
| Nov 1, 2025 | Sokolowski | 1–0 | Koehler | Round 11: Sokolowski, Ryszard - Koehler, Gerhard, Dr. | Indian Defense: Anti-Nimzo-Indian | |
| Oct 31, 2025 | Koehler | 0–1 | Pogorelov | Round 10: Koehler, Gerhard, Dr. - Pogorelov, Ruslan | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Oct 30, 2025 | Roos | ½–½ | Koehler | Round 9: Roos, Louis - Koehler, Gerhard, Dr. | Caro-Kann Defense: Exchange Variation | |
| Oct 29, 2025 | Koehler | 1–0 | Kowalczuk | Round 8: Koehler, Gerhard, Dr. - Kowalczuk, Wojciech | Queen's Indian Defense: Kasparov Variation | |
| Oct 28, 2025 | Lebret | 0–1 | Koehler | Round 7: Lebret, Jean-Michel - Koehler, Gerhard, Dr. | Sicilian Defense: Closed | |
| Oct 26, 2025 | Koehler | 0–1 | Ortega | Round 6: Koehler, Gerhard, Dr. - Ortega, Lexy | English Opening: Agincourt Defense | |
| Oct 25, 2025 | Elguezabal Varela | ½–½ | Koehler | Round 5: Elguezabal Varela, Daniel - Koehler, Gerhard, Dr. | Indian Defense: Anti-Nimzo-Indian | |
| Oct 24, 2025 | Koehler | 1–0 | Sciupokas | Round 4: Koehler, Gerhard, Dr. - Sciupokas, Arunas | English Opening: King's English Variation | |
| Oct 23, 2025 | Mencinger | 1–0 | Koehler | Round 3: Mencinger, Vojko - Koehler, Gerhard, Dr. | French Defense: Advance Variation, Wade Variation | |
| Oct 22, 2025 | Koehler | 1–0 | Magnussen | Round 2: Koehler, Gerhard, Dr. - Magnussen, Pal | English Opening: King's English Variation, Four Knights Variation, Flexible Line | |
| Oct 21, 2025 | Fiorentini | 0–1 | Koehler | Round 1: Fiorentini, Mauro - Koehler, Gerhard, Dr. | Sicilian Defense: Najdorf Variation | |
| Sep 29, 2025 | Ftacnik | ½–½ | Koehler | European individual senior chess championship 2025 - Open 65+, Rabac, Croatia | Queen's Indian Defense: Capablanca Variation | |
| Jul 13, 2025 | Bauer | ½–½ | Koehler | Round 7: Bauer, Burkhard - Koehler, Gerhard, Dr. | London System | |
| Jul 12, 2025 | Koehler | 0–1 | Kliewe | Round 6: Koehler, Gerhard, Dr. - Kliewe, Hans-Juergen | English Opening: Caro-Kann Defensive System | |
| Jul 9, 2025 | Stern | 0–1 | Koehler | Round 3: Stern, Geoffrey - Koehler, Gerhard, Dr. | French Defense: Exchange Variation | |
| Jul 8, 2025 | Koehler | 1–0 | Ehlert | Round 2: Koehler, Gerhard, Dr. - Ehlert, Horst | English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | |
| Jul 7, 2025 | Brekenkamp | 0–1 | Koehler | Round 1: Brekenkamp, Juergen - Koehler, Gerhard, Dr. | Nimzo-Indian Defense: Sämisch Variation | |
| Jul 3, 2025 | Koehler | 1–0 | Heinemann | Round 4: Koehler, Gerhard, Dr. - Heinemann, Ernst | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Jul 3, 2025 | Okrajek | 1–0 | Koehler | Round 5: Okrajek, Alexander - Koehler, Gerhard, Dr. | Zukertort Opening: Sicilian Invitation | |
| Feb 26, 2025 | Koehler | 0–1 | Giffard | World Senior Team 2025 S65 | English Opening: King's English Variation, Two Knights Variation, Keres Variation | |
| Feb 25, 2025 | Ceschia | 1–0 | Koehler | World Senior Team 2025 S65 | Sicilian Defense: Chekhover Variation | |
| Feb 24, 2025 | Bjerke | 0–1 | Koehler | World Senior Team 2025 S65 | Caro-Kann Defense: Tartakower Variation | |
| Feb 23, 2025 | Koehler | 1–0 | Hammar | World Senior Team 2025 S65 | King's Indian Defense: Orthodox Variation, Bayonet Attack | |
| Feb 21, 2025 | Koehler | 0–1 | Large | World Senior Team 2025 S65 | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Feb 20, 2025 | Snape | ½–½ | Koehler | World Senior Team 2025 S65 | Old Indian Defense: Normal Variation | |
| Feb 19, 2025 | Raitza | 0–1 | Koehler | World Senior Team 2025 S65 | Sicilian Defense: Najdorf Variation, Opocensky Variation, Modern Line | |
| Feb 18, 2025 | Koehler | ½–½ | Winter | World Senior Team 2025 S65 | English Opening: King's English Variation, Taimanov Variation | |
| Feb 17, 2025 | Koehler | ½–½ | Vavruska | World Senior Team 2025 S65 | English Opening: Agincourt Defense | |
| Aug 31, 2024 | Klundt | 1–0 | Koehler | Round 9: Klundt, Klaus - Koehler, Gerhard, Dr. | Caro-Kann Defense: Panov Attack | |
| Aug 30, 2024 | Koehler | 1–0 | Lutz | Round 8: Koehler, Gerhard, Dr. - Lutz, Albert | King's Indian Defense: Orthodox Variation, Classical System, Neo-Classical Line | |
| Aug 29, 2024 | Ruether | ½–½ | Koehler | Round 7: Ruether, Rudolf - Koehler, Gerhard, Dr. | Benoni Defense: Old Benoni | |
| Aug 28, 2024 | Koehler | 1–0 | Hartlieb | Round 6: Koehler, Gerhard, Dr. - Hartlieb, Juergen | English Opening: Anglo-Indian Defense, Queen's Knight Variation | |
| Aug 27, 2024 | Zimmermann | 1–0 | Koehler | Round 5: Zimmermann, Rolf - Koehler, Gerhard, Dr. | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Aug 26, 2024 | Koehler | 1–0 | Matthey | Round 4: Koehler, Gerhard, Dr. - Matthey, Harald | English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | |
| Aug 25, 2024 | Hanisch | 0–1 | Koehler | Round 3: Hanisch, Friedrich - Koehler, Gerhard, Dr. | Benoni Defense: King's Pawn Line | |
| Aug 23, 2024 | Fleischer | ½–½ | Koehler | Round 1: Fleischer, Matthias - Koehler, Gerhard, Dr. | Indian Defense: Colle System, King's Indian Variation | |
| Jul 6, 2024 | Erler | ½–½ | Koehler | Round 6: Erler, Rainer - Koehler, Gerhard, Dr. | Sicilian Defense: Closed | |
| Jul 5, 2024 | Koehler | 1–0 | Waltenberger | Round 5: Koehler, Gerhard, Dr. - Waltenberger, Udo | English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | |
| Jul 4, 2024 | Heise | 0–1 | Koehler | Round 4: Heise, Juergen - Koehler, Gerhard, Dr. | Nimzo-Larsen Attack: Indian Variation | |
| Jul 3, 2024 | Koehler | ½–½ | Renner | Round 3: Koehler, Gerhard, Dr. - Renner, Bernd | English Opening: King's English Variation, Two Knights Variation, Smyslov System | |
| Jul 1, 2024 | Koehler | 1–0 | Albert | Round 1: Koehler, Gerhard, Dr. - Albert, Gerhard | English Opening: Caro-Kann Defensive System | |
| Jul 1, 2024 | Koehler | 1–0 | Schnelzer | Round 7: Koehler, Gerhard, Dr. - Schnelzer, Reinhold, Dr. | English Opening: King's English Variation, Two Knights Variation, Smyslov System | |
| Jul 1, 2024 | Gehrmann | ½–½ | Koehler | Round 2: Gehrmann, Rudolf-Rainer - Koehler, Gerhard, Dr. | Kangaroo Defense | |
| Oct 26, 2023 | Koehler | * | Gueci | 65+ World Senior Championship | ? | |
| Oct 25, 2023 | Colombo | * | Koehler | 65+ World Senior Championship | ? | |
| Oct 13, 2023 | Koehler | ½–½ | Babrikowski | new tournament description | English Opening: Anglo-Indian Defense, Queen's Knight Variation | |
| Oct 12, 2023 | Weidlich | ½–½ | Koehler | new tournament description | Indian Defense: London System | |
| Oct 9, 2023 | Koehler | ½–½ | Heinig | 31. offene S?chsische Senioren-Einzelmeisterschaft | King's Indian Defense: Normal Variation, Standard Development | |
| Aug 12, 2022 | Huhn | 0–1 | Koehler | 65+ German Senior Championship | French Defense: MacCutcheon Variation, Lasker Variation | |
