| Jul 24, 2026 | Klundt | 0–1 | Brueggemann | Round 8: Klundt, Klaus - Brueggemann, Joachim | Sicilian Defense: Najdorf Variation, Amsterdam Variation | |
| Jul 23, 2026 | Paulsen | 0–1 | Klundt | Round 7: Paulsen, Dirk - Klundt, Klaus | Queen's Gambit Declined: Anti-Tartakower Variation | |
| Jul 22, 2026 | Klundt | 1–0 | Seibold | Round 6: Klundt, Klaus - Seibold, Hubert, Dr. | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jul 21, 2026 | Heck | ½–½ | Klundt | Round 5: Heck, Norbert - Klundt, Klaus | Catalan Opening: Closed, Main Line | |
| Jul 20, 2026 | Klundt | ½–½ | Namyslo | Round 4: Klundt, Klaus - Namyslo, Holger | Ruy Lopez: Morphy Defense | |
| Jul 19, 2026 | Ohst | 0–1 | Klundt | Round 3: Ohst, Holger, Dr. - Klundt, Klaus | English Opening: Carls-Bremen System | |
| Jul 18, 2026 | Klundt | 1–0 | Jurij Vasiljev | Round 2: Klundt, Klaus - Jurij Vasiljev | Sicilian Defense: Magnus Smith Trap | |
| Jul 17, 2026 | Goettfert | 0–1 | Klundt | Round 1: Goettfert, Michael, Prof. Dr. - Klundt, Klaus | Sicilian Defense: Taimanov Variation | |
| Jul 4, 2026 | Schumacher | 0–1 | Klundt | Round 9: Schumacher, Gottfried - Klundt, Klaus | Zukertort Opening | |
| Jul 3, 2026 | Klundt | ½–½ | Heck | Round 8: Klundt, Klaus - Heck, Norbert | Sicilian Defense: O'Kelly Variation, Réti System | |
| Jul 2, 2026 | Klundt | 1–0 | Tscharotschkin | Round 7: Klundt, Klaus - Tscharotschkin, Michael | French Defense: Tarrasch Variation, Closed Variation | |
| Jul 1, 2026 | Junger | ½–½ | Klundt | Round 6: Junger, Werner - Klundt, Klaus | English Opening: Mikenas-Carls Variation | |
| Jun 30, 2026 | Klundt | 1–0 | Jackson | Round 5: Klundt, Klaus - Jackson, Oliver A | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Jun 29, 2026 | Schober | ½–½ | Klundt | Round 4: Schober, Ralf - Klundt, Klaus | Indian Defense: Accelerated London System | |
| Jun 28, 2026 | Klundt | ½–½ | Eichner | Round 3: Klundt, Klaus - Eichner, Christian | Ruy Lopez: Exchange Variation | |
| Jun 27, 2026 | Schaefer | 0–1 | Klundt | Round 2: Schaefer, Martin, Dr. - Klundt, Klaus | Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense | |
| Jun 26, 2026 | Klundt | 1–0 | Bogumil-Schott | Round 1: Klundt, Klaus - Bogumil-Schott, Edgar, Dr. | Scandinavian Defense: Gubinsky-Melts Defense | |
| Nov 22, 2025 | Klundt | 0–1 | Pajeken | Heusenstamm Sparkassen Open 2025 | Sicilian Defense: Najdorf Variation, English Attack | |
| Sep 25, 2025 | Polster | 0–1 | Klundt | Round 5: Polster, Wolfgang, Dr. - Klundt, Klaus | Sicilian Defense: Closed | |
| Sep 23, 2025 | Fritsch | ½–½ | Klundt | Round 3: Fritsch, Rolf - Klundt, Klaus | Bird Opening | |
| Sep 21, 2025 | Mueller von Blumencron | ½–½ | Klundt | Round 1: Mueller von Blumencron, Heiko - Klundt, Klaus | Queen's Pawn Game: Symmetrical Variation | |
| Jul 12, 2025 | Habibi | 0–1 | Klundt | 10. Offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | ? | |
| Jul 11, 2025 | Klundt | 1–0 | Schwalb | 10. Offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Philidor Defense: Lion Variation | |
| Jul 8, 2025 | Toenniges | 1–0 | Klundt | 10. Offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Jul 5, 2025 | Klundt | 1–0 | Zimmermann | 10. Offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Caro-Kann Defense: Panov Attack | |
| Jul 4, 2025 | Leutz | 0–1 | Klundt | 10. Offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Queen's Pawn Game: Colle System | |
| Aug 31, 2024 | Klundt | 1–0 | Koehler | Round 9: Klundt, Klaus - Koehler, Gerhard, Dr. | Caro-Kann Defense: Panov Attack | |
| Aug 30, 2024 | Okrajek | ½–½ | Klundt | Round 8: Okrajek, Alexander - Klundt, Klaus | Queen's Pawn Game: Colle System | |
| Aug 29, 2024 | Klundt | 1–0 | Rosen | Round 7: Klundt, Klaus - Rosen, Willy | Sicilian Defense: Godiva Variation | |
| Aug 28, 2024 | Gries | 0–1 | Klundt | Round 6: Gries, Volker - Klundt, Klaus | Sicilian Defense: French Variation | |
| Aug 27, 2024 | Klundt | 0–1 | Dekan | Round 5: Klundt, Klaus - Dekan, Hans | Sicilian Defense: Classical Variation | |
| Aug 25, 2024 | Klundt | 1–0 | Huettemann | Round 3: Klundt, Klaus - Huettemann, Karl-Heinz | Sicilian Defense: Scheveningen Variation, English Attack, with f3 | |
| Aug 24, 2024 | Larem | 0–1 | Klundt | Round 2: Larem, Ewald - Klundt, Klaus | Queen's Gambit Declined: Lasker Defense, Teichmann Variation | |
| Aug 23, 2024 | Klundt | 1–0 | Juenger | Round 1: Klundt, Klaus - Juenger, Leonhard | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Aug 22, 2024 | Namyslo | ½–½ | Klundt | Round 4: Namyslo, Holger - Klundt, Klaus | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Novosibirsk Variation | |
| Aug 12, 2022 | Klundt | 1–0 | Hartstock | 65+ German Senior Championship | Sicilian Defense: O'Kelly Variation, Yerevan System | |
| Nov 21, 2021 | Kleibel | 1–0 | Klundt | Heusenstamm Sparkassen Open 2021 | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Nov 20, 2021 | Klundt | ½–½ | Schupp | Heusenstamm Sparkassen Open 2021 | Sicilian Defense: Kan Variation, Modern Variation | |
| Nov 19, 2021 | Klundt | ½–½ | Calvi | Heusenstamm Sparkassen Open 2021 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Nov 18, 2021 | Klundt | ½–½ | Ersoez | Heusenstamm Sparkassen Open 2021 | Sicilian Defense: Dragon Variation | |