| 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 | |
