| Nov 1, 2025 | Gruzmann | 1–0 | Allakhverdiev | Round 11: Gruzmann, Boris - Allakhverdiev, Eduard | Elephant Gambit: Paulsen Countergambit | |
| Oct 31, 2025 | Sosa Patino | 1–0 | Gruzmann | Round 10: Sosa Patino, Carlos - Gruzmann, Boris | English Opening: King's English Variation | |
| Oct 30, 2025 | Gruzmann | ½–½ | Sciupokas | Round 9: Gruzmann, Boris - Sciupokas, Arunas | Nimzowitsch Defense: Williams Variation | |
| Oct 29, 2025 | Jhunjhnuwala | 0–1 | Gruzmann | Round 8: Jhunjhnuwala, Suresh - Gruzmann, Boris | Scotch Game: Mieses Variation | |
| Oct 28, 2025 | Gruzmann | 0–1 | Pepe | Round 7: Gruzmann, Boris - Pepe, Mario | Alekhine Defense: Balogh Variation | |
| Oct 26, 2025 | Frisen | ½–½ | Gruzmann | Round 6: Frisen, Hakan - Gruzmann, Boris | King's Indian Defense: Fianchetto Variation, Panno Variation | |
| Oct 25, 2025 | Gruzmann | 1–0 | Sibille | Round 5: Gruzmann, Boris - Sibille, Ettore | Pirc Defense | |
| Oct 24, 2025 | Deubelbeiss | 1–0 | Gruzmann | Round 4: Deubelbeiss, Rene - Gruzmann, Boris | English Opening: King's English Variation, Taimanov Variation | |
| Oct 23, 2025 | Gruzmann | 0–1 | Kalegin | Round 3: Gruzmann, Boris - Kalegin, Evgenij | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Oct 22, 2025 | Ginsburg | ½–½ | Gruzmann | Round 2: Ginsburg, Mark - Gruzmann, Boris | King's Indian Defense: Orthodox Variation | |
| Oct 21, 2025 | Gruzmann | 1–0 | Zangrando | Round 1: Gruzmann, Boris - Zangrando, Gianpietro | French Defense: Advance Variation, Wade Variation | |
| Sep 27, 2025 | Gruzmann | ½–½ | Weidemann | Round 7: Gruzmann, Boris - Weidemann, Joerg | French Defense: Advance Variation, Lputian Variation | |
| Sep 26, 2025 | Siebenhaar | ½–½ | Gruzmann | Round 6: Siebenhaar, Erich - Gruzmann, Boris | Ponziani Opening: Jaenisch Counterattack | |
| Sep 25, 2025 | Okrajek | ½–½ | Gruzmann | Round 5: Okrajek, Alexander - Gruzmann, Boris | English Opening: Anglo-Indian Defense, King's Indian Formation | |
| Sep 24, 2025 | Gruzmann | ½–½ | Pruefer | Round 4: Gruzmann, Boris - Pruefer, Friedbert, Prof. Dr. | Pirc Defense: 150 Attack | |
| Sep 23, 2025 | Silberschlag | 1–0 | Gruzmann | Round 3: Silberschlag, Joerg - Gruzmann, Boris | Indian Defense: Przepiorka Variation | |
| Sep 22, 2025 | Gruzmann | 0–1 | Vogel | Round 2: Gruzmann, Boris - Vogel, Robert | Sicilian Defense: Richter-Rauzer Variation, Classical Variation | |
| Nov 18, 2024 | Legky | 1–0 | Gruzmann | World Senior Chess Championship 2024 | King's Indian Defense: Sämisch Variation | |
| Aug 31, 2024 | Polster | 1–0 | Gruzmann | Round 9: Polster, Wolfgang, Dr. - Gruzmann, Boris | Four Knights Game: Glek System | |
| Aug 30, 2024 | Gruzmann | 1–0 | Gries | Round 8: Gruzmann, Boris - Gries, Volker | Petrov's Defense: Nimzowitsch Attack | |
| Aug 26, 2024 | Gruzmann | 0–1 | Kornrumpf | Round 4: Gruzmann, Boris - Kornrumpf, Joachim | Sicilian Defense: Kan Variation, Modern Variation | |
| Aug 25, 2024 | Gollasch | ½–½ | Gruzmann | Round 3: Gollasch, Theo-Heinz - Gruzmann, Boris | King's Indian Defense: Fianchetto Variation, Panno Variation | |
| Aug 24, 2024 | Gruzmann | 1–0 | Wild | Round 2: Gruzmann, Boris - Wild, Helmut | Caro-Kann Defense: Advance Variation | |
| Aug 23, 2024 | Stuhlmann | 0–1 | Gruzmann | Round 1: Stuhlmann, Alexander - Gruzmann, Boris | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Oct 26, 2023 | Smolin | * | Gruzmann | 65+ World Senior Championship | ? | |
| Oct 25, 2023 | Gruzmann | * | Bondar | 65+ World Senior Championship | ? | |
| Aug 12, 2022 | Gruzmann | 1–0 | Abel | 65+ German Senior Championship | Pirc Defense: Byrne Variation | |
