| 24 jul 2026 | Knaak, Joachim 2146 | Gruzmann, Boris 2044 | 0-1 | E63 Defensa India de Rey: Fianchetto Variation, Panno Variation | German Chess Championship 2026 | Seniors 65+ | 40 | Ver |
| 23 jul 2026 | Gruzmann, Boris 2044 | Himmel, Hansjoerg 2210 | ½-½ | B40 Defensa Siciliana: French Variation, Normal | German Chess Championship 2026 | Seniors 65+ | 22 | Ver |
| 23 oct 2025 | Gruzmann, Boris 2078 | Kalegin, Evgenij 2285 | 0-1 | B42 Defensa Siciliana: Kan Variation, Polugaevsky Variation | FIDE World Senior Championship 2025 | Open 65+ | 37 | Ver |
| 22 oct 2025 | Ginsburg, Mark 2262 | Gruzmann, Boris 2078 | ½-½ | E91 Defensa India de Rey: Orthodox Variation | FIDE World Senior Championship 2025 | Open 65+ | 31 | Ver |
| 27 sep 2025 | Gruzmann, Boris 2088 | Weidemann, Joerg 2230 | ½-½ | C02 Defensa Francesa: Advance Variation, Lputian Variation | German Senior Team Championship of the State Associations | S65 | 50 | Ver |
| 26 sep 2025 | Siebenhaar, Erich 2087 | Gruzmann, Boris 2088 | ½-½ | C44 Apertura Ponziani: Jaenisch Counterattack | German Senior Team Championship of the State Associations | S65 | 15 | Ver |
| 25 sep 2025 | Okrajek, Alexander 2185 | Gruzmann, Boris 2088 | ½-½ | A15 English Orangutan | German Senior Team Championship of the State Associations | S65 | 79 | Ver |
| 24 sep 2025 | Gruzmann, Boris 2088 | Pruefer, Friedbert, Prof. Dr. 2212 | ½-½ | B07 Defensa Pirc: 150 Attack | German Senior Team Championship of the State Associations | S65 | 38 | Ver |
| 23 sep 2025 | Silberschlag, Joerg 2164 | Gruzmann, Boris 2088 | 1-0 | A49 Defensa India: Przepiorka Variation | German Senior Team Championship of the State Associations | S65 | 43 | Ver |
| 22 sep 2025 | Gruzmann, Boris 2088 | Vogel, Robert 2160 | 0-1 | B63 Defensa Siciliana: Richter-Rauzer Variation, Classical Variation | German Senior Team Championship of the State Associations | S65 | 42 | Ver |