| 23 jul 2026 | Basaric, Srdjan 2084 | Brejnik, Gustav 2229 | 0-1 | B10 Defensa Caro-Kann: Breyer Variation | CZECH OPEN 2026 - G1 - PARDUBICKY KRAJ OPEN | 58 | Ver |
| 23 jul 2026 | Mohota, Nisha 2084 | Brejnik, Gustav 2229 | 1-0 | B13 Defensa Caro-Kann: Exchange Variation | CZECH OPEN 2026 - G1 - PARDUBICKY KRAJ OPEN | 37 | Ver |
| 23 jul 2026 | Pogorelskiy, Boris 2002 | Brejnik, Gustav 2229 | 1-0 | B15 Defensa Caro-Kann: Tartakower Variation | CZECH OPEN 2026 - G1 - PARDUBICKY KRAJ OPEN | 42 | Ver |
| 22 jul 2026 | Brejnik, Gustav 2229 | Kastner, Oldrich 2017 | ½-½ | E15 Defensa India de Dama: Fianchetto Variation | CZECH OPEN 2026 - G1 - PARDUBICKY KRAJ OPEN | 59 | Ver |
| 22 jul 2026 | Navara, David 2602 | Brejnik, Gustav 2229 | 1-0 | B12 Defensa Caro-Kann: Advance Variation | CZECH OPEN 2026 - G1 - PARDUBICKY KRAJ OPEN | 64 | Ver |
| 28 jun 2026 | Slaby, Matej 2116 | Brejnik, Gustav 2250 | 1-0 | A09 Apertura Réti: Advance Variation | 21. Zlata Praha Rapid Open 2026 | 59 | Ver |
| 28 jun 2026 | Verner, Matej 2009 | Brejnik, Gustav 2250 | 0-1 | B10 Defensa Caro-Kann: Accelerated Panov Attack, Modern Variation | 21. Zlata Praha Rapid Open 2026 | 50 | Ver |
| 28 jun 2026 | Brejnik, Gustav 2250 | Shamian, Artur 2060 | 0-1 | E11 Defensa Bogoindia: Grünfeld Variation | 21. Zlata Praha Rapid Open 2026 | 40 | Ver |
| 27 jun 2026 | Brejnik, Gustav 2248 | Shagbazyan, Taron 2495 | 1-0 | E05 Apertura Catalana: Open Defense, Classical Line | 21. Zlata Praha Blitz Open 2026 | 23 | Ver |
| 27 jun 2026 | Hrabusa, Matej 2253 | Brejnik, Gustav 2248 | 1-0 | A06 Apertura Zukertort | 21. Zlata Praha Blitz Open 2026 | 29 | Ver |
| 27 jun 2026 | Brejnik, Gustav 2248 | Filindash, Nikita 2262 | 1-0 | E05 Apertura Catalana: Open Defense, Classical Line | 21. Zlata Praha Blitz Open 2026 | 99 | Ver |
| 27 jun 2026 | Shamian, Artur 2007 | Brejnik, Gustav 2248 | 0-1 | D00 Apertura de Peón de Dama: Accelerated London System, Steinitz Countergambit | 21. Zlata Praha Blitz Open 2026 | 28 | Ver |
| 27 jun 2026 | Druska, Juraj 2418 | Brejnik, Gustav 2248 | 1-0 | D04 Apertura de Peón de Dama: Colle System | 21. Zlata Praha Blitz Open 2026 | 42 | Ver |
| 20 dic 2025 | Zwardon, Vojtech 2402 | Brejnik, Gustav 2208 | 1-0 | A13 Apertura Inglesa: Agincourt Defense | Czech Blitz Championship 2025 | 34 | Ver |
| 20 dic 2025 | Brejnik, Gustav 2208 | Rubes, Jan 2458 | 0-1 | D31 Gambito de Dama rehusado: Queen's Knight Variation | Czech Blitz Championship 2025 | 50 | Ver |
| 20 dic 2025 | Haba, Petr 2491 | Brejnik, Gustav 2208 | 1-0 | B12 Defensa Caro-Kann: Advance Variation, Botvinnik-Carls Defense | Czech Blitz Championship 2025 | 37 | Ver |