| 2 ago 2026 | Costachi, Mihnea 2381 | Lupulescu, Constantin 2524 | ½-½ | D37 Gambito de Dama rehusado: Barmen Variation | Alba Grand Prix Rapid 2026 | 33 | Ver |
| 2 ago 2026 | Ratkovic, Petar 2151 | Costachi, Mihnea 2381 | 0-1 | A48 Apertura de Peón de Dama: Barry Attack, Grünfeld Variation | Alba Grand Prix Rapid 2026 | 55 | Ver |
| 2 ago 2026 | Costachi, Mihnea 2381 | Nedelea, Ariton-Vasile 2210 | 1-0 | E10 Defensa India: Anti-Nimzo-Indian | Alba Grand Prix Rapid 2026 | 40 | Ver |
| 2 ago 2026 | Craciun, Sasha-Matei 2256 | Costachi, Mihnea 2381 | ½-½ | C47 Apertura de los Cuatro Caballos | Alba Grand Prix Rapid 2026 | 41 | Ver |
| 2 ago 2026 | Perunovic, Milos 2560 | Costachi, Mihnea 2381 | 1-0 | C72 Apertura Española (Ruy López): Morphy Defense, Modern Steinitz Defense | Alba Grand Prix Rapid 2026 | 40 | Ver |
| 1 ago 2026 | Costachi, Mihnea 2381 | Veneteanu, Mihai 2091 | ½-½ | D78 Defensa Neogrünfeld: Classical Variation, Original Defense | Alba Grand Prix Rapid 2026 | 64 | Ver |
| 1 ago 2026 | Balaban-Voia, Alexandru 2151 | Costachi, Mihnea 2381 | 0-1 | A05 Ataque Indio de Rey: Symmetrical Defense | Alba Grand Prix Rapid 2026 | 28 | Ver |
| 30 nov 2025 | Georgiev, Kiril 2556 | Costachi, Mihnea 2477 | ½-½ | A15 Apertura Inglesa: Anglo-Indian Defense, King's Indian Formation | European Rapid & Blitz Chess Championships 2025 | Blitz | 40 | Ver |
| 30 nov 2025 | Costachi, Mihnea 2477 | Iturrizaga Bonelli, Eduardo 2630 | 0-1 | E11 Defensa Bogoindia: Wade-Smyslov Variation | European Rapid & Blitz Chess Championships 2025 | Blitz | 55 | Ver |
| 30 nov 2025 | Pantsulaia, Levan 2572 | Costachi, Mihnea 2477 | ½-½ | A05 Ataque Indio de Rey: Symmetrical Defense | European Rapid & Blitz Chess Championships 2025 | Blitz | 55 | Ver |
| 30 nov 2025 | Costachi, Mihnea 2477 | Anton Guijarro, David 2560 | 1-0 | E11 Defensa Bogoindia: Nimzowitsch Variation | European Rapid & Blitz Chess Championships 2025 | Blitz | 33 | Ver |
| 30 nov 2025 | Uruci, Ardit 2026 | Costachi, Mihnea 2477 | 0-1 | C44 Apertura Escocesa: Cochrane-Shumov Defense | European Rapid & Blitz Chess Championships 2025 | Blitz | 53 | Ver |
| 30 nov 2025 | Costachi, Mihnea 2477 | Plat, Vojtech 2562 | 0-1 | B00 Defensa Pirc | European Rapid & Blitz Chess Championships 2025 | Blitz | 102 | Ver |
| 30 nov 2025 | Livaic, Leon 2569 | Costachi, Mihnea 2477 | 0-1 | A06 Apertura Zukertort: Old Indian Attack | European Rapid & Blitz Chess Championships 2025 | Blitz | 44 | Ver |
| 30 nov 2025 | Costachi, Mihnea 2477 | Kukelko, Alexey 2282 | 1-0 | D45 Defensa Semieslava: Stoltz Variation, Shabalov Attack | European Rapid & Blitz Chess Championships 2025 | Blitz | 59 | Ver |
| 30 nov 2025 | Boci, Mateu 2137 | Costachi, Mihnea 2477 | 0-1 | C72 Apertura Española (Ruy López): Morphy Defense, Modern Steinitz Defense | European Rapid & Blitz Chess Championships 2025 | Blitz | 37 | Ver |
| 30 nov 2025 | Costachi, Mihnea 2477 | Wojtaszek, Radoslaw 2605 | 0-1 | E11 Defensa Bogoindia: Wade-Smyslov Variation | European Rapid & Blitz Chess Championships 2025 | Blitz | 42 | Ver |
| 30 nov 2025 | Markocic, Tine 2143 | Costachi, Mihnea 2477 | 0-1 | A16 Apertura Inglesa: Anglo-Indian Defense, Queen's Knight Variation | European Rapid & Blitz Chess Championships 2025 | Blitz | 32 | Ver |
| 30 nov 2025 | Costachi, Mihnea 2477 | Kuipers, Dustin 2066 | 1-0 | D31 Gambito de Dama rehusado: Janowski Variation | European Rapid & Blitz Chess Championships 2025 | Blitz | 45 | Ver |
| 29 nov 2025 | Stamatiou, Rodolfos 2152 | Costachi, Mihnea 2413 | 1-0 | E91 Defensa India de Rey: Kazakh Variation | European Rapid & Blitz Chess Championships 2025 | Rapid | 39 | Ver |