| 30 abr 2026 | Bertagnolli, Alexander 2341 | Efimov, Igor 2318 | ½-½ | B00 Defensa Pirc | Finals: Bertagnolli, Alexander - Efimov, Igor | 6 | Ver |
| 29 abr 2026 | Carlo, Emanuele 2300 | Efimov, Igor 2318 | ½-½ | B06 Defensa Moderna | Semifinals: Carlo, Emanuele - Efimov, Igor | 70 | Ver |
| 28 abr 2026 | Ceres, Dragos 2450 | Efimov, Igor 2318 | 1-0 | B01 Defensa Escandinava: Valencian Variation | Italian Team Championship 2026 | Group B | 25 | Ver |
| 27 abr 2026 | Marzocchi, Tommaso 2303 | Efimov, Igor 2318 | ½-½ | C17 Defensa Francesa: Winawer Variation, Advance Variation | Italian Team Championship 2026 | Group B | 8 | Ver |
| 27 abr 2026 | Efimov, Igor 2318 | Stella, Andrea 2370 | ½-½ | D53 Gambito de Dama rehusado | Italian Team Championship 2026 | Group B | 17 | Ver |
| 26 abr 2026 | Efimov, Igor 2318 | Bertagnolli, Alexander 2341 | 1-0 | D02 Apertura de Peón de Dama: Symmetrical Variation, Pseudo-Catalan | Italian Team Championship 2026 | Group B | 57 | Ver |
| 25 abr 2026 | Yao, Stefano 2268 | Efimov, Igor 2318 | ½-½ | A15 Apertura Inglesa: Anglo-Indian Defense, Queen's Indian Formation | Italian Team Championship 2026 | Group B | 10 | Ver |
| 25 abr 2026 | Efimov, Igor 2318 | De Filomeno, Simone 2445 | ½-½ | B22 Defensa Siciliana: Alapin Variation | Italian Team Championship 2026 | Group B | 8 | Ver |
| 24 abr 2026 | Lumachi, Gabriele 2421 | Efimov, Igor 2318 | 1-0 | C10 Defensa Francesa: Paulsen Variation | Italian Team Championship 2026 | Group B | 42 | Ver |
| 21 feb 2026 | Vuelban, Virgilio 2200 | Efimov, Igor 2321 | ½-½ | B00 Defensa Pirc | iii Festival della Dragonara | 31 | Ver |
| 21 feb 2026 | Efimov, Igor 2321 | Margaryan, Aram 2065 | 1-0 | D94 Defensa Grünfeld: Opocensky Variation | iii Festival della Dragonara | 60 | Ver |
| 20 feb 2026 | Simonelli, Mattia 2030 | Efimov, Igor 2321 | 0-1 | A41 Apertura de Peón de Dama: Rossolimo Variation | iii Festival della Dragonara | 44 | Ver |
| 22 nov 2025 | Efimov, Igor 2331 | Isaakidis, Alexandros 2248 | 0-1 | B18 Defensa Caro-Kann: Classical Variation | 9th ESNA Chess Championship 2025 | 22 | Ver |
| 19 nov 2025 | De La Riva Aguado, Oscar 2439 | Efimov, Igor 2331 | ½-½ | B33 Defensa Siciliana: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | 9th ESNA Chess Championship 2025 | 14 | Ver |
| 18 nov 2025 | Efimov, Igor 2331 | Wiedenkeller, Michael 2387 | ½-½ | E49 Defensa Nimzoindia: Normal Variation, Botvinnik System | 9th ESNA Chess Championship 2025 | 13 | Ver |
| 17 nov 2025 | Novak, Attila Robert 2155 | Efimov, Igor 2331 | ½-½ | A41 Apertura de Peón de Dama: Rossolimo Variation | 9th ESNA Chess Championship 2025 | 31 | Ver |
| 16 nov 2025 | Efimov, Igor 2331 | Holland, Christopher 2068 | 1-0 | E60 Defensa India de Rey: Normal Variation, King's Knight Variation | 9th ESNA Chess Championship 2025 | 83 | Ver |
| 14 nov 2025 | Krieger, Markus 2168 | Efimov, Igor 2331 | 1-0 | C01 Defensa Francesa: Exchange Variation | 9th ESNA Chess Championship 2025 | 52 | Ver |
| 2 nov 2025 | Gurel, Ediz 2648 | Efimov, Igor 2331 | 1-0 | B41 Defensa Siciliana: Kan Variation, Maróczy Bind, Hedgehog Variation | FIDE World Cup 2025 | 26 | Ver |
| 31 oct 2025 | Efimov, Igor 2331 | Gurel, Ediz 2648 | 0-1 | A06 Apertura Zukertort | FIDE World Cup 2025 | 40 | Ver |