| 15 ago 2026 | Costa, Leonardo 2555 | Shyaam Nikhil P 2428 | 1-0 | B41 Defensa Siciliana: Kan Variation | Spilimbergo Master 2026 | 49 | Ver |
| 14 ago 2026 | Sardana, Rishi 2506 | Costa, Leonardo 2555 | 1-0 | B67 Defensa Siciliana: Richter-Rauzer Variation, Neo-Modern Variation | Spilimbergo Master 2026 | 39 | Ver |
| 13 ago 2026 | Costa, Leonardo 2555 | Muthaiah AL 2455 | 1-0 | D00 Apertura de Peón de Dama: Accelerated London System, Steinitz Countergambit | Spilimbergo Master 2026 | 37 | Ver |
| 12 ago 2026 | Chasin, Nico 2470 | Costa, Leonardo 2555 | ½-½ | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | Spilimbergo Master 2026 | 57 | Ver |
| 11 ago 2026 | Costa, Leonardo 2555 | Rios Gomez, Cristhian Camilo 2406 | 1-0 | A45 Defensa India: Accelerated London System | Spilimbergo Master 2026 | 26 | Ver |
| 10 ago 2026 | Costa, Leonardo 2555 | Marin, Mihail 2402 | ½-½ | B40 Defensa Siciliana: French Variation | Spilimbergo Master 2026 | 56 | Ver |
| 10 ago 2026 | Keleberda, Tymur 2335 | Costa, Leonardo 2555 | 0-1 | D31 Gambito de Dama rehusado: Queen's Knight Variation | Spilimbergo Master 2026 | 57 | Ver |
| 8 ago 2026 | Budyi, Danylo 2209 | Costa, Leonardo 2555 | ½-½ | D36 Gambito de Dama rehusado: Exchange Variation, Reshevsky Variation | Spilimbergo Master 2026 | 41 | Ver |
| 24 jul 2026 | Hagner, Bennet 2451 | Costa, Leonardo 2540 | 0-1 | D26 Gambito de Dama aceptado: Classical Defense, Steinitz Variation, Exchange Variation | German Chess Championship 2026 | Masters Men | 53 | Ver |
| 23 jul 2026 | Costa, Leonardo 2540 | Svane, Rasmus 2624 | ½-½ | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo | German Chess Championship 2026 | Masters Men | 33 | Ver |
| 22 jul 2026 | Braun, Georg, Dr. 2374 | Costa, Leonardo 2540 | 0-1 | B89 Defensa Siciliana: Velimirovic Attack | German Chess Championship 2026 | Masters Men | 24 | Ver |
| 21 jul 2026 | Costa, Leonardo 2540 | Kuegel, Tobias 2361 | ½-½ | C42 Defensa Petrov: Classical Attack | German Chess Championship 2026 | Masters Men | 50 | Ver |
| 20 jul 2026 | Donchenko, Alexander 2635 | Costa, Leonardo 2540 | 1-0 | E06 Apertura Catalana: Closed | German Chess Championship 2026 | Masters Men | 47 | Ver |
| 19 jul 2026 | Wagner, Dennis 2589 | Costa, Leonardo 2540 | 0-1 | D30 Gambito de Dama rehusado | German Chess Championship 2026 | Masters Men | 50 | Ver |
| 18 jul 2026 | Costa, Leonardo 2540 | Engel, Luis 2588 | 1-0 | B90 Defensa Siciliana: Najdorf Variation, Adams Attack | German Chess Championship 2026 | Masters Men | 36 | Ver |
| 18 jul 2026 | Huschenbeth, Niclas 2586 | Costa, Leonardo 2540 | ½-½ | B11 Defensa Caro-Kann: Two Knights Attack, Mindeno Variation, Exchange Line | German Chess Championship 2026 | Masters Men | 40 | Ver |
| 26 abr 2026 | Bologan, Victor 2590 | Costa, Leonardo 2556 | 1-0 | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo | German Bundesliga 2025/26 | 62 | Ver |
| 25 abr 2026 | Costa, Leonardo 2556 | L'Ami, Erwin 2591 | ½-½ | B92 Defensa Siciliana: Najdorf Variation, Opocensky Variation | German Bundesliga 2025/26 | 45 | Ver |
| 24 abr 2026 | Kollars, Dmitrij 2632 | Costa, Leonardo 2556 | ½-½ | E06 Apertura Catalana: Closed | BL 2526 Schachfreunde Deizisau - MSA Zugzwang | 36 | Ver |
| 19 abr 2026 | Costa, Leonardo 2556 | Jakubowski, Krzysztof 2434 | 1-0 | C02 Defensa Francesa: Advance Variation, Main Line | EICC 2026 | 49 | Ver |