| Jun 30, 2026 | Leiva | 1–0 | Gomez Flores | Round 6: Leiva, Gianmarco - Gomez Flores, Pol | Bogo-Indian Defense: Retreat Variation | |
| Jun 29, 2026 | Marrujo Pardo | 1–0 | Leiva | Round 5: Marrujo Pardo, Mauricio Emmanuel - Leiva, Gianmarco | Sicilian Defense: Closed, Anti-Sveshnikov Variation, with Nf6 | |
| Jun 27, 2026 | Hong | 0–1 | Leiva | Round 3: Hong, Joohyuk - Leiva, Gianmarco | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| Jun 26, 2026 | Leiva | 1–0 | Lobo Pereira | Round 2: Leiva, Gianmarco - Lobo Pereira, Arami | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jun 25, 2026 | Torres Teruel | 0–1 | Leiva | Round 1: Torres Teruel, Joan - Leiva, Gianmarco | Sicilian Defense: Closed | |
| Jun 21, 2026 | Leiva | ½–½ | Solodovnichenko | Round 4: Leiva, Gianmarco - Solodovnichenko, Yuri | English Opening: Agincourt Defense | |
| May 10, 2026 | Jianu | 1–0 | Leiva | Round 10: Jianu, Vlad-Cristian - Leiva, Gianmarco | Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line | |
| May 10, 2026 | Leiva | 1–0 | Ienasoaie | Round 9: Leiva, Gianmarco - Ienasoaie, Rafael | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| May 10, 2026 | Pop | 0–1 | Leiva | Round 8: Pop, Alexandru - Leiva, Gianmarco | Nimzo-Indian Defense: Reshevsky Variation | |
| May 10, 2026 | Leiva | ½–½ | Dodoi | Round 7: Leiva, Gianmarco - Dodoi, Matei-Teodor | Sicilian Defense: Moscow Variation | |
| May 10, 2026 | Dobre | * | Leiva | Round 6: Dobre, Claudiu-Cristian - Leiva, Gianmarco | ? | |
| May 10, 2026 | Leiva | * | Antonica | Round 5: Leiva, Gianmarco - Antonica, Dragos-Andrei | ? | |
| May 9, 2026 | Korcsek | ½–½ | Leiva | Round 4: Korcsek, Alexandru-David - Leiva, Gianmarco | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| May 9, 2026 | Leiva | 1–0 | Skomial | Round 3: Leiva, Gianmarco - Skomial, Mateusz | Petrov's Defense: Karklins-Martinovsky Variation | |
| May 9, 2026 | Trifoi | 0–1 | Leiva | Round 2: Trifoi, Mihaela-Ioana - Leiva, Gianmarco | Sicilian Defense: Moscow Variation, Main Line | |
| May 9, 2026 | Leiva | 1–0 | Rosu | Round 1: Leiva, Gianmarco - Rosu, Vlad-Andrei | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Apr 4, 2026 | Martin Cabeza | 1–0 | Leiva | Round 9: Martin Cabeza, Nicolas - Leiva, Gianmarco | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| Apr 4, 2026 | Leiva | 1–0 | Fernandez Cano | Round 8: Leiva, Gianmarco - Fernandez Cano, Victor | French Defense: Winawer Variation, Advance Variation, with h4 | |
| Apr 4, 2026 | Solodovnichenko | 1–0 | Leiva | Round 7: Solodovnichenko, Yuri - Leiva, Gianmarco | Sicilian Defense: Moscow Variation, Main Line | |
| Apr 3, 2026 | Leiva | ½–½ | Almeida Quintana | Round 6: Leiva, Gianmarco - Almeida Quintana, Omar | Pirc Defense: Austrian Attack, Weiss Variation | |
| Apr 2, 2026 | Li | 1–0 | Leiva | Round 5: Li, Di - Leiva, Gianmarco | King's Indian Attack: Keres Variation | |
| Apr 1, 2026 | Ilinca | 0–1 | Leiva | Round 4: Ilinca, Felix-Antonio - Leiva, Gianmarco | Nimzo-Indian Defense: Sämisch Variation | |
| Apr 1, 2026 | Fernandez Seco | 0–1 | Leiva | Round 2: Fernandez Seco, Julian - Leiva, Gianmarco | Sicilian Defense: Closed | |
| Apr 1, 2026 | Leiva | 1–0 | Gonzalez Manchon | Round 3: Leiva, Gianmarco - Gonzalez Manchon, Juan Miguel | French Defense: Rubinstein Variation, Blackburne Defense | |
| Mar 31, 2026 | Leiva | * | Garcia Galeote | Round 1: Leiva, Gianmarco - Garcia Galeote, Lorenzo | ? | |
| Feb 20, 2026 | Martel Bruniaux | 0–1 | Leiva | Open Pamplona 26 | Queen's Indian Defense: Fianchetto Variation, Kramnik Variation | |
| Feb 18, 2026 | Leiva | 1–0 | Gonzalez Pabollet | Open Pamplona 26 | Sicilian Defense: Najdorf Variation | |
| Feb 18, 2026 | Zapata Campos | ½–½ | Leiva | Open Pamplona 26 | Nimzo-Indian Defense: St. Petersburg Variation | |
| Feb 18, 2026 | Leiva | 0–1 | Becerra | Open Pamplona 26 | Ruy Lopez: Berlin Defense, Anti-Berlin Variation | |
| Feb 17, 2026 | Merino Olaverri | 0–1 | Leiva | Open Pamplona 26 | Indian Defense: Accelerated London System | |
| Feb 17, 2026 | Leiva | 0–1 | Albornoz Cabrera | Open Pamplona 26 | Sicilian Defense: Moscow Variation, Main Line | |
| Feb 16, 2026 | Pedchenko Bondar | 0–1 | Leiva | Open Pamplona 26 | Sicilian Defense: Modern Variations | |
| Feb 15, 2026 | Leiva | 1–0 | Garcia Amelibia | Open Pamplona 26 | King's Indian Attack, with e6 | |
| Feb 14, 2026 | Barcelo Melnyk | ½–½ | Leiva | Open Pamplona 26 | Caro-Kann Defense: Classical Variation, Main Line | |
| Jan 6, 2026 | Leiva | 0–1 | Raja Rithvik R | Open de Roquetas 2026 | English Opening: Agincourt Defense | |
| Jan 5, 2026 | Gloeckler | 1–0 | Leiva | Open de Roquetas 2026 | Sicilian Defense | |
| Jan 4, 2026 | Leiva | 1–0 | Cukrowski | Open de Roquetas 2026 | Sicilian Defense: Godiva Variation | |
| Jan 4, 2026 | Prraneeth Vuppala | 1–0 | Leiva | Open de Roquetas 2026 | Italian Game: Giuoco Pianissimo, Normal | |
| Jan 3, 2026 | Leiva | 1–0 | Fiorito | Open de Roquetas 2026 | Queen's Gambit Declined | |
| Jan 3, 2026 | Deusa Ballesteros | 0–1 | Leiva | Open de Roquetas 2026 | Bogo-Indian Defense: Retreat Variation | |
| Dec 20, 2025 | Decuigniere | 1–0 | Leiva | Sunway Sitges 2025 | Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation | |
| Dec 20, 2025 | Leiva | ½–½ | Sandoval Mercado | Sunway Sitges 2025 | King's Indian Defense: Fianchetto Variation, Classical Variation | |
| Jul 24, 2025 | Perez Fungueiro | 1–0 | Leiva | XIII Torneo Internacional Cidade de Pontevedra | English Opening | |
| Jun 28, 2025 | Sifuentes Alcantara | 1–0 | Leiva | Ronda 3: Sifuentes Alcantara, Jhony Sebas - Leiva, Gianmarco | English Opening: King's English Variation | |
| Feb 16, 2025 | Leiva | ½–½ | Flynn | 2025 Champions Chess Tour Chessable Masters Qualifier | Ruy Lopez: Closed, Pilnik Variation | |
| Feb 16, 2025 | Leiva | 0–1 | Suyarov | 2025 Champions Chess Tour Chessable Masters Qualifier | French Defense: Winawer Variation, Advance Variation | |
| Feb 16, 2025 | Leiva | 0–1 | Namitbir Singh Walia | 2025 Champions Chess Tour Chessable Masters Qualifier | Ruy Lopez: Closed, Martinez Variation | |
| Feb 16, 2025 | Leiva | 0–1 | Nitish Belurkar | 2025 Champions Chess Tour Chessable Masters Qualifier | Scandinavian Defense: Portuguese Gambit, Classical Variation | |
| Feb 16, 2025 | Ozcan | 0–1 | Leiva | 2025 Champions Chess Tour Chessable Masters Qualifier | Nimzo-Indian Defense: Normal Variation | |
| Feb 16, 2025 | Oksendal | 0–1 | Leiva | 2025 Champions Chess Tour Chessable Masters Qualifier | Sicilian Defense: Alapin Variation | |
| Feb 16, 2025 | Zhauynbay Aldiyar | 0–1 | Leiva | 2025 Champions Chess Tour Chessable Masters Qualifier | Indian Defense: Anti-Nimzo-Indian | |
| Oct 1, 2024 | Henriquez Villagra | 1–0 | Leiva | IBEROAMERICANO | King's Indian Attack: Keres Variation | |
| Sep 30, 2024 | Goncalves | 0–1 | Leiva | IBEROAMERICANO | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Sep 29, 2024 | Leiva | 1–0 | Ruiz Buendia | IBEROAMERICANO | Italian Game: Giuoco Pianissimo, Normal | |
| Sep 28, 2024 | Noboa Silva | ½–½ | Leiva | IBEROAMERICANO | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Sep 27, 2024 | Leiva | 0–1 | Pichot | IBEROAMERICANO | Italian Game: Giuoco Pianissimo, Normal | |
| Sep 27, 2024 | Rocha | 0–1 | Leiva | IBEROAMERICANO | Ruy Lopez: Morphy Defense, Mackenzie Variation | |
| Sep 26, 2024 | Leiva | 0–1 | Salinas Herrera | IBEROAMERICANO | Italian Game: Giuoco Piano | |
| Sep 25, 2024 | Leiva | 1–0 | Castillo Beitia | IBEROAMERICANO | Sicilian Defense: Dragon Variation, Yugoslav Attack, Czerniak Variation | |
| Sep 25, 2024 | Masague Artero | 0–1 | Leiva | IBEROAMERICANO | King's Indian Attack: Sicilian Variation | |
| Sep 22, 2024 | Kozusek | ½–½ | Leiva | 45th FIDE Chess Olympiad | Semi-Slav Defense | |
| Sep 21, 2024 | Lodici | 1–0 | Leiva | 45th FIDE Chess Olympiad | Bogo-Indian Defense: Retreat Variation | |
| Sep 20, 2024 | Leiva | ½–½ | Noboa Silva | 45th FIDE Chess Olympiad | French Defense: Rubinstein Variation, Blackburne Defense | |
| Sep 15, 2024 | Erfan Mohamad Firdaus | 0–1 | Leiva | 45th FIDE Chess Olympiad | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Sep 14, 2024 | Leiva | 0–1 | Ahn | 45th FIDE Chess Olympiad | Sicilian Defense: Four Knights Variation | |
| Sep 13, 2024 | Chavez | ½–½ | Leiva | 45th FIDE Chess Olympiad | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Sep 12, 2024 | Leiva | 0–1 | Sjugirov | 45th FIDE Chess Olympiad | Sicilian Defense: French Variation | |
| Jul 29, 2024 | Parra Gonzales | 0–1 | Leiva | Round 2: Parra Gonzales, Andre Leonardo - Leiva, Gianmarco | Sicilian Defense: Najdorf Variation | |
| Jul 29, 2024 | Leiva | 1–0 | Bedoya Rosales | Round 1: Leiva, Gianmarco - Bedoya Rosales, Luis | Sicilian Defense: Moscow Variation, Main Line | |
| Jul 12, 2024 | Leiva | 0–1 | Vasquez Vargas | Round 11: Leiva, Gianmarco - Vasquez Vargas, Henry Richard | ? | |
| Jul 11, 2024 | Ccerhuayo Escobedo | ½–½ | Leiva | Round 9: Ccerhuayo Escobedo, Mels Leopold - Leiva, Gianmarco | English Opening: Symmetrical Variation, Anti-Benoni Variation, Geller Variation | |
| Jul 10, 2024 | Leiva | 1–0 | Flores Quillas | Round 8: Leiva, Gianmarco - Flores Quillas, Diego Saul Rodri | Zukertort Opening: Sicilian Invitation | |
| Jul 9, 2024 | Delgado Romero | 1–0 | Leiva | Round 7: Delgado Romero, Marco - Leiva, Gianmarco | Benoni Defense | |
| Jul 9, 2024 | Leiva | 1–0 | Garay Ramirez | Round 6: Leiva, Gianmarco - Garay Ramirez, Estefano Javier | English Opening: Anglo-Indian Defense, Slav Formation | |
| Jul 8, 2024 | Sanchez Negreiros | 0–1 | Leiva | Round 5: Sanchez Negreiros, Jose Alberto - Leiva, Gianmarco | Trompowsky Attack | |
| Jul 8, 2024 | Leiva | ½–½ | Terry | Round 4: Leiva, Gianmarco - Terry, Renato | Ruy Lopez: Open Berlin Defense, l'Hermet Variation | |
| Jul 7, 2024 | Parra Gonzales | 0–1 | Leiva | Round 3: Parra Gonzales, Andre Leonardo - Leiva, Gianmarco | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jul 6, 2024 | Leiva | ½–½ | Fernandez Sanchez | Round 2: Leiva, Gianmarco - Fernandez Sanchez, Fernando Miguel | King's Indian Attack | |
| Jul 6, 2024 | Principe | 0–1 | Leiva | Round 1: Principe, Gerson - Leiva, Gianmarco | Torre Attack: Classical Defense, Nimzowitsch Variation | |
| Jul 6, 2024 | Espinoza Pacheco | * | Leiva | Round 10: Espinoza Pacheco, Aldryn Leo - Leiva, Gianmarco | Queen's Gambit Declined: Three Knights Variation | |
| Jun 2, 2024 | Valderrama Quiceno | 1–0 | Leiva | Round 9: Valderrama Quiceno, Esteban Alb - Leiva, Gianmarco | King's Indian Attack: Yugoslav Variation | |
| Jun 2, 2024 | Carrillo Parra | 0–1 | Leiva | Round 7: Carrillo Parra, Miguel Alfredo - Leiva, Gianmarco | Nimzo-Indian Defense: Classical Variation | |
| Jun 2, 2024 | Leiva | ½–½ | Krysa | Round 8: Leiva, Gianmarco - Krysa, Leandro | King's Indian Attack | |
| Jun 2, 2024 | Leiva | 1–0 | Delgado Romero | Round 6: Leiva, Gianmarco - Delgado Romero, Marco | Pirc Defense: Classical Variation, Quiet System, Czech Defense | |
| Jun 1, 2024 | Gallego | 0–1 | Leiva | Round 5: Gallego, Julian Andres - Leiva, Gianmarco | Queen's Gambit Declined: Three Knights Variation | |
| Jun 1, 2024 | Leiva | 1–0 | Univio Sanchez | Round 4: Leiva, Gianmarco - Univio Sanchez, German | Sicilian Defense: Moscow Variation, Main Line | |
| Jun 1, 2024 | Valle | ½–½ | Leiva | Round 3: Valle, Efrain - Leiva, Gianmarco | King's Indian Attack: Yugoslav Variation | |
| Jun 1, 2024 | Leiva | 1–0 | Ventura Rosario | Round 2: Leiva, Gianmarco - Ventura Rosario, Julio Esdeulin | King's Indian Attack: Symmetrical Defense | |
| Jun 1, 2024 | Zapata | 0–1 | Leiva | Round 1: Zapata, Olga Maria - Leiva, Gianmarco | Indian Defense: Anti-Nimzo-Indian | |
| May 30, 2024 | Leiva | 1–0 | Caballero Marrugo | Round 9: Leiva, Gianmarco - Caballero Marrugo, David Jose | Zukertort Opening: Pirc Invitation | |
| May 30, 2024 | Corrales Jimenez | 1–0 | Leiva | Round 8: Corrales Jimenez, Fidel - Leiva, Gianmarco | Queen's Gambit Declined: Three Knights Variation | |
| May 30, 2024 | Leiva | 1–0 | Vargas | Round 7: Leiva, Gianmarco - Vargas, Gabriela | King's Indian Attack | |
| May 30, 2024 | Garnier | 0–1 | Leiva | Round 6: Garnier, Rene - Leiva, Gianmarco | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| May 30, 2024 | Leiva | 1–0 | Otalora Pacheco | Round 5: Leiva, Gianmarco - Otalora Pacheco, Carlos Eduardo | Catalan Opening: Open Defense, Classical Line | |
| May 30, 2024 | Noboa Silva | 1–0 | Leiva | Round 4: Noboa Silva, Kevin - Leiva, Gianmarco | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| May 30, 2024 | Leiva | 1–0 | Arango | Round 3: Leiva, Gianmarco - Arango, Andres Mauricio | Zukertort Opening: Reversed Grünfeld | |
| May 30, 2024 | Ayala Delgado | 0–1 | Leiva | Round 2: Ayala Delgado, Sergio Alejandro - Leiva, Gianmarco | Sicilian Defense: Alapin Variation | |
| May 29, 2024 | Leiva | 1–0 | Jimenez Salas | Round 1: Leiva, Gianmarco - Jimenez Salas, Maria Teresa | King's Indian Attack | |
| Mar 15, 2024 | Leiva | 1–0 | Fernandez | Round 10: Leiva, Gianmarco - Fernandez, Fernando | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Mar 15, 2024 | Vivas Zamora | 0–1 | Leiva | Round 9: Vivas Zamora, Fabian Ernesto - Leiva, Gianmarco | Sicilian Defense: Najdorf Variation | |