| Jun 28, 2026 | Chavez | 1–0 | Sandoval | Round 8: Chavez, Ricardo Ernesto - Sandoval, Mario | Owen Defense | |
| Jun 27, 2026 | Sandoval | 1–0 | Ayala | Round 7: Sandoval, Mario - Ayala, Rolando | Nimzo-Larsen Attack: English Variation | |
| Jun 22, 2026 | Juan Carlos Mijango Mendoza | 0–1 | Sandoval | Round 6: Juan Carlos Mijango Mendoza - Sandoval, Mario | Italian Game: Giuoco Pianissimo, Normal | |
| Jun 20, 2026 | Sandoval | ½–½ | Coto Anaya | Round 5: Sandoval, Mario - Coto Anaya, Walter Alexander | Nimzo-Larsen Attack: Modern Variation | |
| Jun 14, 2026 | Escobar Flamenco | 1–0 | Sandoval | Round 4: Escobar Flamenco, Kilmar Ademir - Sandoval, Mario | Owen Defense | |
| Jun 13, 2026 | Sandoval | 1–0 | Ibarra | Round 3: Sandoval, Mario - Ibarra, Katherine | Nimzo-Larsen Attack: Modern Variation | |
| Sep 21, 2025 | Monge | 1–0 | Sandoval | Ronda 9: Monge, Rafael - Sandoval, Mario | Indian Defense: Budapest Defense, Adler Variation | |
| Sep 20, 2025 | Sandoval | 0–1 | Franco | Ronda 8: Sandoval, Mario - Franco, Jorge | Queen's Pawn Game: London System | |
| Sep 13, 2025 | Sandoval | 0–1 | Velasquez | Ronda 7: Sandoval, Mario - Velasquez, Jose Eduardo | Mikenas Defense: Lithuanian Variation | |
| Sep 7, 2025 | Moreno Guillermo | 1–0 | Sandoval | Ronda 6: Moreno Guillermo - Sandoval, Mario | Four Knights Game: Spanish Variation | |
| Sep 6, 2025 | Tobar | 1–0 | Sandoval | Ronda 5: Tobar, Jorge - Sandoval, Mario | French Defense: Steiner Variation | |
| Sep 1, 2025 | Sandoval | 0–1 | Escobar Flamenco | Ronda 3: Sandoval, Mario - Escobar Flamenco, Kilmar Ademir | Sicilian Defense: Smith-Morra Gambit Accepted, Scheveningen Formation | |
| Sep 1, 2025 | Sandoval | 0–1 | Navarrete | Ronda 2: Sandoval, Mario - Navarrete, Guillermo | Caro-Kann Defense: Campomanes Attack | |
| Aug 23, 2025 | Melendez | 1–0 | Sandoval | Campeonato Nacional de Primera Categoría 2025 | ? | |
