| 25 ago 2026 | Oliveira, Silvio Eduardo 2272 | Gonzalez Parejo, Ramon Junior 2252 | 0-1 | B00 Defensa Nimzowitsch: Scandinavian Variation, Advance Variation | Pan American Amateur Chess Championship 2026 | Open | U2300 | 43 | Ver |
| 24 ago 2026 | Oliveira, Silvio Eduardo 2272 | Chinchilla, Alejandro Jose 2174 | 1-0 | C65 Apertura Española (Ruy López): Berlin Defense, Anti-Berlin Variation | Pan American Amateur Chess Championship 2026 | Open | U2300 | 39 | Ver |
| 22 ago 2026 | Narvaez Ramirez, Faber Alberto 2085 | Oliveira, Silvio Eduardo 2272 | 1-0 | D43 Defensa Semieslava: Anti-Moscow Gambit | Pan American Amateur Chess Championship 2026 | Open | U2300 | 35 | Ver |
| 22 ago 2026 | Oliveira, Silvio Eduardo 2272 | Bieging, Luca Jurgen 2105 | ½-½ | B23 Defensa Siciliana: Closed, Traditional | Pan American Amateur Chess Championship 2026 | Open | U2300 | 49 | Ver |
| 22 ago 2026 | Cruz, Natan Gomes 2018 | Oliveira, Silvio Eduardo 2272 | 0-1 | C47 Apertura de los Cuatro Caballos | Pan American Amateur Chess Championship 2026 | Open | U2300 | 38 | Ver |
| 23 may 2026 | Oliveira, Silvio Eduardo 2331 | De Rossi, Pedro Donizeti 2099 | ½-½ | C46 Apertura de los Tres Caballos: Steinitz-Rosenthal Variation | IV IRT de Xadrez Rápido Beeoz Sports | 56 | Ver |
| 23 may 2026 | Clemente, Luiz Eduardo Lemes 2015 | Oliveira, Silvio Eduardo 2331 | 0-1 | C04 Defensa Francesa: Tarrasch Variation, Guimard Defense, Main Line | IV IRT de Xadrez Rápido Beeoz Sports | 44 | Ver |
| 1 feb 2026 | Saiz Rodriguez, Daniel Evelio 2229 | Oliveira, Silvio Eduardo 2300 | 1-0 | A07 King's Indian Attack, with e6 | III Sampa Chess Open - BLZ | 25 | Ver |
| 1 feb 2026 | Oliveira, Silvio Eduardo 2300 | Jorge, Marcos Guilherme Monteiro 2101 | ½-½ | D77 Defensa Neogrünfeld: Classical Variation, Modern Defense | III Sampa Chess Open - BLZ | 61 | Ver |
| 1 feb 2026 | Miquelin, Nicolas Seoane 2307 | Oliveira, Silvio Eduardo 2300 | 1-0 | B12 Defensa Caro-Kann: Advance Variation, Tal Variation | III Sampa Chess Open - BLZ | 33 | Ver |
| 1 feb 2026 | Oliveira, Silvio Eduardo 2300 | De Carvalho, Vitor Augusto Ponciano 2115 | 1-0 | A05 Ataque Indio de Rey: Symmetrical Defense | III Sampa Chess Open - BLZ | 46 | Ver |
| 1 feb 2026 | Ticona Rocabado, Licael Roderick 2440 | Oliveira, Silvio Eduardo 2300 | 1-0 | A07 King's Indian Attack, with e6 | III Sampa Chess Open - BLZ | 29 | Ver |
| 31 ene 2026 | Pironti, Francisco Ferrari 2231 | Oliveira, Silvio Eduardo 2305 | ½-½ | A07 King's Indian Attack, with e6 | III Sampa Chess Open - RPD | 7 | Ver |
| 31 ene 2026 | Pinero Rodriguez, Carlos Jose 2180 | Oliveira, Silvio Eduardo 2305 | 0-1 | B10 Defensa Caro-Kann: Apocalypse Attack | III Sampa Chess Open - RPD | 30 | Ver |
| 30 ene 2026 | De Souza, Regis Gabetta 2103 | Oliveira, Silvio Eduardo 2305 | 0-1 | D01 Rapport-Jobava System | III Sampa Chess Open - RPD | 27 | Ver |
| 27 ene 2026 | Oliveira, Silvio Eduardo 2305 | Ticona Rocabado, Licael Roderick 2382 | ½-½ | C03 Defensa Francesa: Tarrasch Variation | III Sampa Chess Open - RPD | 34 | Ver |