| Dec 2, 2023 | Osvaldo Zambrana | 1–0 | Sandro Mareco | Round 9: Osvaldo Zambrana - Sandro Mareco | Italian Game: Giuoco Piano | |
| Dec 1, 2023 | Alex Antonio Delgado Rosas | 0–1 | Osvaldo Zambrana | Round 8: Alex Antonio Delgado Rosas - Osvaldo Zambrana | Queen's Pawn Game: London System | |
| Nov 30, 2023 | Osvaldo Zambrana | ½–½ | Gilberto Hernandez Guerrero | Round 7: Osvaldo Zambrana - Gilberto Hernandez Guerrero | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Nov 29, 2023 | Elier Miranda Mesa | ½–½ | Osvaldo Zambrana | Round 6: Elier Miranda Mesa - Osvaldo Zambrana | Sicilian Defense: Closed, Traditional | |
| Nov 29, 2023 | Osvaldo Zambrana | 1–0 | Anahi Ortiz Verdezoto | Round 5: Osvaldo Zambrana - Anahi Ortiz Verdezoto | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Nov 28, 2023 | Dylan Isidro Berdayes Ason | ½–½ | Osvaldo Zambrana | Round 4: Dylan Isidro Berdayes Ason - Osvaldo Zambrana | Queen's Gambit Declined: Queen's Knight Variation | |
| Nov 26, 2023 | Osvaldo Zambrana | 1–0 | David Alejandro Cabezas Solano | Round 3: Osvaldo Zambrana - David Alejandro Cabezas Solano | Sicilian Defense: Najdorf Variation | |
| Nov 25, 2023 | Jeigoth Pastor Carvajal | ½–½ | Osvaldo Zambrana | Round 1: Jeigoth Pastor Carvajal - Osvaldo Zambrana | Sicilian Defense: Closed, Traditional | |
| Sep 22, 2023 | Osvaldo Zambrana | ½–½ | Fabian Vivas Zamora | Round 9: Osvaldo Zambrana - Fabian Vivas Zamora | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Sep 21, 2023 | Sergio Barrientos | 0–1 | Osvaldo Zambrana | Round 8: Sergio Barrientos - Osvaldo Zambrana | Queen's Gambit Declined | |
| Sep 20, 2023 | Osvaldo Zambrana | 1–0 | Lucas Costamilan Tomiello | Round 7: Osvaldo Zambrana - Lucas Costamilan Tomiello | Sicilian Defense: Lasker-Pelikan Variation | |
| Sep 19, 2023 | Diego Flores Quillas | ½–½ | Osvaldo Zambrana | Round 6: Diego Flores Quillas - Osvaldo Zambrana | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Sep 18, 2023 | Osvaldo Zambrana | ½–½ | Jorge Cori | Round 5: Osvaldo Zambrana - Jorge Cori | Italian Game: Giuoco Piano | |
| Sep 17, 2023 | Fernando Fernandez | 0–1 | Osvaldo Zambrana | Round 4: Fernando Fernandez - Osvaldo Zambrana | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Sep 16, 2023 | Osvaldo Zambrana | ½–½ | Deivy Vera | I CAMPEONATO SUDAMERICANO ABSOLUTO 2023 | Italian Game: Giuoco Piano | |
| May 23, 2023 | Osvaldo Zambrana | 0–1 | Jorge Cori | Round 11: Osvaldo Zambrana - Jorge Cori | Italian Game: Classical Variation, Giuoco Pianissimo, with h6 | |
| May 22, 2023 | Fidel Corrales Jimenez | 1–0 | Osvaldo Zambrana | Round 10: Fidel Corrales Jimenez - Osvaldo Zambrana | Indian Defense: Normal Variation | |
| May 21, 2023 | Osvaldo Zambrana | 1–0 | Luis Paulo Supi | Round 9: Osvaldo Zambrana - Luis Paulo Supi | Sicilian Defense: Najdorf Variation | |
| May 21, 2023 | Osvaldo Zambrana | 1–0 | Sandro Mareco | Round 8: Osvaldo Zambrana - Sandro Mareco | Italian Game: Giuoco Pianissimo, Normal | |
| May 20, 2023 | David Daniel Camacho Campusano | 0–1 | Osvaldo Zambrana | Round 7: David Daniel Camacho Campusano - Osvaldo Zambrana | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Novosibirsk Variation | |
| May 19, 2023 | Osvaldo Zambrana | ½–½ | Luis Ernesto Quesada Perez | Round 6: Osvaldo Zambrana - Luis Ernesto Quesada Perez | Sicilian Defense: Dragon Variation, Yugoslav Attack, Modern Line | |
| May 17, 2023 | Osvaldo Zambrana | 0–1 | Carlos Daniel Albornoz Cabrera | Round 4: Osvaldo Zambrana - Carlos Daniel Albornoz Cabrera | Sicilian Defense: Najdorf Variation | |
| May 15, 2023 | Os Misael King Rodriguez | * | Osvaldo Zambrana | Round 1: Os Misael King Rodriguez - Osvaldo Zambrana | ? | |
| Apr 2, 2023 | Matias Carcamo | ½–½ | Osvaldo Zambrana | Round 3: Matias Carcamo - Osvaldo Zambrana | Sicilian Defense: Closed | |
| Apr 2, 2023 | Osvaldo Zambrana | 1–0 | Marzo Daniel Lucero | Round 2: Osvaldo Zambrana - Marzo Daniel Lucero | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Apr 1, 2023 | Damian Ferreyra | 0–1 | Osvaldo Zambrana | Round 1: Damian Ferreyra - Osvaldo Zambrana | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | |
| Oct 16, 2022 | Alexandr Fier | 1–0 | Osvaldo Zambrana | Round 7: Alexandr Fier - Osvaldo Zambrana | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Oct 16, 2022 | Osvaldo Zambrana | ½–½ | Jose Fernando Cuenca Jimenez | Round 6: Osvaldo Zambrana - Jose Fernando Cuenca Jimenez | Italian Game: Giuoco Piano | |
| Oct 15, 2022 | Osvaldo Zambrana | ½–½ | Neuris Delgado Ramirez | Round 4: Osvaldo Zambrana - Neuris Delgado Ramirez | Sicilian Defense: Kalashnikov Variation | |
