| Jun 27, 2026 | Guevara Ruiz | 1–0 | Garcia | Round 7: Guevara Ruiz, Marvin Andres - Garcia, Angie | Italian Game: Classical Variation, Giuoco Pianissimo, with h6 | |
| Jun 22, 2026 | Fang Juan | 0–1 | Guevara Ruiz | Round 6: Fang Juan - Guevara Ruiz, Marvin Andres | Sicilian Defense: Kalashnikov Variation | |
| Jun 20, 2026 | Zabdiel Neftaly Torres Perez | 0–1 | Guevara Ruiz | Round 5: Zabdiel Neftaly Torres Perez - Guevara Ruiz, Marvin Andres | Queen's Gambit Accepted: Classical Defense, Rubinstein Variation | |
| Jun 14, 2026 | Guevara Ruiz | 1–0 | Rivera Mario Alfredo | Round 4: Guevara Ruiz, Marvin Andres - Rivera Mario Alfredo | French Defense: Rubinstein Variation | |
| Jun 13, 2026 | Olivar Molina | 0–1 | Guevara Ruiz | Round 2: Olivar Molina, Francisco David - Guevara Ruiz, Marvin Andres | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jun 13, 2026 | Guevara Ruiz | 0–1 | Mendez | Round 3: Guevara Ruiz, Marvin Andres - Mendez, Dimas | Modern Defense: Standard Defense | |
| Jun 13, 2026 | Guevara Sanchez | 1–0 | Guevara Ruiz | Round 8: Guevara Sanchez, Erick Marvin - Guevara Ruiz, Marvin Andres | Rat Defense: Harmonist | |
| May 16, 2026 | Wang | 1–0 | Guevara Ruiz | Round 8: Wang, Nathan Zian - Guevara Ruiz, Marvin Andres | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| May 16, 2026 | Reyes Zavaleta | 1–0 | Guevara Ruiz | Round 7: Reyes Zavaleta, Cristhian Yamil - Guevara Ruiz, Marvin Andres | Catalan Opening: Closed | |
| May 15, 2026 | Guevara Ruiz | 1–0 | Ramos Rodriguez | Round 6: Guevara Ruiz, Marvin Andres - Ramos Rodriguez, Daniel | French Defense: Hecht-Reefschläger Variation | |
| May 14, 2026 | Ibarra Carlos Roberto | ½–½ | Guevara Ruiz | Round 5: Ibarra Carlos Roberto - Guevara Ruiz, Marvin Andres | Indian Defense | |
| May 14, 2026 | Guevara Ruiz | 1–0 | Montilla Rodriguez | Round 4: Guevara Ruiz, Marvin Andres - Montilla Rodriguez, Camilo | Caro-Kann Defense: Advance Variation | |
| May 13, 2026 | Levano Loayza | ½–½ | Guevara Ruiz | Round 3: Levano Loayza, Adriano Jaffet - Guevara Ruiz, Marvin Andres | Sicilian Defense: Taimanov Variation | |
| Apr 2, 2026 | Guevara Ruiz | 1–0 | Miranda Flores | Campeonato Centroamericano y del Caribe SUB 20 2026 | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Apr 1, 2026 | Ulloa Jimenez | ½–½ | Guevara Ruiz | Campeonato Centroamericano y del Caribe SUB 20 2026 | Sicilian Defense: Closed | |
| Apr 1, 2026 | Guevara Ruiz | ½–½ | Cardoza Diaz | Campeonato Centroamericano y del Caribe SUB 20 2026 | King's Indian Defense: Makogonov Variation | |
| Mar 31, 2026 | Mendez Machado | 1–0 | Guevara Ruiz | Campeonato Centroamericano y del Caribe SUB 20 2026 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Mar 30, 2026 | Guevara Ruiz | ½–½ | Lizano Quiros | Campeonato Centroamericano y del Caribe SUB 20 2026 | Caro-Kann Defense: Advance Variation | |
| Mar 29, 2026 | Guevara Ruiz | ½–½ | Vargas Arguedas | Campeonato Centroamericano y del Caribe SUB 20 2026 | Sicilian Defense: Classical Variation | |
| Mar 28, 2026 | Leon Infante | ½–½ | Guevara Ruiz | Campeonato Centroamericano y del Caribe SUB 20 2026 | Indian Defense: Accelerated London System | |
| Mar 28, 2026 | Guevara Ruiz | 1–0 | Castillo Mendez | Campeonato Centroamericano y del Caribe SUB 20 2026 | Caro-Kann Defense: Exchange Variation | |
| Mar 1, 2026 | Guevara Ruiz | 1–0 | Romero | Round 9: Guevara Ruiz, Marvin Andres - Romero, Wilbert | French Defense: Paulsen Variation | |
| Feb 28, 2026 | Arabia | 0–1 | Guevara Ruiz | Round 8: Arabia, Carlos - Guevara Ruiz, Marvin Andres | Zukertort Opening: Sicilian Invitation | |
| Feb 22, 2026 | Guevara Ruiz | 0–1 | Pacheco | Round 7: Guevara Ruiz, Marvin Andres - Pacheco, Julio | French Defense: McCutcheon Variation, Lasker Variation | |
| Feb 21, 2026 | Velasquez | 0–1 | Guevara Ruiz | Round 6: Velasquez, Jose Eduardo - Guevara Ruiz, Marvin Andres | Sicilian Defense: Grand Prix Attack | |
| Feb 14, 2026 | Guevara Ruiz | 1–0 | Alvarenga | Round 5: Guevara Ruiz, Marvin Andres - Alvarenga, Juan | French Defense: Rubinstein Variation, Fort Knox Variation | |
| Feb 8, 2026 | Tobar | 1–0 | Guevara Ruiz | Round 4: Tobar, Jorge - Guevara Ruiz, Marvin Andres | French Defense: Steiner Variation | |
| Feb 7, 2026 | Nerio | 0–1 | Guevara Ruiz | Round 2: Nerio, Carlos Salvador - Guevara Ruiz, Marvin Andres | Sicilian Defense: Smith-Morra Gambit Accepted, Kan Formation | |
| Feb 7, 2026 | Guevara Ruiz | 1–0 | Escobar Flamenco | Round 3: Guevara Ruiz, Marvin Andres - Escobar Flamenco, Kilmar Ademir | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| Jan 11, 2026 | Guevara Ruiz | ½–½ | Ordonez Bonilla | Tercer Torneo Internacional Club Caissa Guatemala | Bogo-Indian Defense: Retreat Variation | |
| Jan 10, 2026 | Guevara Ruiz | 0–1 | Kaufman | Tercer Torneo Internacional Club Caissa Guatemala | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Jan 9, 2026 | Guevara Ruiz | ½–½ | Sanchez Alvarez | Tercer Torneo Internacional Club Caissa Guatemala | Sicilian Defense: Classical Variation | |
| Jan 7, 2026 | Guevara Ruiz | 0–1 | Gonzalez Vidal | Tercer Torneo Internacional Club Caissa Guatemala | Catalan Opening: Closed | |
| Dec 9, 2025 | Guevara Ruiz | 1–0 | Orr | Round 1: Guevara Ruiz, Marvin Andres - Orr, Michael E. | King's Pawn Game | |
| Dec 9, 2025 | Guevara Ruiz | 1–0 | Pedrosa Rivera | Round 3: Guevara Ruiz, Marvin Andres - Pedrosa Rivera, Joshua | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Dec 9, 2025 | Guevara Ruiz | 1–0 | Samuel Bisnath | Round 4: Guevara Ruiz, Marvin Andres - Samuel Bisnath, Kael | Richter-Veresov Attack: Richter Variation | |
| Dec 9, 2025 | Guevara Ruiz | 0–1 | Ramirez | Round 6: Guevara Ruiz, Marvin Andres - Ramirez, Daniel | Sicilian Defense: Najdorf Variation, Opocensky Variation, Modern Line | |
| Dec 9, 2025 | Guevara Ruiz | ½–½ | Bedi | Round 9: Guevara Ruiz, Marvin Andres - Bedi, Vaibhav | Sicilian Defense: Old Sicilian | |
| Dec 9, 2025 | Reynoso Almonte | 0–1 | Guevara Ruiz | Round 2: Reynoso Almonte, Emir - Guevara Ruiz, Marvin Andres | Rapport-Jobava System | |
| Dec 9, 2025 | Clarke | 0–1 | Guevara Ruiz | Round 5: Clarke, Noah - Guevara Ruiz, Marvin Andres | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Dec 9, 2025 | Harvey | ½–½ | Guevara Ruiz | Round 7: Harvey, Corbin - Guevara Ruiz, Marvin Andres | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| Dec 9, 2025 | Sinckler | ½–½ | Guevara Ruiz | Round 8: Sinckler, Mileke - Guevara Ruiz, Marvin Andres | Catalan Opening | |
| Nov 6, 2025 | Guevara Ruiz | ½–½ | Vergara Rivera | Round 6: Guevara Ruiz, Marvin Andres - Vergara Rivera, Juan Sebastiaan | Sicilian Defense: Kalashnikov Variation | |
| Nov 5, 2025 | Delgado Caballero | ½–½ | Guevara Ruiz | Round 5: Delgado Caballero, Nigel Alejandro - Guevara Ruiz, Marvin Andres | King's Indian Attack | |
| Nov 5, 2025 | Miranda Samudio | 1–0 | Guevara Ruiz | Round 4: Miranda Samudio, Adrian Jafeth - Guevara Ruiz, Marvin Andres | Sicilian Defense: Old Sicilian | |
| Nov 5, 2025 | Arauz Espinoza | 1–0 | Guevara Ruiz | Round 3: Arauz Espinoza, Douglas Ariel - Guevara Ruiz, Marvin Andres | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 5, 2025 | Allen Leydenz | 1–0 | Guevara Ruiz | Round 2: Allen Leydenz, Christian Gabriel - Guevara Ruiz, Marvin Andres | Sicilian Defense: Snyder Variation | |
| Nov 5, 2025 | Guevara Ruiz | 1–0 | Ordonez Canales | Round 1: Guevara Ruiz, Marvin Andres - Ordonez Canales, Josue Fernando | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Nov 5, 2025 | Guevara Ruiz | 0–1 | Colmenarez Rivero | Round 6: Guevara Ruiz, Marvin Andres - Colmenarez Rivero, Jheremias David | French Defense: Classical Variation, Burn Variation | |
| Nov 5, 2025 | Lopez Murillo | 0–1 | Guevara Ruiz | Round 4: Lopez Murillo, Eliseo Josue - Guevara Ruiz, Marvin Andres | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 5, 2025 | Briceno Campos | 1–0 | Guevara Ruiz | Round 2: Briceno Campos, Angel Gabriel - Guevara Ruiz, Marvin Andres | Sicilian Defense: Old Sicilian | |
| Nov 5, 2025 | Guevara Ruiz | 0–1 | Delgado Caballero | Round 1: Guevara Ruiz, Marvin Andres - Delgado Caballero, Nigel Alejandro | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Nov 4, 2025 | Delgado Caballero | 1–0 | Guevara Ruiz | Round 6: Delgado Caballero, Nigel Alejandro - Guevara Ruiz, Marvin Andres | English Opening: Neo-Catalan | |
| Nov 4, 2025 | Guevara Ruiz | 0–1 | Espinoza Guerrero | Round 5: Guevara Ruiz, Marvin Andres - Espinoza Guerrero, Felix Alberto | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Nov 3, 2025 | Colmenarez Rivero | 0–1 | Guevara Ruiz | Round 4: Colmenarez Rivero, Jheremias David - Guevara Ruiz, Marvin Andres | Catalan Opening: Open Defense, Classical Line | |
| Nov 3, 2025 | Guevara Ruiz | 0–1 | Monroy Lopez | Round 3: Guevara Ruiz, Marvin Andres - Monroy Lopez, Gustavo Adolfo | Sicilian Defense: Löwenthal Variation | |
| Nov 2, 2025 | Guevara Ruiz | ½–½ | Orocio Mendoza | Round 1: Guevara Ruiz, Marvin Andres - Orocio Mendoza, Egbert David | French Defense: Classical Variation, Burn Variation | |
| Nov 2, 2025 | Polak | 0–1 | Guevara Ruiz | Round 2: Polak, Delgion T. J. - Guevara Ruiz, Marvin Andres | Indian Defense: Spielmann-Indian | |
| Jul 26, 2025 | Guevara Ruiz | ½–½ | Bazan Romero | Round 3: Guevara Ruiz, Marvin Andres - Bazan Romero, Octavio Aaron | Catalan Opening: Open Defense, Classical Line | |
| Apr 14, 2025 | Guevara Ruiz | 0–1 | Duran Vega | Round 2: Guevara Ruiz, Marvin Andres - Duran Vega, Sergio | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Sep 22, 2024 | Marjanovic | 1–0 | Guevara Ruiz | 45th FIDE Chess Olympiad | Sicilian Defense: Closed, Traditional | |
| Sep 20, 2024 | Jaramillo Lopez | 1–0 | Guevara Ruiz | 45th FIDE Chess Olympiad | English Opening: Agincourt Defense | |
| Sep 19, 2024 | Al-Kuwari | 0–1 | Guevara Ruiz | 45th FIDE Chess Olympiad | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Sep 18, 2024 | Guevara Ruiz | 0–1 | Khayat | 45th FIDE Chess Olympiad | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Sep 16, 2024 | Depradine | 0–1 | Guevara Ruiz | 45th FIDE Chess Olympiad | Tarrasch Defense: Symmetrical Variation | |
| Sep 15, 2024 | Guevara Ruiz | 0–1 | Zlatkov | 45th FIDE Chess Olympiad | Sicilian Defense: Four Knights Variation | |
| Sep 14, 2024 | Hovhannisyan | 1–0 | Guevara Ruiz | 45th FIDE Chess Olympiad | Tarrasch Defense: Two Knights Variation | |
| Sep 12, 2024 | Guevara Ruiz | 1–0 | Piva | 45th FIDE Chess Olympiad | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Aug 6, 2021 | Guevara Ruiz | ½–½ | Wang | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Smith-Morra Gambit Accepted | |
| Aug 6, 2021 | Guevara Ruiz | 0–1 | Lanzilotta | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Smith-Morra Gambit Accepted, Scheveningen Formation | |
| Aug 6, 2021 | Guevara Ruiz | 0–1 | Tejerina Lazarte | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Aug 6, 2021 | Guevara Ruiz | 1–0 | Sinton | World Youth Cup 2021 O12-G16 - Open 12 | Italian Game: Giuoco Piano | |
| Aug 6, 2021 | Guevara Ruiz | 0–1 | Tushishvili | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Smith-Morra Gambit Accepted, Paulsen Formation | |
| Aug 6, 2021 | Akhmedov | 1–0 | Guevara Ruiz | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Old Sicilian | |
| Aug 6, 2021 | Linares Orellana | 0–1 | Guevara Ruiz | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Scheveningen Variation, Classical Variation | |
| Aug 6, 2021 | Liu | 1–0 | Guevara Ruiz | World Youth Cup 2021 O12-G16 - Open 12 | Slav Defense: Geller Gambit | |
| Aug 6, 2021 | Samuel Bisnath | 0–1 | Guevara Ruiz | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Lasker-Pelikan Variation, Schlechter Variation | |
| Aug 6, 2021 | Kote | ½–½ | Guevara Ruiz | World Youth Cup 2021 O12-G16 - Open 12 | Sicilian Defense: Lasker-Pelikan Variation, Retreat Variation | |
| — | Guevara Ruiz | 1–0 | Bedi | Round 3: Guevara Ruiz, Marvin Andres - Bedi, Vaibhav | Sicilian Defense: Four Knights Variation | |
| — | Guevara Ruiz | 0–1 | Herrera Jimenez | Round 5: Guevara Ruiz, Marvin Andres - Herrera Jimenez, Mateo | Italian Game: Classical Variation, Giuoco Pianissimo | |
| — | Guevara Ruiz | 0–1 | Garzon Espitia | Round 7: Guevara Ruiz, Marvin Andres - Garzon Espitia, Nicolas Alejandro | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| — | Guevara Ruiz | ½–½ | Casqui Lopez | Round 8: Guevara Ruiz, Marvin Andres - Casqui Lopez, Pamela Grace | Sicilian Defense: Four Knights Variation | |
| — | Vaz | 1–0 | Guevara Ruiz | Round 2: Vaz, Ethan - Guevara Ruiz, Marvin Andres | Sicilian Defense: Old Sicilian | |
| — | Tabatadze | 1–0 | Guevara Ruiz | Round 4: Tabatadze, Erekle - Guevara Ruiz, Marvin Andres | Queen's Indian Defense: Fianchetto Variation | |
| — | Ramirez Aguilar | 0–1 | Guevara Ruiz | Round 6: Ramirez Aguilar, Julian Jose - Guevara Ruiz, Marvin Andres | Sicilian Defense: Taimanov Variation, Normal Variation | |
| — | Huertas Cabrera | 0–1 | Guevara Ruiz | Round 1: Huertas Cabrera, Daniel - Guevara Ruiz, Marvin Andres | Nimzo-Larsen Attack: Indian Variation | |
| — | Gonzalez Bolivar | 1–0 | Guevara Ruiz | Round 9: Gonzalez Bolivar, Juan Jose - Guevara Ruiz, Marvin Andres | Sicilian Defense: Old Sicilian | |