| 29 ago 2026 | Arias, Lemnys A. 2209 | Guevara Ruiz, Marvin Andres 2149 | 1-0 | C41 Defensa Philidor: Lion Variation | XII Torneo Internacional Feria Agostina 2026 | 52 | Ver |
| 29 ago 2026 | Guevara Ruiz, Marvin Andres 2149 | Guevara Sanchez, Erick Marvin 2067 | 1-0 | B53 Defensa Siciliana: Chekhover Variation | XII Torneo Internacional Feria Agostina 2026 | 72 | Ver |
| 29 ago 2026 | Guevara Ruiz, Santiago Jose 2121 | Guevara Ruiz, Marvin Andres 2149 | ½-½ | B10 Defensa Caro-Kann: Two Knights Attack | XII Torneo Internacional Feria Agostina 2026 | 27 | Ver |
| 7 ago 2026 | Patel, Maahir M 2192 | Guevara Ruiz, Marvin Andres 2149 | 1-0 | B42 Defensa Siciliana: Kan Variation, Modern Variation | Pan American U-20 Championship 2026 | Open | 43 | Ver |
| 6 ago 2026 | Guevara Ruiz, Marvin Andres 2149 | Huallpa Fernandez, Hector Manuel 2025 | ½-½ | B33 Defensa Siciliana: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | Pan American U-20 Championship 2026 | Open | 73 | Ver |
| 6 ago 2026 | Zacarias Rodriguez, Santiago 2208 | Guevara Ruiz, Marvin Andres 2149 | 1-0 | B00 Defensa Pirc | Pan American U-20 Championship 2026 | Open | 56 | Ver |
| 5 ago 2026 | Guevara Ruiz, Marvin Andres 2149 | Quesada Fallas, Esteban 2033 | 1-0 | B45 Defensa Siciliana: Four Knights Variation | Pan American U-20 Championship 2026 | Open | 40 | Ver |
| 27 jun 2026 | Guevara Ruiz, Marvin Andres 2149 | Garcia, Angie 2001 | 1-0 | C54 Apertura Italiana: Classical Variation, Giuoco Pianissimo, with h6 | Segundo Campeonato Nacional Open 2026 | El Salvador | 29 | Ver |
| 13 jun 2026 | Guevara Sanchez, Erick Marvin 2067 | Guevara Ruiz, Marvin Andres 2149 | 1-0 | B00 Defensa Rata: Harmonist | Segundo Campeonato Nacional Open 2026 | El Salvador | 57 | Ver |
| 16 may 2026 | Reyes Zavaleta, Cristhian Yamil 2261 | Guevara Ruiz, Marvin Andres 2028 | 1-0 | E08 Apertura Catalana: Closed | XV Campeonato Panamericano U7 - U17 de Ajedrez 2026 | O17 | 34 | Ver |
| 14 may 2026 | Ibarra Carlos Roberto 2202 | Guevara Ruiz, Marvin Andres 2028 | ½-½ | A45 Defensa India | XV Campeonato Panamericano U7 - U17 de Ajedrez 2026 | O17 | 15 | Ver |
| 13 may 2026 | Levano Loayza, Adriano Jaffet 2072 | Guevara Ruiz, Marvin Andres 2028 | ½-½ | B45 Defensa Siciliana: Taimanov Variation | XV Campeonato Panamericano U7 - U17 de Ajedrez 2026 | O17 | 46 | Ver |
| 31 mar 2026 | Mendez Machado, Andre 2188 | Guevara Ruiz, Marvin Andres 2015 | 1-0 | B30 Defensa Siciliana: Nyezhmetdinov-Rossolimo Attack | Campeonato Centroamericano y del Caribe SUB 20 2026 | 43 | Ver |
| 30 mar 2026 | Guevara Ruiz, Marvin Andres 2015 | Lizano Quiros, Matias Haziel 2244 | ½-½ | B12 Defensa Caro-Kann: Advance Variation | Campeonato Centroamericano y del Caribe SUB 20 2026 | 32 | Ver |
| 29 mar 2026 | Guevara Ruiz, Marvin Andres 2015 | Vargas Arguedas, Caleb 2032 | ½-½ | B56 Defensa Siciliana: Classical Variation | Campeonato Centroamericano y del Caribe SUB 20 2026 | 43 | Ver |
| 28 mar 2026 | Leon Infante, Bryan 2174 | Guevara Ruiz, Marvin Andres 2015 | ½-½ | D02 Apertura de Peón de Dama: London System | Campeonato Centroamericano y del Caribe SUB 20 2026 | 35 | Ver |
| 4 nov 2025 | Delgado Caballero, Nigel Alejandro 2005 | Guevara Ruiz, Marvin Andres 2018 | 1-0 | A13 Apertura Inglesa: Neo-Catalan | VII Juegos Deportivos Escolares Centroamericanos del Caribe 2025 | Clásico Masc | 41 | Ver |
| 4 nov 2025 | Guevara Ruiz, Marvin Andres 2018 | Espinoza Guerrero, Felix Alberto 2002 | 0-1 | B38 Defensa Siciliana: Accelerated Dragon, Maróczy Bind | VII Juegos Deportivos Escolares Centroamericanos del Caribe 2025 | Clásico Masc | 59 | Ver |
| 3 nov 2025 | Colmenarez Rivero, Jheremias David 2128 | Guevara Ruiz, Marvin Andres 2018 | 0-1 | E05 Apertura Catalana: Open Defense, Classical Line | VII Juegos Deportivos Escolares Centroamericanos del Caribe 2025 | Clásico Masc | 44 | Ver |