| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. P Kostenko vs R E Mejias Nunez |
| 1-0 | 49 | 2018 | Batumi Olympiad | A45 Queen's Pawn Game |
| 2. A Al Maashani vs R E Mejias Nunez |
| 1-0 | 58 | 2018 | Batumi Olympiad | C25 Vienna |
| 3. R E Mejias Nunez vs P Kawuma |
| 0-1 | 50 | 2018 | Batumi Olympiad | A48 King's Indian |
| 4. F Ashiku vs R E Mejias Nunez |
| 1-0 | 39 | 2018 | Batumi Olympiad | A06 Reti Opening |
| 5. R E Mejias Nunez vs A Bouzidi |
| 0-1 | 44 | 2018 | Batumi Olympiad | E17 Queen's Indian |
| 6. R E Mejias Nunez vs J Picado |
| 0-1 | 40 | 2018 | Batumi Olympiad | E17 Queen's Indian |
| 7. R E Mejias Nunez vs G B Esungi |
| 1-0 | 25 | 2018 | Batumi Olympiad | D06 Queen's Gambit Declined |
| 8. P M Singe vs R E Mejias Nunez |
| 0-1 | 34 | 2018 | Batumi Olympiad | B33 Sicilian |
| 9. C Psaila vs R E Mejias Nunez |
| ½-½ | 33 | 2018 | Batumi Olympiad | A13 English |
| 10. R E Mejias Nunez vs E Espinosa |
| 0-1 | 49 | 2023 | Iberoamericano Championship | B30 Sicilian |
| 11. R E Mejias Nunez vs D I Leal Licon |
| 1-0 | 36 | 2023 | Iberoamericano Championship | B13 Caro-Kann, Exchange |
| 12. F Nunez Giler vs R E Mejias Nunez |
| 0-1 | 70 | 2023 | Iberoamericano Championship | A46 Queen's Pawn Game |
| 13. D A Cabezas Solano vs R E Mejias Nunez |
| 1-0 | 35 | 2023 | Iberoamericano Championship | E11 Bogo-Indian Defense |
| 14. R E Mejias Nunez vs R O Sanchez Bermudez |
| ½-½ | 38 | 2023 | Iberoamericano Championship | B42 Sicilian, Kan |
| 15. J Gestoso Ruiz vs R E Mejias Nunez |
| 0-1 | 52 | 2023 | Iberoamericano Championship | B28 Sicilian, O'Kelly Variation |
| 16. R E Mejias Nunez vs D Z Leal Escamilla |
| 1-0 | 34 | 2023 | Iberoamericano Championship | C75 Ruy Lopez, Modern Steinitz Defense |
| 17. K Noboa Silva vs R E Mejias Nunez |
| 1-0 | 29 | 2023 | Iberoamericano Championship | E11 Bogo-Indian Defense |
| 18. R E Mejias Nunez vs M Rodriguez Arrieta |
| ½-½ | 37 | 2023 | Iberoamericano Championship | C53 Giuoco Piano |
| 19. M Conteh vs R E Mejias Nunez |
| 0-1 | 29 | 2024 | Budapest Olympiad | C91 Ruy Lopez, Closed |
| 20. R E Mejias Nunez vs I Gourlay |
| 0-1 | 30 | 2024 | Budapest Olympiad | B32 Sicilian |
| 21. Linn Phone Myat vs R E Mejias Nunez |
| ½-½ | 57 | 2024 | Budapest Olympiad | C27 Vienna Game |
| 22. D Gong vs R E Mejias Nunez |
| ½-½ | 46 | 2024 | Budapest Olympiad | C43 Petrov, Modern Attack |
| 23. R E Mejias Nunez vs E T Mushore |
| 0-1 | 79 | 2024 | Budapest Olympiad | C77 Ruy Lopez |
| 24. S D Pitamber vs R E Mejias Nunez |
| ½-½ | 49 | 2024 | Budapest Olympiad | B43 Sicilian, Kan, 5.Nc3 |
| 25. R E Mejias Nunez vs T Arunnuntapanich |
| 1-0 | 58 | 2024 | Budapest Olympiad | B45 Sicilian, Taimanov |
Kibitzing
