| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Rubinetti vs V Riego |
| 1-0 | 106 | 1969 | Mar del Plata Zonal | B80 Sicilian, Scheveningen |
| 27. V Riego vs C Silva Sanchez |
| 1-0 | 52 | 1969 | Mar del Plata Zonal | C63 Ruy Lopez, Schliemann Defense |
| 28. V Chemin vs V Riego |
| 1-0 | 41 | 1971 | 1st Pan American Team Championship | A04 Reti Opening |
| 29. D Godoy vs V Riego |
| ½-½ | 81 | 1971 | 1st Pan American Team Championship | B06 Robatsch |
| 30. V Riego vs E Cobo Arteaga |
| ½-½ | 32 | 1971 | 1st Pan American Team Championship | B95 Sicilian, Najdorf, 6...e6 |
| 31. W Estrada Degrandi vs V Riego |
| ½-½ | 42 | 1971 | 1st Pan American Team Championship | B08 Pirc, Classical |
| 32. V Riego vs P Ramirez |
| 0-1 | 55 | 1971 | 1st Pan American Team Championship | C78 Ruy Lopez |
| 33. D Verduga vs V Riego |
| ½-½ | 36 | 1971 | 1st Pan American Team Championship | E76 King's Indian, Four Pawns Attack |
| 34. V Riego vs R Sanguineti |
| ½-½ | 32 | 1971 | 1st Pan American Team Championship | C60 Ruy Lopez |
| 35. J Tarjan vs V Riego |
| 1-0 | 60 | 1978 | Buenos Aires Olympiad | E73 King's Indian |
| 36. V Riego vs M Fuller |
| ½-½ | 72 | 1978 | Buenos Aires Olympiad | B06 Robatsch |
| 37. V Riego vs H Ree |
| ½-½ | 19 | 1978 | Buenos Aires Olympiad | A07 King's Indian Attack |
| 38. B Nickoloff vs V Riego |
| ½-½ | 57 | 1978 | Buenos Aires Olympiad | B06 Robatsch |
| 39. V Riego vs C Braga |
| 0-1 | 56 | 1978 | Buenos Aires Olympiad | A07 King's Indian Attack |
| 40. V Riego vs N Magaldi |
| 1-0 | 45 | 1987 | 3rd Pan American Team Championship | B18 Caro-Kann, Classical |
| 41. C Schwanek vs V Riego |
| 0-1 | 49 | 1987 | 3rd Pan American Team Championship | A42 Modern Defense, Averbakh System |
| 42. V Riego vs R Araya Villalonga |
| 0-1 | 47 | 1987 | 3rd Pan American Team Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 43. V Riego vs W Arencibia Rodriguez |
| 1-0 | 55 | 1987 | 3rd Pan American Team Championship | C02 French, Advance |
| 44. J Aguilar vs V Riego |
| 1-0 | 58 | 1987 | 3rd Pan American Team Championship | B06 Robatsch |
| 45. V Riego vs Robatsch |
 | 0-1 | 35 | 1994 | Moscow Olympiad | B58 Sicilian |
| 46. V Riego vs B Ferrufino |
| 1-0 | 60 | 1995 | 5th Pan American Team Championship | B12 Caro-Kann Defense |
| 47. D Barria vs V Riego |
| 1-0 | 35 | 1995 | 5th Pan American Team Championship | B06 Robatsch |
| 48. J Borges Matos vs V Riego |
| 1-0 | 52 | 1995 | 5th Pan American Team Championship | A40 Queen's Pawn Game |
| 49. V Riego vs J F Cubas |
| 1-0 | 44 | 1996 | PAR-ch | B21 Sicilian, 2.f4 and 2.d4 |
| 50. G Vescovi vs V Riego |
| 1-0 | 45 | 1996 | 5th Pan American Team Championship | A41 Queen's Pawn Game (with ...d6) |
Kibitzing
