| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. A Olivera vs M E de Freitas |
| 1-0 | 38 | 1948 | Mar del Plata | E32 Nimzo-Indian, Classical |
| 27. A Olivera vs Denker |
| ½-½ | 51 | 1948 | Mar del Plata | D43 Queen's Gambit Declined Semi-Slav |
| 28. M Castillo vs A Olivera |
| 1-0 | 38 | 1948 | Mar del Plata | D30 Queen's Gambit Declined |
| 29. A Olivera vs Guimard |
| 0-1 | 22 | 1948 | Mar del Plata | A84 Dutch |
| 30. H Rossetto vs A Olivera |
| 1-0 | 52 | 1948 | Mar del Plata | A13 English |
| 31. A Olivera vs A Medina Garcia |
| 0-1 | 40 | 1948 | Mar del Plata | E71 King's Indian, Makagonov System (5.h3) |
| 32. Eliskases vs A Olivera |
 | 1-0 | 37 | 1948 | Mar del Plata | B13 Caro-Kann, Exchange |
| 33. A Olivera vs Najdorf |
 | ½-½ | 56 | 1948 | Mar del Plata | A48 King's Indian |
| 34. Szabo vs A Olivera |
| 1-0 | 56 | 1948 | Mar del Plata | A06 Reti Opening |
| 35. A Olivera vs O'Kelly |
| 1-0 | 42 | 1948 | Mar del Plata | E26 Nimzo-Indian, Samisch |
| 36. R Sanguinetti vs A Olivera |
| ½-½ | 22 | 1948 | Mar del Plata | D55 Queen's Gambit Declined |
| 37. A Olivera vs Jacobo Bolbochan |
| ½-½ | 28 | 1948 | Mar del Plata | E37 Nimzo-Indian, Classical |
| 38. Pilnik vs A Olivera |
| ½-½ | 45 | 1948 | Mar del Plata | C18 French, Winawer |
| 39. A Olivera vs M Luckis |
| 0-1 | 67 | 1948 | Mar del Plata | E26 Nimzo-Indian, Samisch |
| 40. C H Maderna vs A Olivera |
| 1-0 | 21 | 1948 | Mar del Plata | D31 Queen's Gambit Declined |
| 41. Gligoric vs A Olivera |
| 1-0 | 31 | 1953 | Montevideo | D55 Queen's Gambit Declined |
| 42. Pelikan vs A Olivera |
| ½-½ | 63 | 1956 | Mar del Plata | A03 Bird's Opening |
| 43. A Olivera vs C H Maderna |
| ½-½ | 30 | 1956 | Mar del Plata | A62 Benoni, Fianchetto Variation |
| 44. S T V Lukas vs A Olivera |
| 1-0 | 71 | 1956 | Mar del Plata | C02 French, Advance |
| 45. A Olivera vs R A Redolfi |
| 0-1 | 29 | 1956 | Mar del Plata | A62 Benoni, Fianchetto Variation |
| 46. Julio Bolbochan vs A Olivera |
| 1-0 | 23 | 1956 | Mar del Plata | D02 Queen's Pawn Game |
| 47. A Olivera vs Najdorf |
| 0-1 | 24 | 1956 | Mar del Plata | A48 King's Indian |
| 48. R Shocron vs A Olivera |
| 1-0 | 57 | 1956 | Mar del Plata | C17 French, Winawer, Advance |
| 49. A Olivera vs H Rossetto |
| 0-1 | 19 | 1956 | Mar del Plata | B33 Sicilian |
| 50. B Wexler vs A Olivera |
| 1-0 | 33 | 1956 | Mar del Plata | A07 King's Indian Attack |
Kibitzing
