| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. P Pasero vs J M Rivarola |
| 1-0 | 20 | 1940 | ch | D05 Queen's Pawn Game |
| 27. R Porral vs J M Rivarola |
| ½-½ | 33 | 1943 | Santa Fe | D61 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 28. C J Corte vs J M Rivarola |
| 1-0 | 68 | 1948 | Santa Fe | C53 Giuoco Piano |
| 29. J P Rubinstein vs J M Rivarola |
| 1-0 | 41 | 1948 | Santa Fe | C51 Evans Gambit |
| 30. J M Rivarola vs A Bahamonde |
| ½-½ | 41 | 1948 | Santa Fe | C83 Ruy Lopez, Open |
| 31. J M Rivarola vs L Chemes |
| ½-½ | 22 | 1948 | Santa Fe | B73 Sicilian, Dragon, Classical |
| 32. J M Rivarola vs O Garcia Vera |
| 0-1 | 28 | 1948 | Santa Fe | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 33. J M Rivarola vs C H Maderna |
| ½-½ | 37 | 1948 | Santa Fe | C67 Ruy Lopez |
| 34. H Rossetto vs J M Rivarola |
| 0-1 | 66 | 1948 | Santa Fe | A13 English |
| 35. J M Rivarola vs M Czerniak |
 | 0-1 | 67 | 1949 | Santa Fe | C14 French, Classical |
| 36. A Pomar vs J M Rivarola |
| 1-0 | 27 | 1949 | Santa Fe | A55 Old Indian, Main line |
| 37. J M Rivarola vs R Sanguinetti |
| 0-1 | 48 | 1949 | Santa Fe | C91 Ruy Lopez, Closed |
| 38. H Rossetto vs J M Rivarola |
| 1-0 | 36 | 1949 | Santa Fe | D51 Queen's Gambit Declined |
| 39. J M Rivarola vs F Francia |
| 0-1 | 30 | 1949 | Santa Fe | B73 Sicilian, Dragon, Classical |
| 40. A Bahamonde vs J M Rivarola |
| 0-1 | 67 | 1949 | Santa Fe | A53 Old Indian |
| 41. O Garcia Vera vs J M Rivarola |
| 1-0 | 49 | 1949 | Santa Fe | D37 Queen's Gambit Declined |
Kibitzing
