| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. I Mendivil vs Quinteros |
| 0-1 | 36 | 1969 | Mar del Plata Zonal | B06 Robatsch |
| 52. I Mendivil vs J Canobra |
| 1-0 | 41 | 1969 | Mar del Plata Zonal | B32 Sicilian |
| 53. J Rubinetti vs I Mendivil |
| 1-0 | 55 | 1969 | Mar del Plata Zonal | E92 King's Indian |
| 54. I Mendivil vs V Riego |
| 0-1 | 34 | 1969 | Mar del Plata Zonal | B06 Robatsch |
| 55. J L Alvarez del Monte vs I Mendivil |
| ½-½ | 42 | 1969 | Mar del Plata Zonal | E87 King's Indian, Samisch, Orthodox |
| 56. A C Rocha vs I Mendivil |
| 1-0 | 35 | 1969 | Mar del Plata Zonal | B07 Pirc |
| 57. I Mendivil vs R Garcia |
| 0-1 | 90 | 1969 | Mar del Plata Zonal | B32 Sicilian |
| 58. Najdorf vs I Mendivil |
| 1-0 | 33 | 1969 | Mar del Plata Zonal | E73 King's Indian |
| 59. H Camara vs I Mendivil |
| 1-0 | 27 | 1969 | Mar del Plata Zonal | B06 Robatsch |
| 60. I Mendivil vs L Bronstein |
| 0-1 | 46 | 1969 | Mar del Plata Zonal | B32 Sicilian |
| 61. S Schweber vs I Mendivil |
| 1-0 | 45 | 1969 | Mar del Plata Zonal | E73 King's Indian |
| 62. I Mendivil vs H Rossetto |
| 0-1 | 37 | 1969 | Mar del Plata Zonal | C80 Ruy Lopez, Open |
| 63. P Garcia Toledo vs I Mendivil |
| 1-0 | 35 | 1969 | Mar del Plata Zonal | E77 King's Indian |
| 64. Panno vs I Mendivil |
| 1-0 | 28 | 1969 | Mar del Plata Zonal | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 65. I Mendivil vs C Silva Sanchez |
| 0-1 | 51 | 1969 | Mar del Plata Zonal | C17 French, Winawer, Advance |
| 66. I Mendivil vs H van Riemsdijk |
| 0-1 | 30 | 1969 | Mar del Plata Zonal | C55 Two Knights Defense |
| 67. Mecking vs I Mendivil |
| 1-0 | 45 | 1969 | Mar del Plata Zonal | B06 Robatsch |
| 68. W Estrada Degrandi vs I Mendivil |
| 1-0 | 57 | 1971 | 1st Pan American Team Championship | A48 King's Indian |
| 69. H van Riemsdijk vs I Mendivil |
| 1-0 | 27 | 1971 | 1st Pan American Team Championship | B09 Pirc, Austrian Attack |
| 70. I Mendivil vs P Carrera |
| 0-1 | 40 | 1971 | 1st Pan American Team Championship | C50 Giuoco Piano |
| 71. C Silva Sanchez vs I Mendivil |
| 1-0 | 57 | 1971 | 1st Pan American Team Championship | C91 Ruy Lopez, Closed |
| 72. I Mendivil vs E Cobo Arteaga |
| 0-1 | 41 | 1971 | 1st Pan American Team Championship | B84 Sicilian, Scheveningen |
| 73. L Ogaard vs I Mendivil |
| 1-0 | 42 | 1972 | Skopje Olympiad qual-3 | E97 King's Indian |
| 74. I Mendivil vs H van Riemsdijk |
| 0-1 | 41 | 1972 | Skopje Olympiad Final-C | B33 Sicilian |
| 75. M Keeshan vs I Mendivil |
| ½-½ | 78 | 1972 | Skopje Olympiad Final-C | E97 King's Indian |
Kibitzing
