| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Diaz vs J Rodriguez Gonzalez |
| ½-½ | 42 | 1968 | Capablanca Memorial | A70 Benoni, Classical with 7.Nf3 |
| 27. J Diaz vs Kholmov |
 | 0-1 | 44 | 1968 | Capablanca Memorial | C95 Ruy Lopez, Closed, Breyer |
| 28. J Diaz vs E Jimenez Zerquera |
| 0-1 | 42 | 1968 | Capablanca Memorial | B18 Caro-Kann, Classical |
| 29. M Damjanovic vs J Diaz |
| ½-½ | 87 | 1968 | Capablanca Memorial | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 30. D Drimer vs J Diaz |
| ½-½ | 100 | 1968 | Capablanca Memorial | C41 Philidor Defense |
| 31. Suetin vs J Diaz |
| 1-0 | 42 | 1968 | Capablanca Memorial | E71 King's Indian, Makagonov System (5.h3) |
| 32. P Ostojic vs J Diaz |
| 1-0 | 26 | 1968 | Capablanca Memorial | C09 French, Tarrasch, Open Variation, Main line |
| 33. Stein vs J Diaz |
| 1-0 | 50 | 1968 | Capablanca Memorial | A05 Reti Opening |
| 34. J Diaz vs E Cobo Arteaga |
| 0-1 | 28 | 1968 | Capablanca Memorial | C92 Ruy Lopez, Closed |
| 35. J H Donner vs J Diaz |
| 1-0 | 33 | 1968 | Capablanca Memorial | E62 King's Indian, Fianchetto |
| 36. J Diaz vs S Garcia Martinez |
| ½-½ | 16 | 1968 | Capablanca Memorial | E11 Bogo-Indian Defense |
| 37. J Diaz vs S Kajan |
| ½-½ | 50 | 1968 | Lugano Olympiad Final-B | C87 Ruy Lopez |
| 38. J Diaz vs F Cornelis |
| ½-½ | 40 | 1968 | Lugano Olympiad Final-B | A70 Benoni, Classical with 7.Nf3 |
| 39. J Diaz vs M Basman |
| 0-1 | 26 | 1968 | Lugano Olympiad Final-B | C41 Philidor Defense |
| 40. S Purevzhav vs J Diaz |
| ½-½ | 56 | 1968 | Lugano Olympiad Final-B | E77 King's Indian |
| 41. J Diaz vs K Skold |
| 1-0 | 47 | 1968 | Lugano Olympiad Final-B | C92 Ruy Lopez, Closed |
| 42. R Calvo Minguez vs J Diaz |
| 1-0 | 39 | 1968 | Lugano Olympiad Final-B | C41 Philidor Defense |
| 43. J Diaz vs R M McKay |
| ½-½ | 49 | 1968 | Lugano Olympiad Final-B | B03 Alekhine's Defense |
| 44. E Ermenkov vs J Diaz |
| ½-½ | 61 | 1969 | World Junior Championship qual-6 | A15 English |
| 45. J Seret vs J Diaz |
| 0-1 | 27 | 1969 | World Junior Championship qual-6 | B32 Sicilian |
| 46. J Diaz vs L Vogt |
| ½-½ | 31 | 1969 | World Junior Championship qual-6 | B06 Robatsch |
| 47. G Makropoulos vs J Diaz |
| 0-1 | 34 | 1969 | World Junior Championship qual-6 | B22 Sicilian, Alapin |
| 48. J Diaz vs L Ogaard |
| ½-½ | 21 | 1969 | World Junior Championship qual-6 | B02 Alekhine's Defense |
| 49. J Diaz vs T Wibe |
| 0-1 | 27 | 1969 | World Student Team Championship qual-4 | B06 Robatsch |
| 50. R Postler vs J Diaz |
| 0-1 | 40 | 1969 | World Student Team Championship qual-4 | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
Kibitzing
