| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J C Diaz vs Antoshin |
| 0-1 | 49 |
1968 |
Capablanca mem | B88 Sicilian, Fischer-Sozin Attack |
| 2. Suetin vs J C Diaz |
| 1-0 | 42 |
1968 |
Havana | E90 King's Indian |
| 3. J C Diaz vs Kholmov |
| 0-1 | 44 |
1968 |
Capablanca mem | C95 Ruy Lopez, Closed, Breyer |
| 4. J C Diaz vs J Lobigas |
| 0-1 | 42 |
1972 |
Skopje ol (Men) | A32 English, Symmetrical Variation |
| 5. Ribli vs J C Diaz |
| 1-0 | 59 |
1972 |
Cienfuegos | D80 Grunfeld |
| 6. Minev vs J C Diaz |
| ½-½ | 57 |
1972 |
Capablanca mem | D94 Grunfeld |
| 7. Savon vs J C Diaz |
| ½-½ | 44 |
1973 |
Capablanca mem | D37 Queen's Gambit Declined |
| 8. J C Diaz vs Keene |
| 0-1 | 16 |
1974 |
Capablanca mem-B | B09 Pirc, Austrian Attack |
| 9. Vasiukov vs J C Diaz |
| 1-0 | 33 |
1975 |
Capablanca mem-A | B22 Sicilian, Alapin |
| 10. J C Diaz vs Razuvaev |
| 0-1 | 51 |
1975 |
Capablanca mem-A | C62 Ruy Lopez, Old Steinitz Defense |
| 11. J C Diaz vs Smyslov |
| ½-½ | 46 |
1976 |
18, Biel izt | A45 Queen's Pawn Game |
| 12. Huebner vs J C Diaz |
| 1-0 | 46 |
1976 |
Biel izt | A41 Queen's Pawn Game (with ...d6) |
| 13. J C Diaz vs Ulf Andersson |
 | 0-1 | 49 |
1976 |
Izt (cat.12), Biel (Switzerland) | B46 Sicilian, Taimanov Variation |
| 14. K Rogoff vs J C Diaz |
| ½-½ | 31 |
1976 |
Biel izt | A41 Queen's Pawn Game (with ...d6) |
| 15. J C Diaz vs Gulko |
| 0-1 | 56 |
1976 |
Biel izt | B60 Sicilian, Richter-Rauzer |
| 16. J C Diaz vs Smejkal |
| 0-1 | 41 |
1976 |
Biel Interzonal | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 17. Geller vs J C Diaz |
| 1-0 | 35 |
1976 |
Biel izt | E81 King's Indian, Samisch |
| 18. J C Diaz vs Marjanovic |
| 0-1 | 30 |
1976 |
Vrnjachka Banja (Yugoslavia) | B92 Sicilian, Najdorf, Opocensky Variation |
| 19. Tal vs J C Diaz |
 | 1-0 | 35 |
1976 |
Biel izt | A57 Benko Gambit |
| 20. J C Diaz vs R Sanguineti |
| 0-1 | 24 |
1976 |
Biel izt | B46 Sicilian, Taimanov Variation |
| 21. J C Diaz vs Portisch |
| 0-1 | 34 |
1976 |
Biel | B43 Sicilian, Kan, 5.Nc3 |
| 22. J C Diaz vs Csom |
| ½-½ | 49 |
1976 |
Biel izt | D63 Queen's Gambit Declined, Orthodox Defense |
| 23. A Lombard vs J C Diaz |
| 1-0 | 25 |
1976 |
Izt (cat.12) | E00 Queen's Pawn Game |
| 24. J C Diaz vs Larsen |
| 0-1 | 49 |
1976 |
Biel Interzonal | B41 Sicilian, Kan |
| 25. J C Diaz vs R Byrne |
| 0-1 | 26 |
1976 |
Biel izt | B92 Sicilian, Najdorf, Opocensky Variation |