| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. O Yepez vs F Blatny |
| 0-1 | 23 |
1957 |
WchT U26 04th | E59 Nimzo-Indian, 4.e3, Main line |
| 2. Portisch vs O Yepez |
| 1-0 | 42 |
1957 |
WchT U26 04th | A66 Benoni |
| 3. Tringov vs O Yepez |
| 1-0 | 23 |
1957 |
WchT U26 04th | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 4. G P Thibaut vs O Yepez |
| ½-½ | 41 |
1960 |
Leipzig ol (Men) qual-D | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 5. O Yepez vs Fischer |
 | 0-1 | 41 |
1966 |
Havana ol prel | E91 King's Indian |
| 6. O Yepez vs B Kerr |
| ½-½ | 27 |
1966 |
Havana ol final-C | E63 King's Indian, Fianchetto, Panno Variation |
| 7. O Yepez vs Karpov |
 | 0-1 | 39 |
1970 |
13, Caracas | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 8. Benko vs O Yepez |
| 1-0 | 33 |
1970 |
Caracas it | A56 Benoni Defense |
| 9. O Yepez vs Bisguier |
| ½-½ | 35 |
1970 |
Caracas it | E43 Nimzo-Indian, Fischer Variation |
| 10. G Villarroel vs O Yepez |
| ½-½ | 42 |
1970 |
Caracas it | B43 Sicilian, Kan, 5.Nc3 |
| 11. Ivkov vs O Yepez |
| 1-0 | 57 |
1970 |
Caracas | E62 King's Indian, Fianchetto |
| 12. O Yepez vs M Cuellar-Gacharna |
| ½-½ | 46 |
1970 |
Caracas it | B57 Sicilian |
| 13. W G Addison vs O Yepez |
 | 1-0 | 39 |
1970 |
Caracas it | E69 King's Indian, Fianchetto, Classical Main line |
| 14. Kavalek vs O Yepez |
| 1-0 | 53 |
1970 |
Caracas it | E90 King's Indian |
| 15. Slujssar vs O Yepez |
| 0-1 | 27 |
1970 |
Caracas it | B28 Sicilian, O'Kelly Variation |
| 16. O Yepez vs Stein |
| 0-1 | 54 |
1970 |
Caracas it | E82 King's Indian, Samisch, double Fianchetto Variation |
| 17. O Yepez vs Panno |
| 0-1 | 43 |
1970 |
Caracas it | B42 Sicilian, Kan |
| 18. O Yepez vs Parma |
| ½-½ | 20 |
1970 |
Caracas it | E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3 |
| 19. O Yepez vs A Caro |
| 1-0 | 47 |
1970 |
Caracas it | C95 Ruy Lopez, Closed, Breyer |
| 20. O Yepez vs O'Kelly |
| ½-½ | 21 |
1970 |
Caracas it | B49 Sicilian, Taimanov Variation |
| 21. G Barcza vs O Yepez |
| ½-½ | 29 |
1970 |
Caracas it | A05 Reti Opening |
| 22. O Yepez vs G Sigurjonsson |
| ½-½ | 39 |
1970 |
Caracas it | B09 Pirc, Austrian Attack |
| 23. O Sarapu vs O Yepez |
| 1-0 | 41 |
1974 |
Olympiad | C77 Ruy Lopez |
| 24. Suttles vs O Yepez |
| 1-0 | 40 |
1974 |
Nice (ol) | A00 Uncommon Opening |