| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. C Cuartas vs R Ortega |
| 1-0 | 44 | 1966 | Pan American Championship | E93 King's Indian, Petrosian System |
| 27. C Cuartas vs M Cuellar Gacharna |
| 1-0 | 61 | 1966 | Pan American Championship | E17 Queen's Indian |
| 28. C Cuartas vs G Martinez Vaca |
| 0-1 | 60 | 1966 | Pan American Championship | E69 King's Indian, Fianchetto, Classical Main line |
| 29. C Cuartas vs E Jimenez Zerquera |
| 1-0 | 34 | 1966 | Pan American Championship | E91 King's Indian |
| 30. F Roux Cabral vs C Cuartas |
| 0-1 | 32 | 1966 | Pan American Championship | D02 Queen's Pawn Game |
| 31. Letelier vs C Cuartas |
| ½-½ | 23 | 1966 | Pan American Championship | D37 Queen's Gambit Declined |
| 32. J Rodriguez vs C Cuartas |
| 0-1 | 50 | 1966 | Pan American Championship | D37 Queen's Gambit Declined |
| 33. O Yepez Obando vs C Cuartas |
| 0-1 | 34 | 1966 | Pan American Championship | D55 Queen's Gambit Declined |
| 34. S Schweber vs C Cuartas |
| ½-½ | 13 | 1966 | Pan American Championship | C70 Ruy Lopez |
| 35. M Ahmed Bakali vs C Cuartas |
 | 0-1 | 43 | 1966 | Havana Olympiad qual-7 | C16 French, Winawer |
| 36. C Cuartas vs N Minev |
| ½-½ | 39 | 1966 | Havana Olympiad qual-7 | E09 Catalan, Closed |
| 37. K Ojanen vs C Cuartas |
| 1-0 | 26 | 1966 | Havana Olympiad qual-7 | E59 Nimzo-Indian, 4.e3, Main line |
| 38. C Cuartas vs L Vizantiadis |
| 0-1 | 37 | 1966 | Havana Olympiad qual-7 | E90 King's Indian |
| 39. Gheorghiu vs C Cuartas |
| 1-0 | 30 | 1966 | Havana Olympiad qual-7 | C16 French, Winawer |
| 40. C Cuartas vs A Tenorio |
| 1-0 | 33 | 1966 | Havana Olympiad qual-7 | E07 Catalan, Closed |
| 41. M Johansson vs C Cuartas |
| ½-½ | 58 | 1966 | Havana Olympiad Final-B | C18 French, Winawer |
| 42. C Cuartas vs Y Porat |
| 1-0 | 45 | 1966 | Havana Olympiad Final-B | E17 Queen's Indian |
| 43. A Prameshuber vs C Cuartas |
| 1-0 | 45 | 1966 | Havana Olympiad Final-B | E12 Queen's Indian |
| 44. C Cuartas vs E Bhend |
| 1-0 | 41 | 1966 | Havana Olympiad Final-B | A97 Dutch, Ilyin-Genevsky |
| 45. K Ojanen vs C Cuartas |
| 1-0 | 42 | 1966 | Havana Olympiad Final-B | D58 Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) Syst |
| 46. C Cuartas vs J Bednarski |
| ½-½ | 16 | 1966 | Havana Olympiad Final-B | E91 King's Indian |
| 47. G Mazzoni vs C Cuartas |
| 0-1 | 29 | 1966 | Havana Olympiad Final-B | C19 French, Winawer, Advance |
| 48. C Cuartas vs P H Clarke |
| 1-0 | 58 | 1966 | Havana Olympiad Final-B | D02 Queen's Pawn Game |
| 49. M Fallone vs C Cuartas |
| 0-1 | 38 | 1966 | Havana Olympiad Final-B | A45 Queen's Pawn Game |
| 50. C Cuartas vs O'Kelly |
| 0-1 | 38 | 1966 | Havana Olympiad Final-B | A52 Budapest Gambit |
Kibitzing
