| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. E Cotta vs R Camara |
| 1-0 | 10 | 1965 | BRA-ch+ | B72 Sicilian, Dragon |
| 27. E Cotta vs F Alves |
| 1-0 | 32 | 1965 | Brazilian Championship | E26 Nimzo-Indian, Samisch |
| 28. E Cotta vs A C Rocha |
| ½-½ | 26 | 1966 | Clube de Xadrez Sao Paulo Championship | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 29. E Cotta vs L Engels |
| 1-0 | 64 | 1966 | Clube de Xadrez Sao Paulo Championship | B95 Sicilian, Najdorf, 6...e6 |
| 30. J de Souza Mendes vs E Cotta |
| 0-1 | 31 | 1966 | Clube de Xadrez Sao Paulo Championship | C77 Ruy Lopez |
| 31. E Cotta vs M E de Freitas |
| 0-1 | 45 | 1966 | Clube de Xadrez Sao Paulo Championship | A56 Benoni Defense |
| 32. M Fischman vs E Cotta |
| ½-½ | 41 | 1966 | Clube de Xadrez Sao Paulo Championship | C46 Three Knights |
| 33. G W Fonrobert vs E Cotta |
| 1-0 | 35 | 1966 | Clube de Xadrez Sao Paulo Championship | E87 King's Indian, Samisch, Orthodox |
| 34. E Cotta vs Mecking |
| ½-½ | 59 | 1966 | Clube de Xadrez Sao Paulo Championship | E73 King's Indian |
| 35. S Schweber vs E Cotta |
| 0-1 | 50 | 1966 | Clube de Xadrez Sao Paulo Championship | D24 Queen's Gambit Accepted |
| 36. E Cotta vs S Ammar |
| 1-0 | 25 | 1966 | Clube de Xadrez Sao Paulo Championship | A52 Budapest Gambit |
| 37. E Cotta vs L R Borges |
| 0-1 | 35 | 1966 | Brazilian Championship | C12 French, McCutcheon |
| 38. J de Souza Mendes vs E Cotta |
| ½-½ | 22 | 1966 | Brazilian Championship | C92 Ruy Lopez, Closed |
| 39. E Cotta vs A Teofilo |
| 0-1 | 43 | 1966 | Brazilian Championship | C68 Ruy Lopez, Exchange |
| 40. J Pinto Paiva vs E Cotta |
| 0-1 | 29 | 1966 | Brazilian Championship | C84 Ruy Lopez, Closed |
| 41. E Cotta vs G W Fonrobert |
| ½-½ | 43 | 1966 | Brazilian Championship | C45 Scotch Game |
| 42. H Camara vs E Cotta |
| 0-1 | 39 | 1966 | Brazilian Championship | E60 King's Indian Defense |
| 43. E Cotta vs V Adamowski |
| 1-0 | 48 | 1966 | Brazilian Championship | C44 King's Pawn Game |
| 44. C Duarte vs E Cotta |
| 0-1 | 20 | 1966 | Brazilian Championship | A21 English |
| 45. E Cotta vs J Mangini |
| ½-½ | 23 | 1966 | Brazilian Championship | B94 Sicilian, Najdorf |
| 46. H Caspary vs E Cotta |
| 0-1 | 39 | 1966 | Brazilian Championship | A08 King's Indian Attack |
| 47. M Miranda vs E Cotta |
| ½-½ | 18 | 1966 | Brazilian Championship | A15 English |
| 48. E Cotta vs P H Mori |
| 1-0 | 37 | 1966 | Brazilian Championship | D90 Grunfeld |
| 49. F G Pimentel vs E Cotta |
| ½-½ | 18 | 1966 | Brazilian Championship | B94 Sicilian, Najdorf |
| 50. E Cotta vs E Asfora |
 | ½-½ | 55 | 1966 | Brazilian Championship | B40 Sicilian |
Kibitzing
