| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. M de Athayde vs H Camara |
| ½-½ | 95 | 1963 | Brazilian Championship | A04 Reti Opening |
| 27. M de Athayde vs A Foguelman |
 | 1-0 | 30 | 1963 | Fortaleza Zonal | B93 Sicilian, Najdorf, 6.f4 |
| 28. M de Athayde vs E Asfora |
| 1-0 | 31 | 1963 | Fortaleza Zonal | D74 Neo-Grunfeld, 6.cd Nxd5, 7.O-O |
| 29. C Espinoza Rivasplata vs M de Athayde |
| 0-1 | 44 | 1963 | Fortaleza Zonal | A97 Dutch, Ilyin-Genevsky |
| 30. A C Rocha vs M de Athayde |
| ½-½ | 91 | 1963 | Fortaleza Zonal | B43 Sicilian, Kan, 5.Nc3 |
| 31. M de Athayde vs J Klein |
| 1-0 | 37 | 1963 | Fortaleza Zonal | A60 Benoni Defense |
| 32. O Quinones Carrillo vs M de Athayde |
| 1-0 | 30 | 1963 | Fortaleza Zonal | B28 Sicilian, O'Kelly Variation |
| 33. J F Olivera vs M de Athayde |
| 0-1 | 24 | 1963 | Fortaleza Zonal | E43 Nimzo-Indian, Fischer Variation |
| 34. M de Athayde vs S Schweber |
| ½-½ | 73 | 1963 | Fortaleza Zonal | E60 King's Indian Defense |
| 35. M de Athayde vs H Rossetto |
| 0-1 | 63 | 1963 | Fortaleza Zonal | D11 Queen's Gambit Declined Slav |
| 36. R Garcia vs M de Athayde |
| 0-1 | 42 | 1963 | Fortaleza Zonal | E69 King's Indian, Fianchetto, Classical Main line |
| 37. M de Athayde vs R Camara |
| 1-0 | 20 | 1963 | Fortaleza Zonal | A45 Queen's Pawn Game |
| 38. L de Campelo Gentil vs M de Athayde |
| ½-½ | 12 | 1963 | Fortaleza Zonal | A97 Dutch, Ilyin-Genevsky |
| 39. M de Athayde vs I Mendivil |
| ½-½ | 35 | 1963 | Fortaleza Zonal | C78 Ruy Lopez |
| 40. O Gadia vs M de Athayde |
| 0-1 | 59 | 1963 | Fortaleza Zonal | C26 Vienna |
| 41. H Camara vs M de Athayde |
| ½-½ | 69 | 1963 | Fortaleza Zonal | B28 Sicilian, O'Kelly Variation |
| 42. M de Athayde vs E German |
| 0-1 | 41 | 1964 | GB-MG match | D06 Queen's Gambit Declined |
| 43. E German vs M de Athayde |
| 1-0 | 38 | 1964 | GB-MG match | A07 King's Indian Attack |
| 44. M A Asfora vs M de Athayde |
| 1-0 | 56 | 1977 | Brazilian Championship | E00 Queen's Pawn Game |
| 45. R Filguth vs M de Athayde |
| 1-0 | 37 | 1977 | Brazilian Championship | B27 Sicilian |
| 46. M de Athayde vs D van Riemsdijk |
| 1-0 | 67 | 1977 | Brazilian Championship | A61 Benoni |
| 47. J Sunye Neto vs M de Athayde |
| 1-0 | 64 | 1977 | Brazilian Championship | A15 English |
| 48. M de Athayde vs A S Segal |
| 0-1 | 55 | 1977 | Brazilian Championship | A56 Benoni Defense |
| 49. J Soares Masculo vs M de Athayde |
| ½-½ | 86 | 1977 | Brazilian Championship | C65 Ruy Lopez, Berlin Defense |
| 50. M de Athayde vs H van Riemsdijk |
| 1-0 | 69 | 1977 | Brazilian Championship | A58 Benko Gambit |
Kibitzing
