| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. M De Freitas vs Szabo |
| 1-0 | 41 |
1948 |
Mar del Plata | E15 Queen's Indian |
| 2. M De Freitas vs Najdorf |
| 0-1 | 31 |
1948 |
Mar del Plata | E67 King's Indian, Fianchetto |
| 3. M De Freitas vs Rossolimo |
| ½-½ | 50 |
1950 |
Mar del Plata | A53 Old Indian |
| 4. M Czerniak vs M De Freitas |
| 1-0 | 52 |
1950 |
It Mar del Plata | C47 Four Knights |
| 5. M De Freitas vs Gligoric |
| 0-1 | 36 |
1950 |
Mar del Plata | C07 French, Tarrasch |
| 6. M De Freitas vs R Sanguineti |
| ½-½ | 34 |
1950 |
Mar del Plata | E06 Catalan, Closed, 5.Nf3 |
| 7. P Michel vs M De Freitas |
 | ½-½ | 32 |
1950 |
Mar del Plata | C29 Vienna Gambit |
| 8. E Eliskases vs M De Freitas |
| 1-0 | 31 |
1950 |
Mar del Plata | A46 Queen's Pawn Game |
| 9. F Vasconcellos vs M De Freitas |
| 0-1 | 56 |
1952 |
Sao Paulo | B93 Sicilian, Najdorf, 6.f4 |
| 10. R Sanguineti vs M De Freitas |
| 1-0 | 54 |
1957 |
Sao Paulo | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 11. M De Freitas vs J Hollmann |
 | 1-0 | 15 |
1957 |
Sao Paulo | C25 Vienna |
| 12. R Cantero vs M De Freitas |
| 1-0 | 44 |
1957 |
Sao Paulo | A11 English, Caro-Kann Defensive System |
| 13. M De Freitas vs Najdorf |
 | 0-1 | 22 |
1957 |
Sao Paulo | B37 Sicilian, Accelerated Fianchetto |
| 14. J Zacharias vs M De Freitas |
| 0-1 | 46 |
1957 |
Sao Paulo | E87 King's Indian, Samisch, Orthodox |
| 15. J Ducas vs M De Freitas |
| 1-0 | 42 |
1957 |
Sao Paulo | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 16. M De Freitas vs R Lisboa |
 | 1-0 | 21 |
1957 |
Sao Paulo | B06 Robatsch |
| 17. M De Freitas vs M Eidelman |
| 1-0 | 31 |
1957 |
Sao Paulo | B95 Sicilian, Najdorf, 6...e6 |
| 18. M De Freitas vs F Rubio Aguado |
| 0-1 | 39 |
1957 |
Sao Paulo | A00 Uncommon Opening |
| 19. M De Freitas vs H Rossetto |
| 0-1 | 42 |
1957 |
Sao Paulo | B33 Sicilian |
| 20. L Engels vs M De Freitas |
| ½-½ | 47 |
1957 |
Sao Paulo | B14 Caro-Kann, Panov-Botvinnik Attack |
| 21. M De Freitas vs Laercio Maragliano |
| 1-0 | 31 |
1958 |
Sao Paulo | A00 Uncommon Opening |
| 22. M De Freitas vs O Gadia |
| 1-0 | 37 |
1964 |
BRA-ch | A43 Old Benoni |
| 23. Mecking vs M De Freitas |
| ½-½ | 32 |
1965 |
BRA-ch 32th | C58 Two Knights |