| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Belfort Mattos vs H Camara |
| ½-½ | 20 | 1963 | Brazilian Championship | D25 Queen's Gambit Accepted |
| 2. F Alves vs J Belfort Mattos |
| 0-1 | 53 | 1963 | Brazilian Championship | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 3. J Belfort Mattos vs F Guimaraes |
| 1-0 | 29 | 1963 | Brazilian Championship | C02 French, Advance |
| 4. E Asfora vs J Belfort Mattos |
| 0-1 | 35 | 1963 | Brazilian Championship | A17 English |
| 5. J Belfort Mattos vs J de Souza Mendes |
| 1-0 | 35 | 1963 | Brazilian Championship | B32 Sicilian |
| 6. J Pinto Paiva vs J Belfort Mattos |
| 1-0 | 28 | 1963 | Brazilian Championship | B23 Sicilian, Closed |
| 7. J Belfort Mattos vs L Tavares da Silva |
| 0-1 | 54 | 1963 | Brazilian Championship | E83 King's Indian, Samisch |
| 8. A C Rocha vs J Belfort Mattos |
| ½-½ | 38 | 1963 | Brazilian Championship | B18 Caro-Kann, Classical |
| 9. J Belfort Mattos vs L Maia Filho |
| 1-0 | 32 | 1963 | Brazilian Championship | E85 King's Indian, Samisch, Orthodox Variation |
| 10. M de Athayde vs J Belfort Mattos |
| ½-½ | 37 | 1963 | Brazilian Championship | B42 Sicilian, Kan |
| 11. J Belfort Mattos vs J Mangini |
| ½-½ | 55 | 1963 | Brazilian Championship | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 12. J Belfort Mattos vs T Vasconcellos |
| 1-0 | 38 | 1963 | Brazilian Championship | B32 Sicilian |
| 13. M Tavares vs J Belfort Mattos |
| 0-1 | 38 | 1963 | Brazilian Championship | A07 King's Indian Attack |
| 14. P Toth vs J Belfort Mattos |
| 1-0 | 24 | 1963 | Brazilian Championship | C29 Vienna Gambit |
| 15. J F de Saboya vs J Belfort Mattos |
| ½-½ | 26 | 1963 | Brazilian Championship | D92 Grunfeld, 5.Bf4 |
| 16. L Engels vs J Belfort Mattos |
| ½-½ | 26 | 1963 | CXSP ch | B10 Caro-Kann |
| 17. J Belfort Mattos vs E Serra |
| 1-0 | 54 | 1984 | Brazilian Championship | D45 Queen's Gambit Declined Semi-Slav |
| 18. H van Riemsdijk vs J Belfort Mattos |
| 1-0 | 31 | 1984 | Brazilian Championship | C80 Ruy Lopez, Open |
| 19. J Belfort Mattos vs M Moennich |
| 1-0 | 39 | 1984 | Brazilian Championship | E94 King's Indian, Orthodox |
| 20. F Trois vs J Belfort Mattos |
| 1-0 | 46 | 1984 | Brazilian Championship | A61 Benoni |
| 21. J Belfort Mattos vs P C de Souza Haro |
| 0-1 | 33 | 1984 | Brazilian Championship | A49 King's Indian, Fianchetto without c4 |
| 22. E Ticianeli vs J Belfort Mattos |
| ½-½ | 58 | 1984 | Brazilian Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 23. J Belfort Mattos vs A Valle |
| 1-0 | 48 | 1984 | Brazilian Championship | C19 French, Winawer, Advance |
| 24. J C de Castro Rocha vs J Belfort Mattos |
| 1-0 | 42 | 1984 | Brazilian Championship | A07 King's Indian Attack |
| 25. J Belfort Mattos vs E L de Assis Pereira |
| 0-1 | 48 | 1984 | Brazilian Championship | C89 Ruy Lopez, Marshall |
Kibitzing
