| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Mangini vs J Sumar |
| 1-0 | 42 | 1951 | Mar del Plata Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
| 2. J Mangini vs B Wexler |
| ½-½ | 56 | 1951 | Mar del Plata Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
| 3. E German vs J Mangini |
| 0-1 | 35 | 1951 | Brazilian Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 4. J Mangini vs L de Campelo Gentil |
| 0-1 | 55 | 1951 | Brazilian Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 5. W Santa Cruz vs J Mangini |
| 1-0 | 34 | 1954 | Brazilian Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 6. J Mangini vs L Tavares da Silva |
| ½-½ | 65 | 1957 | BRA-ch24 | B92 Sicilian, Najdorf, Opocensky Variation |
| 7. J Mangini vs Najdorf |
| 0-1 | 26 | 1957 | Mar del Plata | B92 Sicilian, Najdorf, Opocensky Variation |
| 8. M Berenzon vs J Mangini |
| 0-1 | 25 | 1959 | Brazilian Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 9. J Mangini vs Szabo |
| 0-1 | 43 | 1960 | Asuncion | B92 Sicilian, Najdorf, Opocensky Variation |
| 10. J Mangini vs T Vasconcellos |
| 1-0 | 65 | 1963 | Brazilian Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 11. Stein vs J Mangini |
| 1-0 | 31 | 1965 | Rio IV Centenario | B92 Sicilian, Najdorf, Opocensky Variation |
Kibitzing
