| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Mangini vs M Bawden |
| 1-0 | 21 | 1950 | Brazilian Championship | B40 Sicilian |
| 27. J Mangini vs F Vasconcellos |
| 1-0 | 30 | 1950 | Brazilian Championship | C91 Ruy Lopez, Closed |
| 28. E German vs J Mangini |
| 0-1 | 39 | 1951 | Punta del Este 1951/52 | E16 Queen's Indian |
| 29. J Mangini vs R Toran |
| 0-1 | 47 | 1951 | Punta del Este 1951/52 | B10 Caro-Kann |
| 30. J Mangini vs L Roux Cabral |
| 0-1 | 36 | 1951 | Punta del Este 1951/52 | C43 Petrov, Modern Attack |
| 31. M A Muniz Jr vs J Mangini |
| 0-1 | 31 | 1951 | Punta del Este 1951/52 | A13 English |
| 32. W Ader Hausman vs J Mangini |
| 1-0 | 41 | 1951 | Punta del Este 1951/52 | D15 Queen's Gambit Declined Slav |
| 33. Eliskases vs J Mangini |
| ½-½ | 71 | 1951 | Punta del Este 1951/52 | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 34. W Estrada Degrandi vs J Mangini |
| 1-0 | 49 | 1951 | Punta del Este 1951/52 | B93 Sicilian, Najdorf, 6.f4 |
| 35. Letelier vs J Mangini |
| 1-0 | 31 | 1951 | Punta del Este 1951/52 | B21 Sicilian, 2.f4 and 2.d4 |
| 36. H Corral vs J Mangini |
| 1-0 | 15 | 1951 | Punta del Este 1951/52 | D51 Queen's Gambit Declined |
| 37. J Mangini vs J Canepa |
| 1-0 | 43 | 1951 | Punta del Este 1951/52 | B57 Sicilian |
| 38. J Mangini vs R Linskens |
| 1-0 | 24 | 1951 | Punta del Este 1951/52 | B05 Alekhine's Defense, Modern |
| 39. J Mangini vs L Bauza |
| 0-1 | 84 | 1951 | Punta del Este 1951/52 | B57 Sicilian |
| 40. J Mangini vs M Luckis |
 | ½-½ | 42 | 1951 | Mar del Plata Zonal | B57 Sicilian |
| 41. L Marini vs J Mangini |
| 1-0 | 29 | 1951 | Mar del Plata Zonal | D15 Queen's Gambit Declined Slav |
| 42. J Mangini vs F Pinzon |
| 0-1 | 26 | 1951 | Mar del Plata Zonal | B57 Sicilian |
| 43. Bolbochan vs J Mangini |
| 1-0 | 72 | 1951 | Mar del Plata Zonal | C91 Ruy Lopez, Closed |
| 44. J Mangini vs J Sumar |
| 1-0 | 42 | 1951 | Mar del Plata Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
| 45. A Esposito vs J Mangini |
| 1-0 | 57 | 1951 | Mar del Plata Zonal | D19 Queen's Gambit Declined Slav, Dutch |
| 46. J Mangini vs B Wexler |
| ½-½ | 56 | 1951 | Mar del Plata Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
| 47. Eliskases vs J Mangini |
| 1-0 | 39 | 1951 | Mar del Plata Zonal | A07 King's Indian Attack |
| 48. J Mangini vs C Guimard |
 | ½-½ | 42 | 1951 | Mar del Plata Zonal | C04 French, Tarrasch, Guimard Main line |
| 49. P Martin vs J Mangini |
| ½-½ | 18 | 1951 | Mar del Plata Zonal | D19 Queen's Gambit Declined Slav, Dutch |
| 50. J Mangini vs J Bolbochan |
| 0-1 | 58 | 1951 | Mar del Plata Zonal | C75 Ruy Lopez, Modern Steinitz Defense |
Kibitzing
