| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. Najdorf vs R Cantero |
 | 1-0 | 44 | 1956 | Montevideo | E60 King's Indian Defense |
| 27. R Cantero vs W Ader Hausman |
| 1-0 | 48 | 1956 | Montevideo | B32 Sicilian |
| 28. L Bauza vs R Cantero |
| ½-½ | 21 | 1956 | Montevideo | A46 Queen's Pawn Game |
| 29. R Cantero vs F Rubio Aguado |
| 0-1 | 35 | 1957 | Rio de Janeiro Zonal | E67 King's Indian, Fianchetto |
| 30. Panno vs R Cantero |
| 1-0 | 45 | 1957 | Rio de Janeiro Zonal | E64 King's Indian, Fianchetto, Yugoslav System |
| 31. L de Campelo Gentil vs R Cantero |
| 1-0 | 41 | 1957 | Rio de Janeiro Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
| 32. Najdorf vs R Cantero |
| 0-1 | 43 | 1957 | Rio de Janeiro Zonal | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 33. R Cantero vs W O Cruz |
| ½-½ | 73 | 1957 | Rio de Janeiro Zonal | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 34. R Cantero vs J Perez Alcocer |
| 1-0 | 42 | 1957 | Rio de Janeiro Zonal | E15 Queen's Indian |
| 35. H Rossetto vs R Cantero |
| ½-½ | 32 | 1957 | Rio de Janeiro Zonal | E80 King's Indian, Samisch Variation |
| 36. R Cantero vs Letelier |
| 1-0 | 39 | 1957 | Rio de Janeiro Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
| 37. R Cantero vs R Sanguineti |
| ½-½ | 20 | 1957 | Rio de Janeiro Zonal | C84 Ruy Lopez, Closed |
| 38. R Cantero vs A Esposito |
| 0-1 | 34 | 1957 | Rio de Janeiro Zonal | C19 French, Winawer, Advance |
| 39. L Engels vs R Cantero |
| 1-0 | 71 | 1957 | Rio de Janeiro Zonal | B94 Sicilian, Najdorf |
| 40. C Humerez Estrada vs R Cantero |
| ½-½ | 49 | 1957 | Rio de Janeiro Zonal | B98 Sicilian, Najdorf |
| 41. M Madeira de Ley vs R Cantero |
| 1-0 | 64 | 1957 | Rio de Janeiro Zonal | E85 King's Indian, Samisch, Orthodox Variation |
| 42. J Mangini vs R Cantero |
| 0-1 | 49 | 1957 | Rio de Janeiro Zonal | B98 Sicilian, Najdorf |
| 43. R Cantero vs L Tavares da Silva |
| 1-0 | 32 | 1957 | Rio de Janeiro Zonal | E64 King's Indian, Fianchetto, Yugoslav System |
| 44. H Rossetto vs R Cantero |
| 1-0 | 45 | 1957 | Sao Paulo | A53 Old Indian |
| 45. R Cantero vs Najdorf |
| 0-1 | 39 | 1957 | Sao Paulo | C44 King's Pawn Game |
| 46. R Cantero vs G Doucas |
| 1-0 | 24 | 1957 | Sao Paulo | A53 Old Indian |
| 47. M Eidelman vs R Cantero |
| 0-1 | 31 | 1957 | Sao Paulo | B95 Sicilian, Najdorf, 6...e6 |
| 48. R Cantero vs L Engels |
| 1-0 | 46 | 1957 | Sao Paulo | D37 Queen's Gambit Declined |
| 49. J Hollmann vs R Cantero |
| 1-0 | 46 | 1957 | Sao Paulo | B32 Sicilian |
| 50. R Cantero vs J Zacharias |
| 1-0 | 35 | 1957 | Sao Paulo | E80 King's Indian, Samisch Variation |
Kibitzing
