| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. O Rocas vs C Hounie Fleurquin |
| 0-1 | 47 | 1946 | Mar del Plata | A07 King's Indian Attack |
| 27. Letelier vs O Rocas |
| 1-0 | 41 | 1946 | Mar del Plata | E21 Nimzo-Indian, Three Knights |
| 28. O Rocas vs C H Maderna |
 | 1-0 | 41 | 1946 | Mar del Plata | A03 Bird's Opening |
| 29. C J Corte vs O Rocas |
| 1-0 | 39 | 1946 | Mar del Plata | B14 Caro-Kann, Panov-Botvinnik Attack |
| 30. O Rocas vs J de Souza Mendes |
| ½-½ | 50 | 1946 | Mar del Plata | C68 Ruy Lopez, Exchange |
| 31. M Luckis vs O Rocas |
| ½-½ | 35 | 1946 | Mar del Plata | A44 Old Benoni Defense |
| 32. O Rocas vs L Bauza |
| ½-½ | 25 | 1946 | Mar del Plata | B83 Sicilian |
| 33. C Guimard vs O Rocas |
| 1-0 | 37 | 1946 | Mar del Plata | A46 Queen's Pawn Game |
| 34. O Rocas vs J Traian Iliesco |
| ½-½ | 31 | 1946 | Mar del Plata | A02 Bird's Opening |
| 35. Stahlberg vs O Rocas |
| ½-½ | 56 | 1946 | Mar del Plata | E21 Nimzo-Indian, Three Knights |
| 36. O Rocas vs E Reinhardt |
| 0-1 | 41 | 1946 | Mar del Plata | A03 Bird's Opening |
| 37. P Michel vs O Rocas |
| 1-0 | 32 | 1946 | Mar del Plata | B11 Caro-Kann, Two Knights, 3...Bg4 |
| 38. O Rocas vs R Garcia Vera |
| 1-0 | 57 | 1946 | Mar del Plata | C68 Ruy Lopez, Exchange |
| 39. Pilnik vs O Rocas |
| 1-0 | 64 | 1946 | Mar del Plata | B18 Caro-Kann, Classical |
| 40. O Rocas vs R Sanguinetti |
| ½-½ | 57 | 1946 | Mar del Plata | B13 Caro-Kann, Exchange |
| 41. J Bolbochan vs O Rocas |
| ½-½ | 22 | 1946 | Mar del Plata | E43 Nimzo-Indian, Fischer Variation |
| 42. N Dantas vs O Rocas |
| 0-1 | 20 | 1948 | Rio de Janeiro | C07 French, Tarrasch |
| 43. O Rocas vs O'Kelly |
| 0-1 | 43 | 1948 | Rio de Janeiro | B23 Sicilian, Closed |
Kibitzing
