| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. H van Riemsdijk vs P Garcia Toledo |
| ½-½ | 12 | 1969 | Mar del Plata Zonal | C00 French Defense |
| 27. Najdorf vs H van Riemsdijk |
| 1-0 | 30 | 1969 | Mar del Plata Zonal | A29 English, Four Knights, Kingside Fianchetto |
| 28. H van Riemsdijk vs Quinteros |
 | 0-1 | 54 | 1969 | Mar del Plata Zonal | B27 Sicilian |
| 29. O Rodriguez Vargas vs H van Riemsdijk |
| 1-0 | 38 | 1969 | Mar del Plata Zonal | D37 Queen's Gambit Declined |
| 30. H van Riemsdijk vs R Garcia |
| 0-1 | 29 | 1969 | Mar del Plata Zonal | C19 French, Winawer, Advance |
| 31. S Schweber vs H van Riemsdijk |
| ½-½ | 54 | 1969 | Mar del Plata Zonal | A29 English, Four Knights, Kingside Fianchetto |
| 32. H van Riemsdijk vs Mecking |
| 0-1 | 19 | 1969 | Mar del Plata Zonal | B06 Robatsch |
| 33. H Rossetto vs H van Riemsdijk |
| ½-½ | 42 | 1969 | Mar del Plata Zonal | B33 Sicilian |
| 34. H van Riemsdijk vs J L Alvarez del Monte |
| 1-0 | 34 | 1969 | Mar del Plata Zonal | C91 Ruy Lopez, Closed |
| 35. H van Riemsdijk vs J Rubinetti |
| 1-0 | 49 | 1969 | Mar del Plata Zonal | B45 Sicilian, Taimanov |
| 36. H van Riemsdijk vs Panno |
| 0-1 | 23 | 1969 | Mar del Plata Zonal | B56 Sicilian |
| 37. H van Riemsdijk vs L Bronstein |
| ½-½ | 60 | 1969 | Mar del Plata Zonal | C91 Ruy Lopez, Closed |
| 38. I Mendivil vs H van Riemsdijk |
| 0-1 | 30 | 1969 | Mar del Plata Zonal | C55 Two Knights Defense |
| 39. H van Riemsdijk vs C Silva Sanchez |
| 1-0 | 24 | 1969 | Mar del Plata Zonal | B15 Caro-Kann |
| 40. H van Riemsdijk vs J Ladeira |
| 1-0 | 47 | 1969 | Brazilian Championship | B86 Sicilian, Fischer-Sozin Attack |
| 41. H van Riemsdijk vs F Trois |
| ½-½ | 48 | 1969 | Brazilian Championship | C91 Ruy Lopez, Closed |
| 42. H van Riemsdijk vs H Camara |
| 0-1 | 27 | 1969 | Brazilian Championship | B28 Sicilian, O'Kelly Variation |
| 43. A C Rocha vs H van Riemsdijk |
| 1-0 | 47 | 1969 | Brazilian Championship | D47 Queen's Gambit Declined Semi-Slav |
| 44. J Szmetan vs H van Riemsdijk |
| 1-0 | 26 | 1970 | Mar del Plata op | B43 Sicilian, Kan, 5.Nc3 |
| 45. H van Riemsdijk vs L Alberto Pires |
| 0-1 | 25 | 1970 | Sao Paulo State Championship | B90 Sicilian, Najdorf |
| 46. H van Riemsdijk vs H Camara |
| 1-0 | 31 | 1970 | 37th Brazilian Championship | B06 Robatsch |
| 47. A Medina Garcia vs H van Riemsdijk |
| 0-1 | 38 | 1971 | Van Riemsdijk - Medina | B07 Pirc |
| 48. A Medina Garcia vs H van Riemsdijk |
| 1-0 | 39 | 1971 | Van Riemsdijk - Medina | B45 Sicilian, Taimanov |
| 49. H van Riemsdijk vs A Medina Garcia |
| 0-1 | 45 | 1971 | Van Riemsdijk - Medina | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 50. H van Riemsdijk vs A Medina Garcia |
| 1-0 | 41 | 1971 | Van Riemsdijk - Medina | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
Kibitzing
