| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. Pilnik vs B De Greiff |
| ½-½ | 65 | 1955 | Mar del Plata | C75 Ruy Lopez, Modern Steinitz Defense |
| 27. Pachman vs B De Greiff |
| 1-0 | 51 | 1955 | Mar del Plata | E14 Queen's Indian |
| 28. B De Greiff vs L Bauza |
| 0-1 | 36 | 1955 | Mar del Plata | B53 Sicilian |
| 29. E Dodero vs B De Greiff |
| 0-1 | 43 | 1955 | Mar del Plata | E10 Queen's Pawn Game |
| 30. B De Greiff vs Letelier |
| ½-½ | 29 | 1955 | Mar del Plata | C15 French, Winawer |
| 31. B Wexler vs B De Greiff |
| 1-0 | 50 | 1955 | Mar del Plata | A07 King's Indian Attack |
| 32. B De Greiff vs Gligoric |
 | 0-1 | 35 | 1955 | Mar del Plata | B93 Sicilian, Najdorf, 6.f4 |
| 33. G Idigoras vs B De Greiff |
| 0-1 | 45 | 1955 | Mar del Plata | E19 Queen's Indian, Old Main line, 9.Qxc3 |
| 34. B De Greiff vs Szabo |
| 0-1 | 56 | 1955 | Mar del Plata | B64 Sicilian, Richter-Rauzer Attack |
| 35. B De Greiff vs O Troianescu |
| ½-½ | 24 | 1956 | Moscow Olympiad qual-4 | C02 French, Advance |
| 36. G Szilagyi vs B De Greiff |
| 0-1 | 32 | 1956 | Moscow Olympiad qual-4 | A15 English |
| 37. B De Greiff vs P Limbos |
| 1-0 | 49 | 1956 | Moscow Olympiad qual-4 | C79 Ruy Lopez, Steinitz Defense Deferred |
| 38. A Navabi vs B De Greiff |
| ½-½ | 41 | 1956 | Moscow Olympiad qual-4 | A04 Reti Opening |
| 39. B De Greiff vs A Anastasopoulos |
| 1-0 | 29 | 1956 | Moscow Olympiad qual-4 | E80 King's Indian, Samisch Variation |
| 40. L Herrmann vs B De Greiff |
| ½-½ | 34 | 1956 | Moscow Olympiad qual-4 | E41 Nimzo-Indian |
| 41. B De Greiff vs J Sefc |
| ½-½ | 20 | 1956 | Moscow Olympiad qual-4 | A13 English |
| 42. C Benitez vs B De Greiff |
| 1-0 | 50 | 1956 | Moscow Olympiad qual-4 | B00 Uncommon King's Pawn Opening |
| 43. B De Greiff vs C Jauregui |
| ½-½ | 40 | 1956 | Moscow Olympiad Final-B | C09 French, Tarrasch, Open Variation, Main line |
| 44. W J Muhring vs B De Greiff |
| ½-½ | 20 | 1956 | Moscow Olympiad Final-B | E00 Queen's Pawn Game |
| 45. B De Greiff vs M Joffe |
| 0-1 | 56 | 1956 | Moscow Olympiad Final-B | B63 Sicilian, Richter-Rauzer Attack |
| 46. Y Barda vs B De Greiff |
| 0-1 | 34 | 1956 | Moscow Olympiad Final-B | C75 Ruy Lopez, Modern Steinitz Defense |
| 47. B De Greiff vs R Dworzynski |
| 1-0 | 33 | 1956 | Moscow Olympiad Final-B | C77 Ruy Lopez |
| 48. G Noradounghian vs B De Greiff |
| ½-½ | 18 | 1956 | Moscow Olympiad Final-B | C48 Four Knights |
| 49. B De Greiff vs A Kinzel |
| 1-0 | 23 | 1956 | Moscow Olympiad Final-B | B33 Sicilian |
| 50. M Rantanen vs B De Greiff |
| ½-½ | 68 | 1956 | Moscow Olympiad Final-B | E92 King's Indian |
Kibitzing
