| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. E Rinder vs C Vreeken |
| 1-0 | 84 | 1963 | Bad Neuenahr Zonal (Women) | A22 English |
| 27. C Vreeken vs A Brandler |
| 1-0 | 32 | 1963 | Bad Neuenahr Zonal (Women) | B07 Pirc |
| 28. C Vreeken vs A Sunnucks |
| 0-1 | 47 | 1963 | Bad Neuenahr Zonal (Women) | B20 Sicilian |
| 29. E Krizsan-Bilek vs C Vreeken |
| ½-½ | 66 | 1963 | Bad Neuenahr Zonal (Women) | A04 Reti Opening |
| 30. C Vreeken vs A Ivanova |
| 0-1 | 45 | 1963 | Bad Neuenahr Zonal (Women) | B07 Pirc |
| 31. M Lazarevic vs C Vreeken |
| 1-0 | 37 | 1963 | Bad Neuenahr Zonal (Women) | B49 Sicilian, Taimanov Variation |
| 32. C Vreeken vs P Ferrer Lucas |
| ½-½ | 44 | 1963 | Bad Neuenahr Zonal (Women) | C02 French, Advance |
| 33. H Axt vs C Vreeken |
| 1-0 | 48 | 1963 | Bad Neuenahr Zonal (Women) | A20 English |
| 34. C Vreeken vs K Blagojevic |
| 0-1 | 34 | 1963 | Bad Neuenahr Zonal (Women) | C02 French, Advance |
| 35. V Asenova vs C Vreeken |
| 0-1 | 33 | 1963 | Bad Neuenahr Zonal (Women) | B22 Sicilian, Alapin |
| 36. C Vreeken vs V Nedeljkovic |
| 0-1 | 51 | 1963 | Bad Neuenahr Zonal (Women) | B82 Sicilian, Scheveningen |
| 37. R M Bruce vs C Vreeken |
| ½-½ | 33 | 1963 | Bad Neuenahr Zonal (Women) | B46 Sicilian, Taimanov Variation |
| 38. C Vlagsma vs C Vreeken |
| ½-½ | 46 | 1965 | SK Paulsen Tournament | B21 Sicilian, 2.f4 and 2.d4 |
| 39. A Seppelt vs C Vreeken |
| 1-0 | 33 | 1965 | SK Paulsen Tournament | B43 Sicilian, Kan, 5.Nc3 |
| 40. C Vreeken vs U Kunsztowicz |
| 1-0 | 38 | 1965 | SK Paulsen Tournament | C44 King's Pawn Game |
| 41. W Mulkers vs C Vreeken |
| ½-½ | 24 | 1965 | SK Paulsen Tournament | B28 Sicilian, O'Kelly Variation |
| 42. C Vreeken vs M Bonne |
| 1-0 | 40 | 1965 | SK Paulsen Tournament | A07 King's Indian Attack |
| 43. A Speer vs C Vreeken |
| ½-½ | 29 | 1965 | SK Paulsen Tournament | B42 Sicilian, Kan |
| 44. C Vreeken vs R Mallee |
| 0-1 | 50 | 1965 | SK Paulsen Tournament | C44 King's Pawn Game |
| 45. N Gaprindashvili vs C Vreeken |
| 1-0 | 25 | 1966 | Belgrade (Women) | B43 Sicilian, Kan, 5.Nc3 |
| 46. C Vreeken vs H Konarkowska-Sokolov |
| 1-0 | 46 | 1966 | Arenys de Mar Zonal (Women) | B22 Sicilian, Alapin |
| 47. V Nedeljkovic vs C Vreeken |
| 1-0 | 38 | 1966 | Arenys de Mar Zonal (Women) | B42 Sicilian, Kan |
| 48. C Vreeken vs G Gresser |
| ½-½ | 46 | 1966 | Oberhausen Olympiad (Women) | C64 Ruy Lopez, Classical |
| 49. M Ager vs C Vreeken |
| 0-1 | 47 | 1966 | Oberhausen Olympiad (Women) | A52 Budapest Gambit |
| 50. C Vreeken vs A Sunnucks |
| 1-0 | 54 | 1966 | Oberhausen Olympiad (Women) | B22 Sicilian, Alapin |
Kibitzing
