| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. Z Kollen vs H Vedder |
| ½-½ | 42 | 2012 | 16th Unive Open | C09 French, Tarrasch, Open Variation, Main line |
| 27. H van der Poel vs Z Kollen |
| ½-½ | 69 | 2012 | 16th Unive Open | C17 French, Winawer, Advance |
| 28. Z Kollen vs D Kolodkin |
| ½-½ | 42 | 2013 | Unive Open | B90 Sicilian, Najdorf |
| 29. S Dijkhuis vs Z Kollen |
| 1-0 | 45 | 2013 | Unive Open | C05 French, Tarrasch |
| 30. B de Jonge vs Z Kollen |
| ½-½ | 57 | 2013 | Unive Open | C03 French, Tarrasch |
| 31. Z Kollen vs F Lesman |
| 1-0 | 41 | 2013 | Unive Open | B01 Scandinavian |
| 32. R Hoffman vs Z Kollen |
| 0-1 | 64 | 2013 | Unive Open | E77 King's Indian |
| 33. Z Kollen vs L van Kooten |
| 0-1 | 53 | 2013 | Unive Open | B48 Sicilian, Taimanov Variation |
| 34. L Piasetski vs Z Kollen |
| ½-½ | 24 | 2013 | Unive Open | E71 King's Indian, Makagonov System (5.h3) |
| 35. Z Kollen vs M den Hartog |
| 1-0 | 29 | 2013 | Unive Open | C11 French |
| 36. J Schroeder vs Z Kollen |
 | 1-0 | 26 | 2013 | Unive Open | C02 French, Advance |
| 37. M Bosboom vs Z Kollen |
| 1-0 | 30 | 2014 | TCh-NED Meesterklasse 2013-14 | A07 King's Indian Attack |
| 38. Z Kollen vs S Haslinger |
| 1-0 | 49 | 2015 | Dutch Open | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 39. Z Kollen vs D Reinderman |
| 0-1 | 40 | 2015 | Dutch Open | B28 Sicilian, O'Kelly Variation |
| 40. N Zwirs vs Z Kollen |
| ½-½ | 85 | 2015 | Dutch Open | D55 Queen's Gambit Declined |
| 41. Z Kollen vs T Beerdsen |
| 0-1 | 37 | 2015 | Dutch Open | B60 Sicilian, Richter-Rauzer |
| 42. G Bakker vs Z Kollen |
| ½-½ | 69 | 2015 | Dutch Open | E15 Queen's Indian |
| 43. Z Kollen vs A Mellema |
| 1-0 | 45 | 2015 | Dutch Open | C10 French |
| 44. Z Kollen vs J Boersma |
| 1-0 | 31 | 2015 | Dutch Open | B27 Sicilian |
| 45. R D Miedema vs Z Kollen |
| ½-½ | 49 | 2015 | Dutch Open | A14 English |
| 46. Z Kollen vs D Brandenburg |
| ½-½ | 111 | 2017 | NED-chT 2016/17 | B48 Sicilian, Taimanov Variation |
| 47. A van de Oudeweetering vs Z Kollen |
| ½-½ | 20 | 2017 | NED-chT 2016/17 | C01 French, Exchange |
| 48. Z Kollen vs T Maenhout |
| 1-0 | 39 | 2017 | NED-chT 2016/17 | B90 Sicilian, Najdorf |
| 49. L van Foreest vs Z Kollen |
| ½-½ | 38 | 2017 | Dutch Open | B33 Sicilian |
| 50. Z Kollen vs J Hilwerda |
| 1-0 | 72 | 2018 | Groningen Open | C84 Ruy Lopez, Closed |
Kibitzing
