| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Willemze vs V Valens |
| 1-0 | 39 | 1997 | Groningen Open | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 27. M Spierings vs J Willemze |
| 0-1 | 38 | 1997 | Groningen Open | D12 Queen's Gambit Declined Slav |
| 28. A Keessen vs J Willemze |
| ½-½ | 18 | 1998 | NED-ch U20 | A57 Benko Gambit |
| 29. J Willemze vs D Anagnostopoulos |
| 0-1 | 27 | 1998 | Cappelle-la-Grande Open | B76 Sicilian, Dragon, Yugoslav Attack |
| 30. L van Beek vs J Willemze |
| ½-½ | 24 | 1998 | Dutch Open | A07 King's Indian Attack |
| 31. J Willemze vs Mikhalevski |
| 0-1 | 29 | 1998 | Dutch Open | C49 Four Knights |
| 32. T Vakhidov vs J Willemze |
| ½-½ | 35 | 1998 | Dutch Open | D12 Queen's Gambit Declined Slav |
| 33. J Willemze vs D de Vreugt |
| 1-0 | 69 | 1998 | Dutch Open | B42 Sicilian, Kan |
| 34. A Berelowitsch vs J Willemze |
| 1-0 | 57 | 1998 | Dutch Open | B01 Scandinavian |
| 35. J Willemze vs K van der Weide |
| ½-½ | 20 | 1998 | Dutch Open | B32 Sicilian |
| 36. J Willemze vs E Anka |
| 1-0 | 25 | 1998 | Dutch Open | B72 Sicilian, Dragon |
| 37. T Dekker vs J Willemze |
| 0-1 | 33 | 1998 | Dutch Open | D04 Queen's Pawn Game |
| 38. J Willemze vs V Meijers |
| 0-1 | 42 | 1998 | Dutch Open | C42 Petrov Defense |
| 39. M van Halteren vs J Willemze |
| 0-1 | 31 | 1998 | Hogeschool Zeeland Open | D10 Queen's Gambit Declined Slav |
| 40. J Willemze vs A van Haaften |
 | 1-0 | 47 | 1998 | Hogeschool Zeeland Open | B07 Pirc |
| 41. V Golod vs J Willemze |
| ½-½ | 68 | 1998 | Hogeschool Zeeland Open | D19 Queen's Gambit Declined Slav, Dutch |
| 42. J Willemze vs I Rausis |
| ½-½ | 42 | 1998 | Hogeschool Zeeland Open | B12 Caro-Kann Defense |
| 43. D van der Lijn vs J Willemze |
| ½-½ | 45 | 1998 | Hogeschool Zeeland Open | D00 Queen's Pawn Game |
| 44. J Willemze vs S Strothotte |
| ½-½ | 35 | 1998 | Hogeschool Zeeland Open | B08 Pirc, Classical |
| 45. H Groffen vs J Willemze |
| 0-1 | 27 | 1998 | Hogeschool Zeeland Open | A57 Benko Gambit |
| 46. S Sulskis vs J Willemze |
| ½-½ | 71 | 1998 | Groningen Open | A02 Bird's Opening |
| 47. J Willemze vs L van Kooten |
| 1-0 | 32 | 1998 | Groningen Open | B80 Sicilian, Scheveningen |
| 48. S Skembris vs J Willemze |
| 1-0 | 30 | 1999 | Cappelle Open | D11 Queen's Gambit Declined Slav |
| 49. J Willemze vs G Molinari |
| 1-0 | 29 | 1999 | Dutch Open | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 50. S Ernst vs J Willemze |
| ½-½ | 19 | 1999 | Dutch Open | A06 Reti Opening |
Kibitzing
