| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Willemze vs J Fongers |
| 1-0 | 20 | 1993 | Hengelo op U14 | C44 King's Pawn Game |
| 2. T Vrenegoor vs J Willemze |
| ½-½ | 27 | 1994 | Haarlem AKN | B76 Sicilian, Dragon, Yugoslav Attack |
| 3. Barsov vs J Willemze |
| 1-0 | 37 | 1994 | Haarlem AKN | D45 Queen's Gambit Declined Semi-Slav |
| 4. S Ernst vs J Willemze |
| ½-½ | 56 | 1996 | NED-ch U20 | A01 Nimzovich-Larsen Attack |
| 5. V Gervais vs J Willemze |
| ½-½ | 64 | 1996 | Hengelo U20 | D52 Queen's Gambit Declined |
| 6. J Willemze vs I Starostits |
| 0-1 | 37 | 1996 | EU-ch U18 | B33 Sicilian |
| 7. J Willemze vs T Oral |
| 0-1 | 22 | 1996 | Hengelo U20 | B06 Robatsch |
| 8. J Willemze vs R Janssen |
| ½-½ | 29 | 1996 | Sonnevanck | B76 Sicilian, Dragon, Yugoslav Attack |
| 9. H Jonkman vs J Willemze |
| ½-½ | 51 | 1996 | Sonnevanck | B22 Sicilian, Alapin |
| 10. J Willemze vs D Reinderman |
| ½-½ | 28 | 1996 | Sonnevanck | B07 Pirc |
| 11. J Willemze vs J Delemarre |
| 0-1 | 44 | 1996 | Sonnevanck | A06 Reti Opening |
| 12. E Bricard vs J Willemze |
| ½-½ | 29 | 1996 | Sonnevanck | A06 Reti Opening |
| 13. J Willemze vs S Loeffler |
| 1-0 | 33 | 1996 | Sonnevanck | B89 Sicilian |
| 14. P Claesen vs J Willemze |
| ½-½ | 28 | 1996 | Sonnevanck | B10 Caro-Kann |
| 15. J Willemze vs I Rogers |
| 0-1 | 58 | 1996 | Sonnevanck | B49 Sicilian, Taimanov Variation |
| 16. J E Armas Gutierrez vs J Willemze |
| ½-½ | 21 | 1996 | Sonnevanck | B22 Sicilian, Alapin |
| 17. Y Visser vs J Willemze |
| 1-0 | 29 | 1996 | Groningen Open | B12 Caro-Kann Defense |
| 18. J Willemze vs Adorjan |
| ½-½ | 47 | 1996 | Groningen Open | B90 Sicilian, Najdorf |
| 19. J Willemze vs M Klinova |
| 0-1 | 20 | 1996 | Groningen Open | B07 Pirc |
| 20. J Willemze vs S Ernst |
| ½-½ | 22 | 1997 | NED-ch U18 | D00 Queen's Pawn Game |
| 21. H Ree vs J Willemze |
| 1-0 | 55 | 1997 | Lost Boys Open | D10 Queen's Gambit Declined Slav |
| 22. P Tregubov vs J Willemze |
| 1-0 | 40 | 1997 | Groningen Open | D11 Queen's Gambit Declined Slav |
| 23. J Willemze vs T Barendse |
| ½-½ | 46 | 1997 | Groningen Open | A46 Queen's Pawn Game |
| 24. J Blokhuis vs J Willemze |
| 1-0 | 35 | 1997 | Groningen Open | B76 Sicilian, Dragon, Yugoslav Attack |
| 25. A Tennstedt vs J Willemze |
| 1-0 | 14 | 1997 | Groningen Open | D11 Queen's Gambit Declined Slav |
Kibitzing
