| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Jens vs J Heltzel |
| 1-0 | 80 | 1999 | NED-ch U20 | C92 Ruy Lopez, Closed |
| 2. J Heltzel vs Stellwagen |
| 1-0 | 28 | 2000 | NED-ch U20 | C01 French, Exchange |
| 3. J Jens vs J Heltzel |
| 1-0 | 35 | 2001 | NED-ch U20 | B14 Caro-Kann, Panov-Botvinnik Attack |
| 4. M Solleveld vs J Heltzel |
| 1-0 | 58 | 2001 | Dieren op | B13 Caro-Kann, Exchange |
| 5. J Heltzel vs H van der Poel |
| 0-1 | 34 | 2001 | Dieren op | A48 King's Indian |
| 6. B de Jong-Muhren vs J Heltzel |
| 0-1 | 37 | 2001 | Dieren op | B13 Caro-Kann, Exchange |
| 7. J Heltzel vs J Algra |
| ½-½ | 21 | 2001 | Dieren op | A67 Benoni, Taimanov Variation |
| 8. C de Saegher vs J Heltzel |
| 1-0 | 27 | 2001 | Dieren op | E15 Queen's Indian |
| 9. J Heltzel vs L van Tol |
| 1-0 | 40 | 2001 | Dieren op | D40 Queen's Gambit Declined, Semi-Tarrasch |
| 10. X Wemmers vs J Heltzel |
| 1-0 | 41 | 2001 | Dieren op | A65 Benoni, 6.e4 |
| 11. J Heltzel vs D van Leent |
| ½-½ | 5 | 2001 | Dieren op | A51 Budapest Gambit |
| 12. J Heltzel vs M Smits |
| 1-0 | 41 | 2003 | Dutch Open | E99 King's Indian, Orthodox, Taimanov |
| 13. F Slingerland vs J Heltzel |
| ½-½ | 26 | 2003 | Dutch Open | B18 Caro-Kann, Classical |
| 14. J Heltzel vs J Geurink |
| 0-1 | 56 | 2003 | Dutch Open | E94 King's Indian, Orthodox |
| 15. J Heltzel vs T Willemze |
| ½-½ | 15 | 2003 | Dutch Open | B77 Sicilian, Dragon, Yugoslav Attack |
| 16. D van Leent vs J Heltzel |
| 1-0 | 54 | 2003 | Dutch Open | A20 English |
| 17. R van Helvoort vs J Heltzel |
| ½-½ | 49 | 2003 | Dutch Open | B13 Caro-Kann, Exchange |
| 18. J Heltzel vs A Schmitz |
| 1-0 | 45 | 2003 | Dutch Open | C01 French, Exchange |
| 19. O Wilgenhof vs J Heltzel |
| ½-½ | 61 | 2003 | Dutch Open | D02 Queen's Pawn Game |
| 20. J Heltzel vs T Struik |
| ½-½ | 11 | 2003 | Dutch Open | A35 English, Symmetrical |
| 21. J Heltzel vs V Deegens |
| 1-0 | 67 | 2003 | Vlissingen HZ Open | C01 French, Exchange |
| 22. S Meenakshi vs J Heltzel |
| ½-½ | 17 | 2003 | Vlissingen HZ Open | D02 Queen's Pawn Game |
| 23. J Heltzel vs G Fischdick |
| ½-½ | 16 | 2003 | Vlissingen HZ Open | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 24. A Huhndorf vs J Heltzel |
| ½-½ | 55 | 2003 | Vlissingen HZ Open | D02 Queen's Pawn Game |
| 25. J Heltzel vs E Oosterom |
| 1-0 | 45 | 2003 | Vlissingen HZ Open | B33 Sicilian |
Kibitzing
