| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. H Perez Garcia vs W Heemskerk |
| 1-0 | 42 | 1982 | Haarlem | C00 French Defense |
| 2. M de Wit vs W Heemskerk |
| 0-1 | 25 | 1985 | Dutch Open | B22 Sicilian, Alapin |
| 3. W Heemskerk vs D H Campora |
| 0-1 | 37 | 1985 | Dutch Open | D17 Queen's Gambit Declined Slav |
| 4. Y Visser vs W Heemskerk |
| 1-0 | 33 | 1985 | Dutch Open | A07 King's Indian Attack |
| 5. W Heemskerk vs M Landtman |
| 1-0 | 32 | 1985 | Dutch Open | D34 Queen's Gambit Declined, Tarrasch |
| 6. W Heemskerk vs R Douven |
| ½-½ | 52 | 1989 | Groningen Open | A29 English, Four Knights, Kingside Fianchetto |
| 7. B Kohlweyer vs W Heemskerk |
| 1-0 | 45 | 1989 | Groningen Open | E32 Nimzo-Indian, Classical |
| 8. I Stohl vs W Heemskerk |
| 1-0 | 26 | 1989 | Groningen Open | E32 Nimzo-Indian, Classical |
| 9. W Heemskerk vs E Ermenkov |
| 0-1 | 36 | 1989 | Groningen Open | A29 English, Four Knights, Kingside Fianchetto |
| 10. C Joecks vs W Heemskerk |
| 1-0 | 28 | 1989 | Groningen Open | B40 Sicilian |
| 11. W Heemskerk vs G Pieterse |
| 0-1 | 51 | 1989 | Groningen Open | E99 King's Indian, Orthodox, Taimanov |
| 12. W Heemskerk vs L Zimmermann |
| ½-½ | 41 | 2003 | Dutch Open | A20 English |
| 13. J van Rosmalen vs W Heemskerk |
| ½-½ | 59 | 2003 | Dutch Open | B43 Sicilian, Kan, 5.Nc3 |
| 14. W Heemskerk vs M Bensdorp-De Labaca |
| ½-½ | 22 | 2003 | Dutch Open | A09 Reti Opening |
| 15. M Tan vs W Heemskerk |
| ½-½ | 27 | 2003 | Dutch Open | B02 Alekhine's Defense |
| 16. W Heemskerk vs M Boel |
| 1-0 | 68 | 2003 | Dutch Open | E17 Queen's Indian |
| 17. D Hamelink vs W Heemskerk |
| ½-½ | 18 | 2003 | Dutch Open | C07 French, Tarrasch |
| 18. W Heemskerk vs W Muhren |
| ½-½ | 64 | 2003 | Dutch Open | A16 English |
| 19. J R Markus vs W Heemskerk |
| 0-1 | 67 | 2003 | Dutch Open | A46 Queen's Pawn Game |
| 20. E Belle vs W Heemskerk |
| 1-0 | 34 | 2004 | Groningen op-A | A20 English |
| 21. Ftacnik vs W Heemskerk |
| 1-0 | 39 | 2006 | Amsterdam Chess Tournament | D15 Queen's Gambit Declined Slav |
| 22. W Heemskerk vs A Moll |
| ½-½ | 50 | 2006 | Amsterdam Chess Tournament | D34 Queen's Gambit Declined, Tarrasch |
| 23. A Bachofner vs W Heemskerk |
| ½-½ | 14 | 2006 | Amsterdam Chess Tournament | A06 Reti Opening |
| 24. W Heemskerk vs T Zhang |
| ½-½ | 27 | 2006 | Amsterdam Chess Tournament | A46 Queen's Pawn Game |
| 25. P Doggers vs W Heemskerk |
 | 1-0 | 43 | 2006 | Amsterdam Chess Tournament | C10 French |
Kibitzing
