| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Harmsen vs B Shabazz |
| 0-1 | 34 | 1981 | Wch u16g | C30 King's Gambit Declined |
| 2. S Polgar vs J Harmsen |
| 1-0 | 24 | 1981 | Wch u16g | A87 Dutch, Leningrad, Main Variation |
| 3. E Belle vs J Harmsen |
| 1-0 | 24 | 1985 | Amsterdam pre zt (Woman) | C16 French, Winawer |
| 4. E Sosnowska vs J Harmsen |
| 1-0 | 36 | 1986 | Naleczow (Women) | C00 French Defense |
| 5. M Ionita vs J Harmsen |
| 1-0 | 35 | 1986 | Naleczow (Women) | A04 Reti Opening |
| 6. J Harmsen vs B Sikora-Gizynska |
| 0-1 | 35 | 1986 | Naleczow (Women) | A07 King's Indian Attack |
| 7. Z Ciechocinska-Miecko vs J Harmsen |
| 0-1 | 40 | 1986 | Naleczow (Women) | C16 French, Winawer |
| 8. J Harmsen vs I Mai |
| ½-½ | 42 | 1986 | Naleczow (Women) | A07 King's Indian Attack |
| 9. B Kaczorowska vs J Harmsen |
| 1-0 | 37 | 1986 | Naleczow (Women) | A80 Dutch |
| 10. J Harmsen vs B Majtyka |
| 0-1 | 45 | 1986 | Naleczow (Women) | A07 King's Indian Attack |
| 11. J Harmsen vs E Fatalibekova |
| 1-0 | 74 | 1986 | Naleczow (Women) | A07 King's Indian Attack |
| 12. U Jozwicka vs J Harmsen |
| 0-1 | 51 | 1986 | Naleczow (Women) | A80 Dutch |
| 13. J Harmsen vs V Ionescu |
| 0-1 | 29 | 1986 | Naleczow (Women) | A07 King's Indian Attack |
| 14. J Hankova vs J Harmsen |
| 0-1 | 41 | 1986 | Naleczow (Women) | A80 Dutch |
| 15. J Harmsen vs R Genova |
| ½-½ | 54 | 1986 | Naleczow (Women) | A07 King's Indian Attack |
| 16. J Harmsen vs M Voyska |
 | 1-0 | 34 | 1988 | Thessaloniki Olympiad (Women) | A07 King's Indian Attack |
| 17. P Cramling vs J Harmsen |
| 1-0 | 21 | 1988 | Thessaloniki Olympiad (Women) | A80 Dutch |
| 18. J Harmsen vs Chiburdanidze |
| ½-½ | 23 | 1988 | Thessaloniki Olympiad (Women) | A02 Bird's Opening |
| 19. J Harmsen vs E Belle |
| 0-1 | 64 | 1989 | NED-ch (Women) | B25 Sicilian, Closed |
| 20. P van Amerongen-Jansen vs J Harmsen |
| 0-1 | 31 | 1989 | NED-ch (Women) | A87 Dutch, Leningrad, Main Variation |
| 21. J Harmsen vs C Vreeken |
| 0-1 | 34 | 1989 | NED-ch (Women) | C29 Vienna Gambit |
| 22. H Abels vs J Harmsen |
| 1-0 | 49 | 1990 | NED-ch M corr | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 23. J Harmsen vs M Drewes |
| ½-½ | 61 | 1990 | Oisterwijk (Women) | B10 Caro-Kann |
| 24. A Serdijn vs J Harmsen |
| ½-½ | 46 | 1991 | Dutch Championship (Women) | C05 French, Tarrasch |
| 25. J Harmsen vs A Benschop |
| 0-1 | 43 | 1991 | Dutch Championship (Women) | A02 Bird's Opening |
Kibitzing
