| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Jonkman vs Garcia |
| 0-1 | 48 |
1990 |
Haarlem Noord-Hol.Ch | B22 Sicilian, Alapin |
| 2. Jonkman vs H Vedder |
| 0-1 | 53 |
1990 |
NED-ch op U20 | C02 French, Advance |
| 3. Garcia vs Jonkman |
| 1-0 | 41 |
1992 |
Den Haag | C25 Vienna |
| 4. Jonkman vs E Denayer |
 | 0-1 | 27 |
1993 |
It open | C32 King's Gambit Declined, Falkbeer Counter Gambit |
| 5. W Schmidt vs Jonkman |
| ½-½ | 76 |
1993 |
Dresden op | D24 Queen's Gambit Accepted |
| 6. Jonkman vs B Finegold |
| 0-1 | 61 |
1993 |
Groningen Chess Festival; GM open | B22 Sicilian, Alapin |
| 7. Jonkman vs F Kroeze |
| ½-½ | 49 |
1993 |
Leeuwarden op | C36 King's Gambit Accepted, Abbazia Defense |
| 8. D Postma vs Jonkman |
| 0-1 | 42 |
1993 |
NED-ch U20 | C53 Giuoco Piano |
| 9. J Hania vs Jonkman |
 | 0-1 | 40 |
1993 |
It (open) | C25 Vienna |
| 10. Jonkman vs Plachetka |
| 0-1 | 31 |
1993 |
Cannes op2 | B22 Sicilian, Alapin |
| 11. Jonkman vs W Zagema |
| ½-½ | 77 |
1994 |
It open | C37 King's Gambit Accepted |
| 12. Jonkman vs Wojtkiewicz |
| ½-½ | 73 |
1994 |
It Wijk aan Zee (NED) (03) | B22 Sicilian, Alapin |
| 13. Jonkman vs R Ziatdinov |
 | 0-1 | 22 |
1994 |
Ch Netherlands (open), VIII, A | C34 King's Gambit Accepted |
| 14. C Marcelin vs Jonkman |
| 0-1 | 72 |
1994 |
It (open) | C50 Giuoco Piano |
| 15. Jonkman vs F Kroeze |
| 0-1 | 66 |
1994 |
It open | C37 King's Gambit Accepted |
| 16. Sutovsky vs Jonkman |
 | 1-0 | 60 |
1994 |
Groningen | C47 Four Knights |
| 17. Jonkman vs F Kroeze |
| 0-1 | 69 |
1994 |
Semi-finals Dutch championship | C30 King's Gambit Declined |
| 18. Jonkman vs Pavasovic |
| 1-0 | 33 |
1994 |
It c | C31 King's Gambit Declined, Falkbeer Counter Gambit |
| 19. Jonkman vs B Trabert |
| 0-1 | 40 |
1994 |
It c | C34 King's Gambit Accepted |
| 20. Jonkman vs L B Hansen |
| 0-1 | 36 |
1994 |
Wijk aan Zee B | C38 King's Gambit Accepted |
| 21. Kupreichik vs Jonkman |
| 1-0 | 45 |
1995 |
Groningen op | C63 Ruy Lopez, Schliemann Defense |
| 22. Jonkman vs T Ellenbroek |
| 1-0 | 34 |
1995 |
It (open), VIII, Leeuwarden (N | C30 King's Gambit Declined |
| 23. Jonkman vs Barsov |
| 0-1 | 49 |
1995 |
Soest op | C02 French, Advance |
| 24. R Janssen vs Jonkman |
| 0-1 | 23 |
1995 |
It open | C31 King's Gambit Declined, Falkbeer Counter Gambit |
| 25. M Kamenik vs Jonkman |
| 1-0 | 34 |
1996 |
Decin (Czech Republic) | C50 Giuoco Piano |