| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Van Oosterom vs A Hollis |
| 1-0 | 40 |
1960 |
WchT U26 07th | A16 English |
| 2. J Van Oosterom vs M Romi |
| 1-0 | 35 |
1967 |
Imperia | A30 English, Symmetrical |
| 3. J Sinke vs J Van Oosterom |
 | 0-1 | 12 |
1981 |
corres NLD | C33 King's Gambit Accepted |
| 4. J Van Oosterom vs R E Booij |
| 1-0 | 27 |
1982 |
corr Holland ch 10 | C80 Ruy Lopez, Open |
| 5. J J Carleton vs J Van Oosterom |
| 0-1 | 27 |
1989 |
Corr. World Ch. 1987/89 | C55 Two Knights Defense |
| 6. D Kilgour vs J Van Oosterom |
| 0-1 | 63 |
1996 |
WC15 Final | C92 Ruy Lopez, Closed |
| 7. J Vitomskis vs J Van Oosterom |
| 0-1 | 50 |
1996 |
WC15 Final | C92 Ruy Lopez, Closed |
| 8. V Gefenas vs J Van Oosterom |
| 0-1 | 37 |
1996 |
WC15 Final | E92 King's Indian |
| 9. J Van Oosterom vs R Reynolds |
 | 1-0 | 38 |
1996 |
WC15 Final | A52 Budapest Gambit |
| 10. J A Barlow vs J Van Oosterom |
 | 0-1 | 17 |
1996 |
WC15 Final | B92 Sicilian, Najdorf, Opocensky Variation |
| 11. J Van Oosterom vs M Prizant |
| 1-0 | 60 |
1996 |
WC15 Final | E32 Nimzo-Indian, Classical |
| 12. J Van Oosterom vs J J Carleton |
| 1-0 | 26 |
1996 |
WC15 Final | D31 Queen's Gambit Declined |
| 13. J Van Oosterom vs M Plomp |
| 1-0 | 22 |
1998 |
Korning Memorial | D37 Queen's Gambit Declined |
| 14. J Van Oosterom vs N Borge |
| 1-0 | 24 |
1998 |
corr Korning Memorial -2001 | D97 Grunfeld, Russian |
| 15. J Van Oosterom vs R J Maliangkay |
| 1-0 | 42 |
1998 |
Korning Memorial | E97 King's Indian |
| 16. J Van Oosterom vs Nielsen Jens |
| 1-0 | 36 |
1998 |
corr Korning Memorial -2001 | D45 Queen's Gambit Declined Semi-Slav |
| 17. J Van Oosterom vs L Hyldkrog |
| 1-0 | 49 |
1998 |
Korning Memorial | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 18. J Trapl vs J Van Oosterom |
| 0-1 | 31 |
1998 |
corr Korning Memorial -2001 | E60 King's Indian Defense |
| 19. S Jardorf vs J Van Oosterom |
| 0-1 | 53 |
1998 |
Korning Memorial | B22 Sicilian, Alapin |
| 20. J Van Oosterom vs H Tanggaard |
| 1-0 | 56 |
1998 |
Korning Memorial | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 21. H M Elwert vs J Van Oosterom |
| 0-1 | 32 |
1998 |
Korning Memorial | E97 King's Indian |
| 22. J Van Oosterom vs G Timmerman |
 | 1-0 | 62 |
1999 |
NBC Millennium Email | E97 King's Indian |
| 23. J Van Oosterom vs E Bang |
| 1-0 | 29 |
1999 |
NBC Millennium Email | C84 Ruy Lopez, Closed |
| 24. G Timmerman vs J Van Oosterom |
| 0-1 | 70 |
1999 |
NBC Millennium Email | B90 Sicilian, Najdorf |
| 25. H E van Kempen vs J Van Oosterom |
| 0-1 | 42 |
2003 |
ICCF - corr | B90 Sicilian, Najdorf |