| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. Spassky vs J van Oosterom |
| 1-0 | 52 | 1955 | World Junior Championship qual-1 | C77 Ruy Lopez |
| 2. J van Oosterom vs M Farre |
| ½-½ | 27 | 1955 | Wch U20 final-A | B90 Sicilian, Najdorf |
| 3. Portisch vs J van Oosterom |
| 1-0 | 38 | 1955 | Wch U20 final-A | A44 Old Benoni Defense |
| 4. Spassky vs J van Oosterom |
 | 1-0 | 22 | 1955 | Wch U20 final-A | E85 King's Indian, Samisch, Orthodox Variation |
| 5. J van Oosterom vs G Tringov |
| ½-½ | 41 | 1955 | Wch U20 final-A | E59 Nimzo-Indian, 4.e3, Main line |
| 6. E Mednis vs J van Oosterom |
| 1-0 | 35 | 1955 | Wch U20 final-A | C59 Two Knights |
| 7. J van Oosterom vs R Martens |
| ½-½ | 62 | 1960 | WchT U26 07th | A21 English |
| 8. D Bertholdt vs J van Oosterom |
| 1-0 | 30 | 1960 | WchT U26 07th | A53 Old Indian |
| 9. J van Oosterom vs Y Nikolaevsky |
| 1-0 | 40 | 1960 | WchT U26 07th | A07 King's Indian Attack |
| 10. J van Oosterom vs A Hollis |
| 1-0 | 40 | 1960 | WchT U26 07th | A16 English |
| 11. W Van Humbeeck vs J van Oosterom |
| 0-1 | 25 | 1960 | WchT U26 07th | B41 Sicilian, Kan |
| 12. J van Oosterom vs Ivkov |
| 0-1 | 50 | 1967 | Imperia op | A10 English |
| 13. J van Oosterom vs M Romi |
| 1-0 | 35 | 1967 | Imperia op | A30 English, Symmetrical |
| 14. J Sinke vs J van Oosterom |
| 0-1 | 12 | 1980 | NED-ch10 corr | C33 King's Gambit Accepted |
| 15. P Seewald vs J van Oosterom |
| 0-1 | 36 | 1980 | NED-ch10 corr | E06 Catalan, Closed, 5.Nf3 |
| 16. J van Oosterom vs R E Booij |
| 1-0 | 27 | 1980 | NED-ch10 corr | C80 Ruy Lopez, Open |
| 17. G Timmerman vs J van Oosterom |
| ½-½ | 41 | 1980 | NED-ch10 corr | C84 Ruy Lopez, Closed |
| 18. J van Oosterom vs G Timmerman |
| 0-1 | 31 | 1982 | Volmac-A corr8286 | C47 Four Knights |
| 19. J J Carleton vs J van Oosterom |
 | 0-1 | 27 | 1987 | W-ch14 q02 corr8793 | C55 Two Knights Defense |
| 20. A Deuel vs J van Oosterom |
| ½-½ | 53 | 1987 | W-ch14 q02 corr8793 | E17 Queen's Indian |
| 21. J van Oosterom vs J Kolenbrander |
| 1-0 | 49 | 1991 | NED jub25 corr9193 | E84 King's Indian, Samisch, Panno Main line |
| 22. T Wibe vs J van Oosterom |
| ½-½ | 54 | 1991 | NED jub25 corr9193 | C27 Vienna Game |
| 23. G Timmerman vs J van Oosterom |
| ½-½ | 50 | 1991 | NED jub25 corr9193 | B93 Sicilian, Najdorf, 6.f4 |
| 24. H Rittner vs J van Oosterom |
| ½-½ | 68 | 1991 | NED jub25 corr9193 | B96 Sicilian, Najdorf |
| 25. E Bang vs J van Oosterom |
| ½-½ | 30 | 1994 | NOR jub50 corr | E15 Queen's Indian |
Kibitzing
