| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. J Van Oosterom vs R J Maliangkay |
| 1-0 | 42 |
1998 |
Korning Memorial | E97 King's Indian |
| 27. Hector vs J Van Oosterom |
| ½-½ | 22 |
1998 |
Korning Memorial | C78 Ruy Lopez |
| 28. J Van Oosterom vs Nielsen Jens |
| 1-0 | 36 |
1998 |
corr Korning Memorial -2001 | D45 Queen's Gambit Declined Semi-Slav |
| 29. J Van Oosterom vs R Knobel |
| ½-½ | 31 |
1998 |
Korning Memorial | B66 Sicilian, Richter-Rauzer Attack, 7...a6 |
| 30. C Hansen vs J Van Oosterom |
| ½-½ | 32 |
1998 |
Korning Memorial | C78 Ruy Lopez |
| 31. J Trapl vs J Van Oosterom |
| 0-1 | 31 |
1998 |
corr Korning Memorial -2001 | E60 King's Indian Defense |
| 32. J Van Oosterom vs L Hyldkrog |
| 1-0 | 49 |
1998 |
Korning Memorial | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 33. H M Elwert vs J Van Oosterom |
| 0-1 | 32 |
1998 |
Korning Memorial | E97 King's Indian |
| 34. J Van Oosterom vs H Tanggaard |
| 1-0 | 56 |
1998 |
Korning Memorial | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 35. M Read vs J Van Oosterom |
| ½-½ | 33 |
1998 |
Korning Memorial | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 36. J Van Oosterom vs N Borge |
| 1-0 | 24 |
1998 |
corr Korning Memorial -2001 | D97 Grunfeld, Russian |
| 37. J Van Oosterom vs M Plomp |
| 1-0 | 22 |
1998 |
Korning Memorial | D37 Queen's Gambit Declined |
| 38. S Jardorf vs J Van Oosterom |
| 0-1 | 53 |
1998 |
Korning Memorial | B22 Sicilian, Alapin |
| 39. M Rufenacht vs J Van Oosterom |
| ½-½ | 51 |
1998 |
corr Korning Memorial -2001 | C47 Four Knights |
| 40. J Van Oosterom vs H M Elwert |
| ½-½ | 46 |
1999 |
NBC Millennium Email | B92 Sicilian, Najdorf, Opocensky Variation |
| 41. E Bang vs J Van Oosterom |
| ½-½ | 35 |
1999 |
NBC Millennium Email | D76 Neo-Grunfeld, 6.cd Nxd5, 7.O-O Nb6 |
| 42. J Van Oosterom vs E Bang |
| 1-0 | 29 |
1999 |
NBC Millennium Email | C84 Ruy Lopez, Closed |
| 43. Ulf Andersson vs J Van Oosterom |
| ½-½ | 47 |
1999 |
NBC Millennium Email | E61 King's Indian |
| 44. J Van Oosterom vs Ulf Andersson |
| ½-½ | 30 |
1999 |
NBC Millennium Email | B42 Sicilian, Kan |
| 45. J Van Oosterom vs G Timmerman |
 | 1-0 | 62 |
1999 |
NBC Millennium Email | E97 King's Indian |
| 46. G Timmerman vs J Van Oosterom |
| 0-1 | 70 |
1999 |
NBC Millennium Email | B90 Sicilian, Najdorf |
| 47. J Van Oosterom vs H Tarnowiecki |
| ½-½ | 43 |
1999 |
NBC Millennium Email | C18 French, Winawer |
| 48. H Tarnowiecki vs J Van Oosterom |
| 1-0 | 60 |
1999 |
NBC Millennium Email | E90 King's Indian |
| 49. M Mraz vs J Van Oosterom |
| 0-1 | 45 |
2003 |
ICCF - corr | E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3 |
| 50. J Van Oosterom vs Olita V Rause |
| 1-0 | 36 |
2003 |
ICCF - corr | C42 Petrov Defense |