| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 51. M Umansky vs J Van Oosterom |
| ½-½ | 29 |
2003 |
ICCF - corr | E01 Catalan, Closed |
| 52. J Van Oosterom vs Vittorio Piccardo |
| 1-0 | 38 |
2003 |
ICCF - corr | E90 King's Indian |
| 53. H Tiemann vs J Van Oosterom |
| 0-1 | 54 |
2003 |
ICCF - corr | B90 Sicilian, Najdorf |
| 54. H M Elwert vs J Van Oosterom |
| ½-½ | 65 |
2003 |
ICCF - corr | B30 Sicilian |
| 55. J Van Oosterom vs V Hefka |
| 1-0 | 45 |
2003 |
WC18F | B90 Sicilian, Najdorf |
| 56. J Van Oosterom vs M Nimtz |
| 1-0 | 49 |
2003 |
ICCF - corr | B80 Sicilian, Scheveningen |
| 57. A Soltau vs J Van Oosterom |
| ½-½ | 54 |
2003 |
ICCF - corr | B22 Sicilian, Alapin |
| 58. J Van Oosterom vs G Solis de Ovando |
| ½-½ | 45 |
2003 |
ICCF - corr | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 59. J Van Oosterom vs D Fleetwood |
| ½-½ | 58 |
2003 |
ICCF - corr | E12 Queen's Indian |
| 60. W Schoen vs J Van Oosterom |
| ½-½ | 49 |
2003 |
ICCF - corr | B90 Sicilian, Najdorf |
| 61. J Van Oosterom vs Patrick Spitz |
| 1-0 | 44 |
2003 |
ICCF - corr | E69 King's Indian, Fianchetto, Classical Main line |
| 62. H E van Kempen vs J Van Oosterom |
| 0-1 | 42 |
2003 |
ICCF - corr | B90 Sicilian, Najdorf |
| 63. A Nickel vs J Van Oosterom |
 | 1-0 | 45 |
2005 |
WCCC 21th Final | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 64. I Bern vs J Van Oosterom |
| 1-0 | 54 |
2006 |
ICCF Olympiad 15 Final | E94 King's Indian, Orthodox |
| 65. J Van Oosterom vs M Umansky |
| ½-½ | 67 |
2006 |
H J Mostert Memorial Team Match | A42 Modern Defense, Averbakh System |