| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. E Oosterom vs I Rogers |
| 0-1 | 50 | 1989 | Noteboom Open | C07 French, Tarrasch |
| 2. G Welling vs E Oosterom |
| 1-0 | 36 | 1993 | KNSB league | A46 Queen's Pawn Game |
| 3. A Reedijk vs E Oosterom |
| ½-½ | 32 | 1994 | Dutch Tch | B65 Sicilian, Richter-Rauzer Attack, 7...Be7 Defense, 9...Nxd4 |
| 4. I Kadimova vs E Oosterom |
| 1-0 | 17 | 1995 | Groningen Open | E92 King's Indian |
| 5. N Ristic vs E Oosterom |
| 0-1 | 37 | 1995 | Groningen Open | B31 Sicilian, Rossolimo Variation |
| 6. S Atalik vs E Oosterom |
| 1-0 | 37 | 1997 | Groningen Open | E37 Nimzo-Indian, Classical |
| 7. E Oosterom vs P Theulings |
| 1-0 | 16 | 1997 | Groningen Open | E15 Queen's Indian |
| 8. D Reinderman vs E Oosterom |
| 1-0 | 36 | 1998 | Groningen Open | B08 Pirc, Classical |
| 9. Barsov vs E Oosterom |
| 1-0 | 53 | 1999 | Keres mem op | E12 Queen's Indian |
| 10. E Oosterom vs P Schuurman |
| ½-½ | 60 | 1999 | Haarlem AKN op 8th | A04 Reti Opening |
| 11. J Kalma vs E Oosterom |
| 0-1 | 29 | 2000 | Haarlem AKN Open | A46 Queen's Pawn Game |
| 12. E Oosterom vs F Beverdam |
| 1-0 | 29 | 2000 | Haarlem AKN Open | E92 King's Indian |
| 13. A Blees vs E Oosterom |
| ½-½ | 59 | 2000 | Haarlem AKN Open | D11 Queen's Gambit Declined Slav |
| 14. E Oosterom vs A Dgebuadze |
| 0-1 | 33 | 2000 | Haarlem AKN Open | D45 Queen's Gambit Declined Semi-Slav |
| 15. E Oosterom vs H Mawira |
| 1-0 | 53 | 2000 | Haarlem AKN Open | E92 King's Indian |
| 16. E Ragozin vs E Oosterom |
| 1-0 | 39 | 2000 | Haarlem AKN Open | D19 Queen's Gambit Declined Slav, Dutch |
| 17. E Oosterom vs A Blees |
| 1-0 | 32 | 2000 | Amsterdam Lost Boys Open | D02 Queen's Pawn Game |
| 18. A Shchekachev vs E Oosterom |
| 1-0 | 46 | 2000 | Amsterdam Lost Boys Open | D15 Queen's Gambit Declined Slav |
| 19. E Oosterom vs R Bertholee |
| ½-½ | 80 | 2000 | Amsterdam Lost Boys Open | A35 English, Symmetrical |
| 20. R Wendt vs E Oosterom |
| 1-0 | 56 | 2000 | Amsterdam Lost Boys Open | D17 Queen's Gambit Declined Slav |
| 21. E Oosterom vs J Jens |
| 0-1 | 27 | 2000 | Amsterdam Lost Boys Open | E60 King's Indian Defense |
| 22. B Byklum vs E Oosterom |
| 1-0 | 46 | 2000 | Amsterdam Lost Boys Open | A07 King's Indian Attack |
| 23. E Oosterom vs B Pel |
| 0-1 | 59 | 2000 | Amsterdam Lost Boys Open | B08 Pirc, Classical |
| 24. R Lahaye vs E Oosterom |
| ½-½ | 33 | 2000 | Amsterdam Lost Boys Open | C42 Petrov Defense |
| 25. E Oosterom vs C van Dongen |
| 1-0 | 44 | 2000 | Amsterdam Lost Boys Open | A48 King's Indian |
Kibitzing
