| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. H I Oei vs Ashley |
| 0-1 | 40 |
1990 |
04, Groningen op 22 | E10 Queen's Pawn Game |
| 2. G Timoshchenko vs H I Oei |
| 1-0 | 59 |
1992 |
Avoine op | E39 Nimzo-Indian, Classical, Pirc Variation |
| 3. H I Oei vs G Kacheisvili |
| 0-1 | 30 |
1993 |
Groningen Chess Festival; GM open | D45 Queen's Gambit Declined Semi-Slav |
| 4. H I Oei vs N Davies |
| 0-1 | 52 |
1993 |
It (open) | E38 Nimzo-Indian, Classical, 4...c5 |
| 5. H I Oei vs Wojtkiewicz |
 | 0-1 | 24 |
1993 |
Antwerp open | A67 Benoni, Taimanov Variation |
| 6. H I Oei vs T Horvath |
| 0-1 | 45 |
1996 |
AKN | B33 Sicilian |
| 7. Wojtkiewicz vs H I Oei |
| 1-0 | 52 |
1996 |
It (open) | A15 English |
| 8. P Szekely vs H I Oei |
| ½-½ | 14 |
1996 |
AKN | A15 English |
| 9. D Dumitrache vs H I Oei |
| 1-0 | 40 |
2000 |
15th Open | D50 Queen's Gambit Declined |
| 10. O Gladyszev vs H I Oei |
| 1-0 | 40 |
2001 |
open | D35 Queen's Gambit Declined |
| 11. H I Oei vs A Bagheri |
| ½-½ | 53 |
2001 |
10th AKN Weekender | E11 Bogo-Indian Defense |
| 12. J Costa vs H I Oei |
| 0-1 | 19 |
2001 |
open | B12 Caro-Kann Defense |
| 13. H I Oei vs De Vreugt |
| 0-1 | 59 |
2001 |
open | A15 English |
| 14. H I Oei vs L Preeker |
| 1-0 | 16 |
2001 |
10th AKN Weekender | C42 Petrov Defense |
| 15. H I Oei vs De Leon Justo |
| 0-1 | 60 |
2001 |
open | A14 English |
| 16. R Feelders vs H I Oei |
| ½-½ | 14 |
2001 |
10th AKN Weekender | C81 Ruy Lopez, Open, Howell Attack |
| 17. H I Oei vs J B Campos-Moreno |
| 0-1 | 82 |
2001 |
open | A09 Reti Opening |
| 18. M Correia vs H I Oei |
| 0-1 | 37 |
2001 |
open | B95 Sicilian, Najdorf, 6...e6 |
| 19. H I Oei vs P Van den Berg |
| ½-½ | 53 |
2001 |
10th AKN Weekender | E68 King's Indian, Fianchetto, Classical Variation, 8.e4 |
| 20. J Santos vs H I Oei |
| 0-1 | 69 |
2001 |
open | B18 Caro-Kann, Classical |
| 21. H I Oei vs M Hemmings |
| 1-0 | 33 |
2001 |
open | A14 English |
| 22. J Horvath vs H I Oei |
| 1-0 | 25 |
2001 |
10th AKN Weekender | E17 Queen's Indian |
| 23. H I Oei vs D Leal |
| ½-½ | 34 |
2001 |
open | E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5 |
| 24. H I Oei vs M Gurevich |
| ½-½ | 94 |
2005 |
XXIII Open Andorra | D45 Queen's Gambit Declined Semi-Slav |