| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. C Orbaan vs J Barendregt |
| 1-0 | 45 | 1950 | Dutch Championship | C68 Ruy Lopez, Exchange |
| 2. C van den Berg vs C Orbaan |
| 1-0 | 32 | 1950 | Dutch Championship | C11 French |
| 3. C Orbaan vs H Kramer |
 | 0-1 | 25 | 1950 | Dutch Championship | A07 King's Indian Attack |
| 4. T van Scheltinga vs C Orbaan |
| 1-0 | 61 | 1950 | Dutch Championship | D65 Queen's Gambit Declined, Orthodox, Rubinstein Attack, Main line |
| 5. C Orbaan vs Euwe |
| 0-1 | 35 | 1950 | Dutch Championship | C65 Ruy Lopez, Berlin Defense |
| 6. C Orbaan vs E Spanjaard |
| 0-1 | 41 | 1950 | Dutch Championship | A07 King's Indian Attack |
| 7. F Henneberke vs C Orbaan |
| ½-½ | 52 | 1950 | Dutch Championship | D37 Queen's Gambit Declined |
| 8. C Orbaan vs J H Donner |
| 1-0 | 46 | 1950 | Dutch Championship | C68 Ruy Lopez, Exchange |
| 9. W J Muhring vs C Orbaan |
| 1-0 | 40 | 1950 | Dutch Championship | D61 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 10. C Orbaan vs L Stumpers |
| ½-½ | 16 | 1950 | Dutch Championship | C65 Ruy Lopez, Berlin Defense |
| 11. N Cortlever vs C Orbaan |
| 1-0 | 46 | 1950 | Dutch Championship | A04 Reti Opening |
| 12. J H Donner vs C Orbaan |
| 1-0 | 44 | 1954 | Dutch Championship | D40 Queen's Gambit Declined, Semi-Tarrasch |
| 13. C Orbaan vs J van den Bosch |
| 1-0 | 45 | 1954 | Dutch Championship | B50 Sicilian |
| 14. Euwe vs C Orbaan |
| 1-0 | 27 | 1954 | Dutch Championship | E00 Queen's Pawn Game |
| 15. G Willners vs C Orbaan |
| 0-1 | 51 | 1954 | Burmania Cup | B45 Sicilian, Taimanov |
| 16. C Orbaan vs L Klaeger |
| 0-1 | 28 | 1954 | GSC Tournament | C75 Ruy Lopez, Modern Steinitz Defense |
| 17. C Orbaan vs J C Scheffer |
| 1-0 | 24 | 1955 | NED-ch18 sf | A04 Reti Opening |
| 18. C Orbaan vs H Bouwmeester |
| 0-1 | 40 | 1956 | Hoogovens | B13 Caro-Kann, Exchange |
| 19. F Roessel vs C Orbaan |
| 0-1 | 30 | 1956 | Hoogovens | B45 Sicilian, Taimanov |
| 20. C Orbaan vs Pilnik |
| 0-1 | 32 | 1956 | Hoogovens | D78 Neo-Grunfeld, 6.O-O c6 |
| 21. T van Scheltinga vs C Orbaan |
| 1-0 | 25 | 1956 | Hoogovens | E62 King's Indian, Fianchetto |
| 22. C Orbaan vs R Toran |
| 0-1 | 58 | 1956 | Hoogovens | A07 King's Indian Attack |
| 23. C Orbaan vs F Scafarelli |
| 0-1 | 58 | 1956 | Hoogovens | A07 King's Indian Attack |
| 24. Stahlberg vs C Orbaan |
| 1-0 | 42 | 1956 | Hoogovens | E74 King's Indian, Averbakh, 6...c5 |
| 25. C Orbaan vs A Matanovic |
| 0-1 | 28 | 1956 | Hoogovens | C68 Ruy Lopez, Exchange |
Kibitzing
