| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. N Cortlever vs S Landau |
| 0-1 | 28 | 1936 | NED-ch | C01 French, Exchange |
| 2. T van Scheltinga vs N Cortlever |
| 1-0 | 23 | 1936 | NED-ch | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 3. O Krassnig vs N Cortlever |
 | 1-0 | 20 | 1936 | non-FIDE Munich Olympiad | C41 Philidor Defense |
| 4. J Francez vs N Cortlever |
| 0-1 | 26 | 1936 | non-FIDE Munich Olympiad | A83 Dutch, Staunton Gambit |
| 5. N Cortlever vs K Salbu |
| 0-1 | 40 | 1936 | non-FIDE Munich Olympiad | D52 Queen's Gambit Declined |
| 6. B Breider vs N Cortlever |
| 1-0 | 31 | 1936 | non-FIDE Munich Olympiad | C41 Philidor Defense |
| 7. N Cortlever vs F W Kokje |
| 1-0 | 15 | 1936 | NED Team-ch /37 | C31 King's Gambit Declined, Falkbeer Counter Gambit |
| 8. N Cortlever vs G Goethart |
| ½-½ | 59 | 1937 | NED Team-ch 1936/37 | C30 King's Gambit Declined |
| 9. N Cortlever vs C Struylaart |
| 0-1 | 26 | 1938 | VVGA Amsterdam | C02 French, Advance |
| 10. G van Doesburgh vs N Cortlever |
| 0-1 | 57 | 1938 | Dutch Championship | D81 Grunfeld, Russian Variation |
| 11. E Mulder vs N Cortlever |
| 1-0 | 46 | 1938 | Dutch Championship | E60 King's Indian Defense |
| 12. N Cortlever vs Euwe |
| 0-1 | 33 | 1938 | Dutch Championship | C56 Two Knights |
| 13. N Cortlever vs J van den Bosch |
| ½-½ | 20 | 1938 | Dutch Championship | B15 Caro-Kann |
| 14. N Cortlever vs S Landau |
| ½-½ | 26 | 1939 | Amsterdam VARA | B74 Sicilian, Dragon, Classical |
| 15. N Cortlever vs A de Groot |
| 1-0 | 37 | 1939 | Amsterdam-ch | B03 Alekhine's Defense |
| 16. N Cortlever vs G Fontein |
| 0-1 | 34 | 1939 | Amsterdam/Hilversum | B74 Sicilian, Dragon, Classical |
| 17. N Cortlever vs Flohr |
| 0-1 | 69 | 1939 | Amsterdam/Hilversum | C46 Three Knights |
| 18. Szabo vs N Cortlever |
 | 1-0 | 44 | 1939 | Amsterdam/Hilversum | C83 Ruy Lopez, Open |
| 19. N Cortlever vs Euwe |
| ½-½ | 35 | 1939 | Amsterdam/Hilversum | C38 King's Gambit Accepted |
| 20. S Landau vs N Cortlever |
| 0-1 | 32 | 1939 | Amsterdam/Hilversum | A95 Dutch, Stonewall |
| 21. G Fontein vs N Cortlever |
| 0-1 | 40 | 1939 | Amsterdam VARA | D85 Grunfeld |
| 22. Flohr vs N Cortlever |
| 1-0 | 34 | 1939 | Amsterdam VARA | D96 Grunfeld, Russian Variation |
| 23. N Cortlever vs Szabo |
| 1-0 | 40 | 1939 | Amsterdam VARA | B83 Sicilian |
| 24. Euwe vs N Cortlever |
| ½-½ | 47 | 1939 | The Hague VARA | D96 Grunfeld, Russian Variation |
| 25. R Broadbent vs N Cortlever |
| 1-0 | 39 | 1939 | Netherlands - England | B72 Sicilian, Dragon |
Kibitzing
