| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. L Rellstab vs R Hartoch |
| 1-0 | 41 | 1962 | Amsterdam IBM | E64 King's Indian, Fianchetto, Yugoslav System |
| 2. R Hartoch vs G Kieninger |
| 0-1 | 42 | 1962 | Amsterdam IBM | B80 Sicilian, Scheveningen |
| 3. K Langeweg vs R Hartoch |
| 1-0 | 27 | 1962 | Amsterdam IBM | E61 King's Indian |
| 4. R Hartoch vs F Henneberke |
| 1-0 | 56 | 1962 | Amsterdam IBM | C87 Ruy Lopez |
| 5. G Kool vs R Hartoch |
| ½-½ | 17 | 1962 | Amsterdam IBM | A53 Old Indian |
| 6. R Hartoch vs W Heidenfeld |
| 0-1 | 40 | 1962 | Amsterdam IBM | C05 French, Tarrasch |
| 7. M Czerniak vs R Hartoch |
| ½-½ | 80 | 1962 | Amsterdam IBM | B13 Caro-Kann, Exchange |
| 8. J H Donner vs R Hartoch |
| ½-½ | 40 | 1962 | Amsterdam IBM | E69 King's Indian, Fianchetto, Classical Main line |
| 9. R Hartoch vs H L Tan |
| ½-½ | 17 | 1962 | Amsterdam IBM | A00 Uncommon Opening |
| 10. C van den Berg vs R Hartoch |
 | ½-½ | 37 | 1962 | Amsterdam IBM | C96 Ruy Lopez, Closed |
| 11. R Hartoch vs A Dunkelblum |
| ½-½ | 26 | 1962 | Amsterdam IBM | B18 Caro-Kann, Classical |
| 12. H Ree vs R Hartoch |
| 1-0 | 62 | 1963 | Amsterdam IBM-B | A44 Old Benoni Defense |
| 13. R Hartoch vs A Dunkelblum |
| 1-0 | 44 | 1963 | Amsterdam IBM-B | C41 Philidor Defense |
| 14. H Crabbendam vs R Hartoch |
| 0-1 | 61 | 1963 | Amsterdam IBM-B | C53 Giuoco Piano |
| 15. R Hartoch vs G Kool |
| 1-0 | 63 | 1963 | Amsterdam IBM-B | C67 Ruy Lopez |
| 16. H Lehmann vs R Hartoch |
| 1-0 | 61 | 1963 | Amsterdam IBM-B | C95 Ruy Lopez, Closed, Breyer |
| 17. L Rellstab vs R Hartoch |
| ½-½ | 63 | 1963 | Amsterdam IBM-B | C78 Ruy Lopez |
| 18. R Hartoch vs G Kieninger |
| ½-½ | 19 | 1963 | Amsterdam IBM-B | C02 French, Advance |
| 19. C Zuidema vs R Hartoch |
| ½-½ | 48 | 1963 | Amsterdam IBM-B | C78 Ruy Lopez |
| 20. R Hartoch vs M Bertok |
| ½-½ | 56 | 1963 | Amsterdam IBM-B | B77 Sicilian, Dragon, Yugoslav Attack |
| 21. O M Hindle vs R Hartoch |
| 0-1 | 33 | 1963 | Anglo-Dutch Match | C95 Ruy Lopez, Closed, Breyer |
| 22. R Hartoch vs O M Hindle |
| ½-½ | 63 | 1963 | Anglo-Dutch Match | B48 Sicilian, Taimanov Variation |
| 23. R Hartoch vs Huebner |
| ½-½ | 41 | 1964 | Niemeyer Juniors | C10 French |
| 24. R Hartoch vs P Van Herck |
| 1-0 | 47 | 1964 | Niemeyer Juniors | C89 Ruy Lopez, Marshall |
| 25. R Hartoch vs G Antunac |
| 1-0 | 33 | 1964 | Niemeyer Juniors | C64 Ruy Lopez, Classical |
Kibitzing
