| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. F Henneberke vs G Kool |
| ½-½ | 24 | 1962 | Amsterdam IBM | A46 Queen's Pawn Game |
| 2. J H Donner vs G Kool |
| 1-0 | 26 | 1962 | Amsterdam IBM | E30 Nimzo-Indian, Leningrad |
| 3. G Kool vs W Heidenfeld |
| 1-0 | 50 | 1962 | Amsterdam IBM | C02 French, Advance |
| 4. M Czerniak vs G Kool |
| 1-0 | 21 | 1962 | Amsterdam IBM | B13 Caro-Kann, Exchange |
| 5. G Kool vs R Hartoch |
| ½-½ | 17 | 1962 | Amsterdam IBM | A53 Old Indian |
| 6. H L Tan vs G Kool |
| 1-0 | 67 | 1962 | Amsterdam IBM | E15 Queen's Indian |
| 7. G Kool vs C van den Berg |
| ½-½ | 13 | 1962 | Amsterdam IBM | E19 Queen's Indian, Old Main line, 9.Qxc3 |
| 8. A Dunkelblum vs G Kool |
| 1-0 | 45 | 1962 | Amsterdam IBM | E18 Queen's Indian, Old Main line, 7.Nc3 |
| 9. G Kool vs L Rellstab |
| 0-1 | 47 | 1962 | Amsterdam IBM | E11 Bogo-Indian Defense |
| 10. G Kieninger vs G Kool |
| 1-0 | 69 | 1962 | Amsterdam IBM | C41 Philidor Defense |
| 11. G Kool vs K Langeweg |
| 0-1 | 33 | 1962 | Amsterdam IBM | A53 Old Indian |
| 12. H Crabbendam vs G Kool |
| 1-0 | 26 | 1963 | Amsterdam IBM-B | C47 Four Knights |
| 13. L Rellstab vs G Kool |
| 1-0 | 24 | 1963 | Amsterdam IBM-B | E38 Nimzo-Indian, Classical, 4...c5 |
| 14. G Kool vs H Lehmann |
| 0-1 | 47 | 1963 | Amsterdam IBM-B | D86 Grunfeld, Exchange |
| 15. R Hartoch vs G Kool |
| 1-0 | 63 | 1963 | Amsterdam IBM-B | C67 Ruy Lopez |
| 16. G Kool vs G Kieninger |
| 1-0 | 40 | 1963 | Amsterdam IBM-B | A44 Old Benoni Defense |
| 17. C Zuidema vs G Kool |
| ½-½ | 56 | 1963 | Amsterdam IBM-B | C67 Ruy Lopez |
| 18. G Kool vs M Bertok |
| 1-0 | 38 | 1963 | Amsterdam IBM-B | E85 King's Indian, Samisch, Orthodox Variation |
| 19. H Ree vs G Kool |
 | 1-0 | 39 | 1963 | Amsterdam IBM-B | C65 Ruy Lopez, Berlin Defense |
| 20. G Kool vs A Dunkelblum |
| ½-½ | 25 | 1963 | Amsterdam IBM-B | A34 English, Symmetrical |
| 21. G Kool vs T Karolyi |
| 0-1 | 35 | 1987 | Ohra Masters' Trophy | A13 English |
| 22. G Kool vs J Polgar |
| 0-1 | 37 | 1987 | Ohra Masters' Trophy | A37 English, Symmetrical |
| 23. T Van Houtte vs G Kool |
| ½-½ | 48 | 1987 | Ohra Masters' Trophy | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 24. G Kool vs P Kerkhof |
| ½-½ | 38 | 1987 | Ohra Masters' Trophy | A10 English |
| 25. G Kool vs R Polaczek |
| 0-1 | 31 | 1987 | Ohra Masters' Trophy | A17 English |
Kibitzing
