| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. G de Boer vs J van Mil |
| ½-½ | 28 | 1977 | Dutch Junior Championship | B01 Scandinavian |
| 2. S Douma vs G de Boer |
| 0-1 | 22 | 1977 | Dutch Junior Championship | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 3. G de Boer vs O ter Haar |
| 0-1 | 26 | 1977 | Dutch Junior Championship | C05 French, Tarrasch |
| 4. R Douven vs G de Boer |
| 0-1 | 55 | 1977 | Dutch Junior Championship | E91 King's Indian |
| 5. G de Boer vs C Stehouwer |
| 1-0 | 20 | 1977 | Dutch Junior Championship | B40 Sicilian |
| 6. G de Boer vs Van der Wiel |
| 0-1 | 51 | 1977 | Dutch Junior Championship | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 7. B P Mulder vs G de Boer |
| 0-1 | 44 | 1977 | Dutch Junior Championship | A04 Reti Opening |
| 8. H Janssen vs G de Boer |
| 1-0 | 34 | 1977 | Dutch Junior Championship | B72 Sicilian, Dragon |
| 9. G de Boer vs J Baart |
| 0-1 | 68 | 1977 | Dutch Junior Championship | B70 Sicilian, Dragon Variation |
| 10. G de Boer vs K Kwak |
| ½-½ | 37 | 1978 | Castricum | A55 Old Indian, Main line |
| 11. L Arnold vs G de Boer |
| ½-½ | 40 | 1978 | European Junior Championship 1978/79 | C19 French, Winawer, Advance |
| 12. G de Boer vs D Cramling |
| 1-0 | 61 | 1978 | European Junior Championship 1978/79 | B45 Sicilian, Taimanov |
| 13. J Pereira Santos vs G de Boer |
 | 0-1 | 41 | 1978 | European Junior Championship 1978/79 | E81 King's Indian, Samisch |
| 14. G de Boer vs B Tiller |
| ½-½ | 31 | 1978 | European Junior Championship 1978/79 | C07 French, Tarrasch |
| 15. F X Mateu vs G de Boer |
| 1-0 | 79 | 1978 | European Junior Championship 1978/79 | A15 English |
| 16. G de Boer vs E Pedersen |
| 0-1 | 45 | 1978 | European Junior Championship 1978/79 | B16 Caro-Kann, Bronstein-Larsen Variation |
| 17. T Karolyi vs G de Boer |
| 1-0 | 61 | 1978 | European Junior Championship 1978/79 | B22 Sicilian, Alapin |
| 18. G de Boer vs L Zimmermann |
| ½-½ | 29 | 1978 | European Junior Championship 1978/79 | C77 Ruy Lopez |
| 19. A Hessenbruch vs G de Boer |
| ½-½ | 11 | 1978 | European Junior Championship 1978/79 | E12 Queen's Indian |
| 20. G de Boer vs E Hoeksema |
| 1-0 | 44 | 1979 | NED-ch U20 | B45 Sicilian, Taimanov |
| 21. N Grinberg vs G de Boer |
| ½-½ | 14 | 1979 | European Junior Championship 1978/79 | C15 French, Winawer |
| 22. G de Boer vs B Neuenschwander |
| ½-½ | 21 | 1979 | European Junior Championship 1978/79 | B29 Sicilian, Nimzovich-Rubinstein |
| 23. G de Boer vs R Ratti |
| ½-½ | 28 | 1979 | European Junior Championship 1978/79 | B31 Sicilian, Rossolimo Variation |
| 24. P Heaven vs G de Boer |
| 1-0 | 36 | 1979 | European Junior Championship 1978/79 | C18 French, Winawer |
| 25. M Vujovic vs G de Boer |
| 1-0 | 32 | 1979 | Biel Open | B81 Sicilian, Scheveningen, Keres Attack |
Kibitzing
