| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Vogel vs G de Boer |
| ½-½ | 24 | 1980 | Amsterdam IBM-C | A04 Reti Opening |
| 27. B Enklaar vs G de Boer |
| 1-0 | 31 | 1980 | Amsterdam IBM-C | A56 Benoni Defense |
| 28. G de Boer vs Chernin |
| ½-½ | 36 | 1980 | Amsterdam IBM-C | B08 Pirc, Classical |
| 29. Van der Sterren vs G de Boer |
| 1-0 | 41 | 1980 | Amsterdam IBM-C | A63 Benoni, Fianchetto, 9...Nbd7 |
| 30. G de Boer vs K Schiffer |
| 0-1 | 21 | 1980 | Amsterdam IBM-C | B45 Sicilian, Taimanov |
| 31. A Haik vs G de Boer |
| ½-½ | 57 | 1980 | Amsterdam IBM-C | E61 King's Indian |
| 32. G de Boer vs A de Savornin Lohman |
| 1-0 | 44 | 1980 | Amsterdam IBM-C | C05 French, Tarrasch |
| 33. A Duer vs G de Boer |
| 1-0 | 13 | 1980 | Amsterdam IBM-C | B07 Pirc |
| 34. G de Boer vs P Scheeren |
| ½-½ | 31 | 1980 | Amsterdam IBM-C | C78 Ruy Lopez |
| 35. C Baljon vs G de Boer |
| 1-0 | 56 | 1980 | Amsterdam IBM-C | B46 Sicilian, Taimanov Variation |
| 36. G de Boer vs E Formanek |
| ½-½ | 52 | 1980 | Amsterdam IBM-C | B83 Sicilian |
| 37. G de Boer vs I Wells |
| ½-½ | 47 | 1981 | Hastings Challengers 1980/81 | A30 English, Symmetrical |
| 38. M Hebden vs G de Boer |
| 1-0 | 39 | 1981 | 5th Lloyds Bank Masters Open | B21 Sicilian, 2.f4 and 2.d4 |
| 39. G de Boer vs S Conquest |
| 0-1 | 34 | 1981 | Regency Masters | B43 Sicilian, Kan, 5.Nc3 |
| 40. E Formanek vs G de Boer |
| 1-0 | 52 | 1981 | Regency Masters | B81 Sicilian, Scheveningen, Keres Attack |
| 41. G de Boer vs R W O'Brien |
| 1-0 | 44 | 1981 | Regency Masters | A16 English |
| 42. N Tagnon vs G de Boer |
| 0-1 | 25 | 1981 | Regency Masters | B21 Sicilian, 2.f4 and 2.d4 |
| 43. G de Boer vs Nunn |
| 0-1 | 21 | 1981 | Regency Masters | E94 King's Indian, Orthodox |
| 44. G Fischdick vs G de Boer |
| 1-0 | 40 | 1981 | Regency Masters | B82 Sicilian, Scheveningen |
| 45. H van Parreren vs G de Boer |
| 0-1 | 47 | 1981 | Regency Masters | B31 Sicilian, Rossolimo Variation |
| 46. G de Boer vs G Iskov |
| 1-0 | 31 | 1981 | Regency Masters | E92 King's Indian |
| 47. B Leverett vs G de Boer |
| ½-½ | 59 | 1981 | Regency Masters | E46 Nimzo-Indian |
| 48. G Timmerman vs G de Boer |
| 1-0 | 37 | 1982 | NED-ch sf-B | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 49. G de Boer vs D King |
| 1-0 | 27 | 1982 | Regency Masters | A30 English, Symmetrical |
| 50. G de Boer vs B Kurajica |
| 0-1 | 54 | 1982 | Regency Masters | E11 Bogo-Indian Defense |
Kibitzing
