| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Piket vs Z Doda |
| ½-½ | 35 | 1970 | Hoogovens-B | A56 Benoni Defense |
| 27. K Maeder vs J Piket |
| ½-½ | 13 | 1970 | Hoogovens-B | B61 Sicilian, Richter-Rauzer, Larsen Variation, 7.Qd2 |
| 28. J Piket vs P H Clarke |
| ½-½ | 22 | 1970 | Hoogovens-B | C53 Giuoco Piano |
| 29. V Sokolov vs J Piket |
| ½-½ | 28 | 1970 | Hoogovens-B | A56 Benoni Defense |
| 30. J Piket vs A Medina Garcia |
 | 0-1 | 44 | 1970 | Hoogovens-B | C56 Two Knights |
| 31. G Antunac vs J Piket |
| 0-1 | 31 | 1970 | Hoogovens-B | A15 English |
| 32. J Piket vs T van Scheltinga |
| ½-½ | 28 | 1970 | Hoogovens-B | A19 English, Mikenas-Carls, Sicilian Variation |
| 33. K Honfi vs J Piket |
| 1-0 | 33 | 1970 | Hoogovens-B | B33 Sicilian |
| 34. J Piket vs Andersson |
| ½-½ | 55 | 1970 | Hoogovens-B | B45 Sicilian, Taimanov |
| 35. L Day vs J Piket |
| 1-0 | 83 | 1970 | Hoogovens-B | B10 Caro-Kann |
| 36. J Piket vs D Drimer |
| 0-1 | 44 | 1970 | Hoogovens-B | B10 Caro-Kann |
| 37. J Piket vs Forintos |
| 0-1 | 51 | 1970 | Hoogovens-B | B32 Sicilian |
| 38. R Hartoch vs J Piket |
| 1-0 | 40 | 1970 | Hoogovens-B | E67 King's Indian, Fianchetto |
| 39. J Piket vs D van Geet |
| 1-0 | 34 | 1970 | Hoogovens-B | B06 Robatsch |
| 40. P Smederevac vs J Piket |
| 1-0 | 43 | 1970 | Hoogovens-B | A16 English |
| 41. Timman vs J Piket |
| 1-0 | 26 | 1970 | Amsterdam IBM-B | A04 Reti Opening |
| 42. J Piket vs D Marovic |
| 1-0 | 32 | 1970 | Amsterdam IBM-B | A10 English |
| 43. D van Geet vs J Piket |
| 0-1 | 40 | 1970 | Amsterdam IBM-B | A01 Nimzovich-Larsen Attack |
| 44. J Piket vs Adorjan |
| 0-1 | 52 | 1970 | Amsterdam IBM-B | B22 Sicilian, Alapin |
| 45. Westerinen vs J Piket |
| ½-½ | 40 | 1970 | Amsterdam IBM-B | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 46. J Piket vs L Prins |
| 0-1 | 34 | 1970 | Amsterdam IBM-B | C50 Giuoco Piano |
| 47. J Bednarski vs J Piket |
| ½-½ | 21 | 1970 | Amsterdam IBM-B | B56 Sicilian |
| 48. J Piket vs P van der Weide |
| 0-1 | 28 | 1970 | Amsterdam IBM-B | A85 Dutch, with c4 & Nc3 |
| 49. S Hamann vs J Piket |
| 0-1 | 58 | 1970 | Amsterdam IBM-B | A56 Benoni Defense |
| 50. N Cortlever vs J Piket |
| 1-0 | 40 | 1970 | Amsterdam IBM-B | B32 Sicilian |
Kibitzing
