| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. Sosonko vs B Enklaar |
| 1-0 | 65 | 1973 | Dutch Championship playoff | A43 Old Benoni |
| 52. C Zuidema vs Sosonko |
| ½-½ | 48 | 1973 | Dutch Championship playoff | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 53. B Enklaar vs Sosonko |
 | 1-0 | 79 | 1973 | Dutch Championship playoff | B32 Sicilian |
| 54. Sosonko vs C Zuidema |
| 1-0 | 39 | 1973 | Dutch Championship playoff | D37 Queen's Gambit Declined |
| 55. H Ree vs Sosonko |
| ½-½ | 16 | 1973 | Amsterdam SB | D35 Queen's Gambit Declined |
| 56. Sosonko vs J H Donner |
| 1-0 | 67 | 1973 | Amsterdam SB | E97 King's Indian |
| 57. Timman vs Sosonko |
| 0-1 | 56 | 1973 | Amsterdam SB | B50 Sicilian |
| 58. Sosonko vs H Ree |
| ½-½ | 29 | 1973 | Amsterdam SB | D11 Queen's Gambit Declined Slav |
| 59. J H Donner vs Sosonko |
| 1-0 | 48 | 1973 | Amsterdam SB | E53 Nimzo-Indian, 4.e3 |
| 60. Sosonko vs Timman |
| ½-½ | 29 | 1973 | Amsterdam SB | A46 Queen's Pawn Game |
| 61. H Ree vs Sosonko |
| 1-0 | 40 | 1973 | Amsterdam SB | A18 English, Mikenas-Carls |
| 62. Sosonko vs J H Donner |
| ½-½ | 34 | 1973 | Amsterdam SB | D18 Queen's Gambit Declined Slav, Dutch |
| 63. Timman vs Sosonko |
| 1-0 | 24 | 1973 | Amsterdam SB | B72 Sicilian, Dragon |
| 64. Sosonko vs H Ree |
| ½-½ | 28 | 1973 | Amsterdam SB | D78 Neo-Grunfeld, 6.O-O c6 |
| 65. J H Donner vs Sosonko |
| ½-½ | 41 | 1973 | Amsterdam SB | D35 Queen's Gambit Declined |
| 66. Sosonko vs Timman |
| ½-½ | 21 | 1973 | Amsterdam SB | A47 Queen's Indian |
| 67. Sosonko vs H Bouwmeester |
| 1-0 | 29 | 1973 | NED-ch Team | E04 Catalan, Open, 5.Nf3 |
| 68. Sosonko vs J Szmetan |
| ½-½ | 16 | 1974 | Nice Olympiad qual-8 | E66 King's Indian, Fianchetto, Yugoslav Panno |
| 69. Sosonko vs Quinteros |
| 1-0 | 70 | 1974 | Hoogovens | A40 Queen's Pawn Game |
| 70. Adorjan vs Sosonko |
| ½-½ | 36 | 1974 | Hoogovens | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 71. Sosonko vs H Ree |
| ½-½ | 24 | 1974 | Hoogovens | C91 Ruy Lopez, Closed |
| 72. I Radulov vs Sosonko |
| ½-½ | 22 | 1974 | Hoogovens | B64 Sicilian, Richter-Rauzer Attack |
| 73. Sosonko vs K Langeweg |
| 1-0 | 26 | 1974 | Hoogovens | D78 Neo-Grunfeld, 6.O-O c6 |
| 74. H Hecht vs Sosonko |
| ½-½ | 19 | 1974 | Hoogovens | A06 Reti Opening |
| 75. Sosonko vs A Planinc |
| ½-½ | 22 | 1974 | Hoogovens | A31 English, Symmetrical, Benoni Formation |
Kibitzing
