Game |
| Result | Moves |
Year | Event/Locale | Opening |
26. S Sazontiev vs Sosonko |
| 1-0 | 42 | 1970 | Leningrad Championship | D42 Queen's Gambit Declined, Semi-Tarrasch, 7.Bd3 |
27. Sosonko vs M Stean |
| 0-1 | 57 | 1972 | Islington Open | D97 Grunfeld, Russian |
28. Sosonko vs Timman |
 | 1-0 | 28 | 1973 | Nijmegen | A89 Dutch, Leningrad, Main Variation with Nc6 |
29. Sosonko vs T van Scheltinga |
| 1-0 | 31 | 1973 | Dutch Championship | D30 Queen's Gambit Declined |
30. R Hartoch vs Sosonko |
| ½-½ | 45 | 1973 | Dutch Championship | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
31. Sosonko vs E Scholl |
| 1-0 | 40 | 1973 | Dutch Championship | D97 Grunfeld, Russian |
32. Sosonko vs C Zuidema |
| ½-½ | 22 | 1973 | Dutch Championship | E02 Catalan, Open, 5.Qa4 |
33. B Enklaar vs Sosonko |
| ½-½ | 60 | 1973 | Dutch Championship | B64 Sicilian, Richter-Rauzer Attack |
34. Sosonko vs J van Baarle |
| ½-½ | 21 | 1973 | Dutch Championship | B08 Pirc, Classical |
35. F Henneberke vs Sosonko |
| ½-½ | 37 | 1973 | Dutch Championship | D41 Queen's Gambit Declined, Semi-Tarrasch |
36. Sosonko vs P van der Weide |
| 1-0 | 35 | 1973 | Dutch Championship | A04 Reti Opening |
37. F van der Vliet vs Sosonko |
| ½-½ | 39 | 1973 | Dutch Championship | A04 Reti Opening |
38. Sosonko vs P Boersma |
| 1-0 | 41 | 1973 | Dutch Championship | A53 Old Indian |
39. J Marcus vs Sosonko |
| ½-½ | 80 | 1973 | Dutch Championship | E92 King's Indian |
40. Sosonko vs Romanishin |
| 0-1 | 30 | 1973 | Amsterdam IBM-B | A50 Queen's Pawn Game |
41. R Bellin vs Sosonko |
| 0-1 | 46 | 1973 | Amsterdam IBM-B | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
42. Sosonko vs V Kovacevic |
| ½-½ | 73 | 1973 | Amsterdam IBM-B | A54 Old Indian, Ukrainian Variation, 4.Nf3 |
43. Sosonko vs R Hartoch |
| ½-½ | 36 | 1973 | Amsterdam IBM-B | B08 Pirc, Classical |
44. H Hecht vs Sosonko |
| 1-0 | 41 | 1973 | Amsterdam IBM-B | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
45. Sosonko vs A van den Berg |
| 1-0 | 50 | 1973 | Amsterdam IBM-B | A43 Old Benoni |
46. Keene vs Sosonko |
| ½-½ | 22 | 1973 | Amsterdam IBM-B | E62 King's Indian, Fianchetto |
47. Sosonko vs E Torre |
 | ½-½ | 58 | 1973 | Amsterdam IBM-B | E97 King's Indian |
48. Jansa vs Sosonko |
 | 1-0 | 71 | 1973 | Amsterdam IBM-B | B64 Sicilian, Richter-Rauzer Attack |
49. Sosonko vs E Scholl |
| 1-0 | 31 | 1973 | Amsterdam IBM-B | D97 Grunfeld, Russian |
50. O Jakobsen vs Sosonko |
| ½-½ | 12 | 1973 | Amsterdam IBM-B | A37 English, Symmetrical |