| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. O Dementiev vs V Karasev |
| 1-0 | 33 | 1970 | USSR Championship | D85 Grunfeld |
| 27. Tseitlin vs O Dementiev |
 | ½-½ | 43 | 1970 | USSR Championship | B42 Sicilian, Kan |
| 28. O Dementiev vs V Liberzon |
| ½-½ | 32 | 1970 | USSR Championship | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 29. Korchnoi vs O Dementiev |
| ½-½ | 59 | 1970 | USSR Championship | D55 Queen's Gambit Declined |
| 30. O Dementiev vs Averbakh |
| 1-0 | 45 | 1970 | USSR Championship | B60 Sicilian, Richter-Rauzer |
| 31. I Platonov vs O Dementiev |
| 0-1 | 35 | 1970 | USSR Championship | E04 Catalan, Open, 5.Nf3 |
| 32. O Dementiev vs Karpov |
| 1-0 | 33 | 1970 | USSR Championship | B03 Alekhine's Defense |
| 33. O Dementiev vs Gipslis |
| ½-½ | 16 | 1970 | USSR Championship | B04 Alekhine's Defense, Modern |
| 34. V Doroshkievich vs O Dementiev |
| ½-½ | 27 | 1970 | USSR Championship | A06 Reti Opening |
| 35. O Dementiev vs Kholmov |
| 1-0 | 62 | 1970 | USSR Championship | B17 Caro-Kann, Steinitz Variation |
| 36. Savon vs O Dementiev |
| 1-0 | 42 | 1970 | USSR Championship | D30 Queen's Gambit Declined |
| 37. O Dementiev vs Antoshin |
| 0-1 | 37 | 1970 | USSR Championship | C41 Philidor Defense |
| 38. O Moiseev vs O Dementiev |
| ½-½ | 27 | 1970 | USSR Championship | D59 Queen's Gambit Declined, Tartakower |
| 39. V Levchenkov vs O Dementiev |
| ½-½ | 24 | 1971 | URS-ch sf Perm | B43 Sicilian, Kan, 5.Nc3 |
| 40. O Dementiev vs N Rashkovsky |
| ½-½ | 14 | 1971 | URS-ch sf Perm | E56 Nimzo-Indian, 4.e3, Main line with 7...Nc6 |
| 41. O Dementiev vs A Kapengut |
| ½-½ | 17 | 1971 | URS-ch sf Perm | E95 King's Indian, Orthodox, 7...Nbd7, 8.Re1 |
| 42. L Slutzky vs O Dementiev |
| ½-½ | 29 | 1971 | URS-ch sf Perm | E63 King's Indian, Fianchetto, Panno Variation |
| 43. A Zaitsev vs O Dementiev |
| ½-½ | 34 | 1971 | URS-ch sf Perm | A16 English |
| 44. O Dementiev vs V Doroshkievich |
| ½-½ | 15 | 1971 | URS-ch sf Perm | D59 Queen's Gambit Declined, Tartakower |
| 45. O Dementiev vs M Movsesian |
| 1-0 | 31 | 1971 | URS-ch sf Perm | E60 King's Indian Defense |
| 46. O Dementiev vs Prostakov |
| 1-0 | 39 | 1971 | URS-ch sf Perm | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 47. O Dementiev vs V Zilberstein |
| 1-0 | 30 | 1971 | URS-ch sf Perm | B85 Sicilian, Scheveningen, Classical |
| 48. G Kuzmin vs O Dementiev |
| ½-½ | 25 | 1971 | URS-ch sf Perm | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 49. O Dementiev vs A Donchenko |
| ½-½ | 41 | 1971 | URS-ch sf Perm | C16 French, Winawer |
| 50. N Krogius vs O Dementiev |
| ½-½ | 27 | 1971 | URS-ch sf Perm | E63 King's Indian, Fianchetto, Panno Variation |
Kibitzing
