| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. I Zaitsev vs Karpov |
 | ½-½ | 14 |
1966 |
Russia, Leningrad | C43 Petrov, Modern Attack |
| 27. Petrosian vs I Zaitsev |
 | 1-0 | 24 |
1966 |
Team ch Moscow | E92 King's Indian |
| 28. Karpov vs I Zaitsev |
| ½-½ | 23 |
1966 |
05, Leningrad | B24 Sicilian, Closed |
| 29. Karpov vs I Zaitsev |
| ½-½ | 19 |
1966 |
Leningrad (15) | B10 Caro-Kann |
| 30. I Zaitsev vs Shamkovich |
| 1-0 | 73 |
1967 |
Moscow (Russia) | B14 Caro-Kann, Panov-Botvinnik Attack |
| 31. I Zaitsev vs E Ubilava |
| 0-1 | 33 |
1967 |
Kharkov ch35-SU | B21 Sicilian, 2.f4 and 2.d4 |
| 32. I Zaitsev vs M Steinberg |
| ½-½ | 38 |
1967 |
URS-ch35 | C02 French, Advance |
| 33. V Osnos vs I Zaitsev |
| 1-0 | 39 |
1967 |
URS-ch35 | E60 King's Indian Defense |
| 34. I Zaitsev vs Kholmov |
| ½-½ | 24 |
1967 |
URS-Spartakiada Moscow | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 35. I Zaitsev vs A Y Smetanin |
| 1-0 | 38 |
1967 |
URS-ch35 | C93 Ruy Lopez, Closed, Smyslov Defense |
| 36. Bronstein vs I Zaitsev |
| 1-0 | 36 |
1967 |
Moscow | C88 Ruy Lopez |
| 37. I Zaitsev vs I Belov |
| 1-0 | 67 |
1967 |
URS-ch35 | B50 Sicilian |
| 38. Nezhmetdinov vs I Zaitsev |
| 0-1 | 34 |
1967 |
URS-ch35 Kharkov ;URS-ch | B10 Caro-Kann |
| 39. I Zaitsev vs Antoshin |
| 1-0 | 41 |
1967 |
Moscow Jubilee | C87 Ruy Lopez |
| 40. I Zaitsev vs A Zaitsev |
| ½-½ | 20 |
1968 |
Ch URS | B10 Caro-Kann |
| 41. Balashov vs I Zaitsev |
| 0-1 | 38 |
1968 |
USSR 5/282 | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 42. Bagirov vs I Zaitsev |
| ½-½ | 25 |
1968 |
05, Alma Ata | C49 Four Knights |
| 43. Gulko vs I Zaitsev |
| 0-1 | 33 |
1968 |
Moskva II 5/83 | D02 Queen's Pawn Game |
| 44. Stein vs I Zaitsev |
| 1-0 | 39 |
1968 |
Ch URS (team) | C87 Ruy Lopez |
| 45. I Zaitsev vs Bronstein |
| ½-½ | 38 |
1968 |
Team ch URS ( 1/2 ) | B10 Caro-Kann |
| 46. I Zaitsev vs Suetin |
 | 1-0 | 21 |
1968 |
Moscow | B89 Sicilian |
| 47. I Zaitsev vs Kholmov |
| ½-½ | 17 |
1968 |
URS-chT | C42 Petrov Defense |
| 48. I Zaitsev vs Bronstein |
| 0-1 | 30 |
1968 |
Moskva | B10 Caro-Kann |
| 49. I Zaitsev vs Kholmov |
| ½-½ | 15 |
1968 |
Ch URS, Alma-Ata | C42 Petrov Defense |
| 50. I Zaitsev vs Platonov |
| 1-0 | 38 |
1968 |
Ch URS | B09 Pirc, Austrian Attack |