| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. L Shamkovich vs I Zaitsev |
| 1-0 | 41 | 1964 | Ch Moscow | C84 Ruy Lopez, Closed |
| 27. I Zaitsev vs L Berezov |
| 1-0 | 33 | 1965 | Moscow | C02 French, Advance |
| 28. Petrosian vs I Zaitsev |
 | 1-0 | 24 | 1966 | Team ch | E92 King's Indian |
| 29. I Zaitsev vs Karpov |
| ½-½ | 14 | 1966 | Russia, Leningrad | C43 Petrov, Modern Attack |
| 30. Karpov vs I Zaitsev |
| ½-½ | 23 | 1966 | 05, Leningrad | B24 Sicilian, Closed |
| 31. Karpov vs I Zaitsev |
| ½-½ | 19 | 1966 | Leningrad (15) | B10 Caro-Kann |
| 32. I Zaitsev vs E Ubilava |
| 0-1 | 33 | 1967 | USSR Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 33. I Zaitsev vs Kholmov |
| ½-½ | 24 | 1967 | URS-Spartakiada Moscow | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 34. Nezhmetdinov vs I Zaitsev |
| 0-1 | 34 | 1967 | USSR Championship | B10 Caro-Kann |
| 35. I Zaitsev vs M Steinberg |
| ½-½ | 38 | 1967 | USSR Championship | C02 French, Advance |
| 36. I Zaitsev vs A Y Smetanin |
| 1-0 | 38 | 1967 | USSR Championship | C93 Ruy Lopez, Closed, Smyslov Defense |
| 37. I Zaitsev vs L Shamkovich |
| 1-0 | 73 | 1967 | Moscow (Russia) | B14 Caro-Kann, Panov-Botvinnik Attack |
| 38. V Osnos vs I Zaitsev |
| 1-0 | 39 | 1967 | USSR Championship | E60 King's Indian Defense |
| 39. Bronstein vs I Zaitsev |
| 1-0 | 36 | 1967 | Moscow | C88 Ruy Lopez |
| 40. I Zaitsev vs I Belov |
| 1-0 | 67 | 1967 | USSR Championship | B50 Sicilian |
| 41. I Zaitsev vs Antoshin |
| 1-0 | 41 | 1967 | Moscow Jubilee | C87 Ruy Lopez |
| 42. I Zaitsev vs Cherepkov |
| ½-½ | 54 | 1968 | USSR Championship 1968/69 | B48 Sicilian, Taimanov Variation |
| 43. Balashov vs I Zaitsev |
| 0-1 | 38 | 1968 | USSR 5/282 | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 44. Tseshkovsky vs I Zaitsev |
| 1-0 | 39 | 1968 | USSR Championship 1968/69 | C89 Ruy Lopez, Marshall |
| 45. I Zaitsev vs Bronstein |
| 0-1 | 30 | 1968 | Moscow | B10 Caro-Kann |
| 46. Gulko vs I Zaitsev |
| 0-1 | 33 | 1968 | Moskva II 5/83 | D02 Queen's Pawn Game |
| 47. I Zaitsev vs Suetin |
| 1-0 | 21 | 1968 | Moscow | B89 Sicilian |
| 48. Nikitin vs I Zaitsev |
| 0-1 | 41 | 1968 | USSR Championship 1968/69 | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 49. I Zaitsev vs V Liberzon |
| ½-½ | 42 | 1968 | USSR Championship 1968/69 | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 50. Lutikov vs I Zaitsev |
| ½-½ | 15 | 1968 | USSR Championship 1968/69 | C90 Ruy Lopez, Closed |
Kibitzing
