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Yuri V Nikolaevsky vs Vladimir Karasev
USSR Championship (1971), Leningrad URS, rd 19, Oct-13
English Opening: Anglo-Indian Defense. Anglo-Grünfeld Variation (A16)  ·  1/2-1/2

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Nov-16-19
Premium Chessgames Member
  woldsmandriffield:


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82 Qc5? allowed Black to establish a fortress with the King able to access h7 &g8.

Instead 82 Kd6 wins because Black is left with fewer files than he needs for the fortress: 82..Kg7 83 Kc5! (the King retreats only to advance again after the Queen controls the 8th rank) 83..Rf5+ (83..Kg6 84 Qe6+) 84 Kb4 Rf7 85 Qe6 Bf3 86 Kc5 Bb7 87 Qe8! Bf3 88 Kd6 Bb7 89 Ke6


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Black lacks the extra file needed for the fortress enabling White to breach it.

As a general endgame rule, in a Q vs R situation do not give up diagonal pins lightly.

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