Here White has many varied possibilities. Thus 20 P-B5 P-N3 21 P-N4 N-N2 seems natural, and now, by playing 22 B-K3, White firmly seizes the QR-file. This is perfectly sound, but it is true that it remains unclear what domination of the only open file would have given.

Seemingly not the best, although by this move White forces the black queen to go to . . . QN2. More consistent, however, was 24 R-Bl, so that if 24 . . . R-R7 the rook can be repelled from the second rank with 25 B-Nl and only then play 26 Q-Q2.

25 QR-B1 5

A crucial decision - to concede the QR-file to the opponent. On the other hand, if one pair of rooks is exchanged then White is left with fewer winning chances. If you want to win - give your opponent counterplay!

29R-KN1 7 BxB 10

I do not think very much of this manoeuvre - the black pieces have become very passive. In guarding ... KN3 an extra time, Black finally unties his opponent's hands for a K-side attack. I think that transferring the queen to . . . Q1 by . . . Q-N3-Q1 was more useful here.

Black must go in for this exchange immediately, otherwise White plays

34 N-R2 and eliminates even this possibility.

34 RPxP 1 Q-Q2

I dare say the simplest move was

35 R-B2 keeping in reserve the threat P-B6. That would have posed Black very difficult problems, the more so because at this moment there were only four minutes left on Spassky's clock. But instead of this I myself made some unimportant moves.

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