Rk

The usual method of attack comes to nothing: 22 P-KR4 BxKP

23 RxB PxR 24 P-R5 Q-R2! 25 PxP BP xP 26 BxNP B-B4! 27 BxB RxB 28 P-N6 Q-KN2! 29 PxP+ K-Rl.

The text is a quicker way of creating mating threats on the KR-file. 22 ... B-B7!

24 KP x Pep B-K6 + 25 K-Nl RxP loses to 26R-Kl!, and 22 ... BxKP

to 23 R-R4 R-Kl 24 QxRP+ K-Bl 25 BxNP! PxB (or 25 ... R-R2 26 R-Bl R/1-K2 27 R-B6!)

23P-K6! Niki tin only considered 23 R-Bl Q-R2! 24 P-K6 B-N2. The text is Shamkovich's coup de grace, cutting Black's QB out of the game and threatening to win in a prosaic manner by P-KR4-R5 etc.

23 ... R-R2 Shamkovich examines two alternatives:

a) 23 ... Q-R2 24 K-Nl P xP (if 24...B-Q5 25 PxP+) 25 PxP Q-KN2 26 P-K7 Q xQ 27 B-B4 + K-Rl 28 P x Q R-Kl 29 R-KB4! B-KB4 30R xB/2 R xP 31 P-N3 ± ; and b) 23 ... PxP 24 PxP P-Q4

28 Q xP+ K-Rl 29 P-K7 B-KB4 30 PxR=Q+ ±) 28 B-B7+ K-Rl

29 PxQ BxP 30 BxB 'with a roughly equal ending'.

This last variation seems to be crucial for the objective merit of Tal's sacrifice at move sixteen. Unless some improvement can be found for White the best that he can hope for is a marginally better ending.

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