RxRBxRQl

30R-B2 BxP

31N-B4 BxP

32 RxP+J RxR

34 NxR R-N4

And now 35 N xB P xN 36 K-Bl would have offered White good winning chances—He can eventually create two connected passed pawns on the Q-side.

Kristinsson-Tal Reykjavik 1964

13 N/4 xNP The start of a drawing combination. 13 ... P xN 14 NxP Q-B3 15 N-R7NxB? Typical Tal, disdaining the draw that would come after 15 ... Q-QB2 16 N-N5 Q-B3 etc. 16 N x Q B-B4 Not 16...RxN 17 R-B3 when Black has nothing. 17 K-R2? Justifying Tal's counter-sacrifice. 17 N-R5 would also be bad on account of 17 ... BxKP or 17 ... B-Rl. But White has a neat resource in 17 P-QN4 B-N3 18 P-B4! NxR+ 19 P-QB5 N-N6

20 Q-K3 N/3-R4 21 PxB, when Black's knights are frozen and White's Q-side pawns will run very quickly. 17... N x R 4- 18 R x N B x N Now Black's minor pieces are all active and White's Q-side pawns have much further to go than in the last note. 19 P-B4 P-Q3 20 Q-QB2 B-Q5

21 P-QN4 P-K4 22 P-KB5 K-K2 23 P-QR4 P-N3 24 P-N5 B-Rl 25 Q-K2 QR-KN1 26 P-R5 P-R4 27 P-N3 R-R2 28 K-N2 R/2-N2 29 PxP RxP 30 R-B3 N-R2 31 Q-Kl N-N4 32 R-Bl NxKP 33BXNRxP+ 34K-R2R-N7 + 35 K-Rl R-N84- 36RxRRxR + 37 Q xR B xB + 0-1

Karklins-McCormick US Open Ch 1971

17N-N5! RPxN

18 PxP PxN

If 18 . .. P-N3 19 R-R3! threatening 20 R/l-Rl as well as 20 R-B3, or 18...N-B4 19P-N4! 19R-R8+ N-Nl 20 KP xP B-B5

21BN6 QK2

If 21 ... Q-Q2 22 B-R7 and the king has no escape square.

22 BxR QxB

26 B-B8+ K-Ql 27 B-K6+ and if 25 ... B-N2 26 B-B6+ NxB

27 P xN+ K xP 28 Q-R8+ K-Q2 29 R x R with a winning material advantage.

If 27 ... K-K2 28 R/1-Q8 (threatening 29 P-B6+) 28 . .. P-B3

29 P-N6 and the pawn promotes.

Koch-Simagin Corres 1965/68

If 18... PxN 19 Q xP+ R-Q2 (or 19 ... Q-Q2 20 BxB) 20BxP Q-Bl 21 BxBQxB 22R-Q1 B-Ql (or 22 ... NxKP 23 P-R5!)

23 N-K4! ± ±

19 B xP!

BxB

20 Q xB

QxB

21 P-R5!

Q-B4

22 QxP+

K-Q2

23 N-R4!

QxN

24N-N6 +

K-B3

If 24... Q xN Black's three minor pieces are insufficient against 25 PxQ KR-B1 26 R-Ql + followed by 27 QxKP+ or 25 ... N-N4 26 R-Ql + K-B3 27 Q x B N-B7 + 28 K-Nl N x R 29 Q-QB7 + K-N4 30 P-B4+ K-N5 31 P-N7.

25 ... Q xRP loses to 26 P-N4! QxN 27 QxKP+ K-N2 28 R-B7+ winning the queen at once and mating soon after, while on 25 ... KR-B1? 26 RxR RxR White mates in two.

26 Q-R3 N-N4 Otherwise 27 R-B7, threatening

30 R xO

Rogulj-Georgiev Varna 1977

13N/3xP!

It is important here to capture with the correct knight. 13 N/4xNP Q-Nl leaves Black with couriterplay, but now

15 PxP QxKP

A better defensive try might have been 15 . . . N-Q4, blocking one line of attack.

16 KR-K1 QrB5+

If 16. . . Q-N4+ 17 K-Nl N-N5 18 NxP! PxN 19 R-Q7+ K-B3 20 R-KB1+ winning.

After 18 . . . K-Q3 19 P-B4, Black can exchange queens with 19 ... Q-B4+ 20 QxQ PxQ, but the endgame is lost.

19 BxB R-QN1

If 19 . . . R R2 20 Q-QB3 N-Q2 21 R-Q4 Q-Nl 22 R/l-Ql, and Black's extra piece is of no use against White's onslaught.

20 QrR31 Q-N5

Uhlmann-Ljubojevic Niksic 1978

This position shows that even the world's leading players sometimes allow one of the thematic sacrifices that will bash the Sicilian flat within a few moves. Here the leading Yugoslav Grandmaster Ljubomir Ljubojevic, who many regard as an eventual challenger for the world title, has left his king in the centre and his QP poorly protected. The result is a massacre.

12 NxP Q-B3

13 . . . K-Bl 14 Q-N4 is equally horrible, e.g. 14 . . . N-K2 15 N-B5 and 16 R Q8+ (or 15 B BS, threatening simply 16 NxB and 17 BxN+).

14 <£-N4 K-B3 Otherwise the double check will be killing.

mate.

Mlagmasnren-Martens

Leningrad 1960

1P-K4

P-QB4

2N-KB3

P-K3

3 P-Q4

PxP

4 NxP

N-KB3

5 N-QB3

P-Q3

6B-KN5

B-K2

7Q-B3

After 7 P-B4 P-KR3, White would not be able to retreat 8 B-R4 because of8 .. .NxP.

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