Q xQp Pqb Rqn Qb PxN and White won

In Milic-Djurasevic (25) Black's Q3 square was weak for a different reason—His KB had strayed out to the K-side. This whole example is one long forced sequence. It is very exciting but the final outcome is not entirely clear.

When Black has castled Q-side, the sacrifice often opens the way for a mating attack:

comes to the same sort of thing:

19 NxP Q-Q2 20 N-R7+ K-B2 21 P-N5 (threatening 22 B xP mate)

21 ... B-QB1 22 BxP+ K-N2 23 Q-K3 P-Q4 24 Q-N6 + K-Rl

25 NxB Q xN 26 B-N4! followed by 27 R-Rl mating. 19 N-R7 + K-B2 20 P-N5 Threatening 21 P-N6+ KxP 22 Q-K3+ K-B2

22 P-K5 Threatening mate in one. 22 ... N-B3 23 PxQN BxP

24 NxB QxN 25 PxN QxN

26 R-Rl Q B3 27 Q-K5+ B-Q3 28 BxP/5+ K-Q2 29 Q-R5, and White had a winning attack as well as being a piece ahead in Ghizdavu-Ajansky, Albena 1971.

Kristinsson-Tal (26) is quite amus ing. White's sacrifice should force an immediate draw (who wouldn't be satisfied with a draw against Tal?) but rather than submit to this ignominious end Tal actually uses the dark squares to launch a daring counterattack, which although objectively unsound works in practice.

White recaptures with the QRP This theme is only seen when Black has castled Q-side. White's pawn on QN5 can be a dangerous weapon in itself:

15 N-N5 PxN 16 PxP N-Nl 17 N-R5 P-Q4 18 P-N6 Q-Q2 19 NxB QxN 20 R-R7 Q-B3 21 R-B7+ QxR 22 PxQ KxP 23 P-B5 1-0, Berzinish-Usov, Latvia 1962.

And then there is the case of the tornado on the QR-file—see the Karklins-McCormick example (27).

White recaptures with the KB or the queen A check on QN5 can produce all sorts of nasty consequences for Black. Pietzsch-Bobotsov, Leipzig 1965 is not so much of a sacrifice because Black's KB7 knight is hanging in one line. Nevertheless, the idea is worth noting:

17 B xP+ B-Q2 18 B xB/K7 BxB (18.. .KxB 19Q xN) 19B xP± ±

18 QxQ BxQ 19 RxB leaves Black two pawns down (19 ...NxR

19 Q-B4 N xR/R8 20QxNP-B3

21 R-Bl K-Nl 22 RxP R-KR2 23 R-N6+ 1-0 If 23 ... R-N2 24N-B5!

The typical case is Zinser-Lom-bardy, Zagreb 1969, in which the check condemns Black's king to a painful life on the central files:

26 Q-N4 ± ± 26 P-K5 Sealing the coffin. 26 ... N-B5 If 26 ... P-B3

27 Q-N4+ K-B2 28 P-N6+ KxP 29 RxB RxR 30 QxR PxP 31 B-K8+ K-R2 32 B-B7 PxP

33 Q-N8 + K-R3 34 Q-R8 + K-N4 35 QxP+ K-R5 36 N-Q4 and Black is soon mated. 27 Q-N4+ N-Q3 28 N-Q4 B-Q2 29 P-R4 P-QN3 30 P-B5! Q-B4 If 30 ... PxP 31 P xN+ Q xP 32Q-K1 + B-K3 33 N-B5 + winning the queen.

34 R-R6+ K-N4 35 Q-Q2 + followed by mate. 32 Q-Q2 P-K4

35 Q-N4+ K-B2 36 RxB RxR 37 QxR B-Q2 38 QxNP Q-N5 39QxKP+ K-Bl 40N-Q4QxNP 41 QxP Q-R4 42 Q-R8+ K-B2 43 Q-R7+ K-Bl 44 QxP and White won.

The check at QN5 can also be a disrupting influence if Black is driven into a self pin, interposing on Q2. In Koch-Simagin (28) Black, cannot capture on QN4 because of the effect of the pin after White recaptures with his queen.

Spassky-Vladimirov 29th USSR Gh 1961

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