Bxkp

A seemingly inspired sacrifice in that it is launched against a heavily defended square (e6), but its chief point is simply to clear lines for White's rooks. If now 13 ... PXB 14 N-Q5 NXN 15 PXN! (15 RXQ NXR gives Black too much wood for the Q) 15 ... Q-N3 16 NXP with a vehement attack. In particular it is impossible to defend adequately against the threats of Q-B3 or Q-R5+. Black could also try 13... PXB 14 N-Q5

Q-N1 but I cannot conceive that Black could survive after 15 N-B7+ and 16 N/3XKP.

14N-Q5 Q-Nl

16Q-Q2 N-Kl

17NXB PXN

If 17. .. KXN 18 Q-Q7+ K-B3 19 Q-B5+ K-K2 20 R-Q7 mate.

The only way in which White can proceed is to open further lines for his rooks.

20QXKP N-B3

22 R-B3

From now on the combination is easy to calculate. Black's last chance to complicate matters was with 20... P-KN3.

Or 23 ... N-R4 24 P-KN4 P-KN3 25 Q-B6! with mate by either RXN or P-N5.

24P-KN4!

25P-N5+

26QXQ+

QXR K-R4 KXP

As so often the defender has been forced to shed his Q in order to beat off the attack. In material terms Black is OK, but his pieces lack co-ordination and the continued vitality of White's Q and R spells his imminent doom.

The wheel turns again.

30RXN+

P-KN3 K-N2

Or the "pawn-epaulette," with 30... PXR 31 Q-B6 mate.

31 QXKP+

Resigns.

94 The Chess Combination from Philidor to Karpov

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