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.
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.
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.
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.
Or the "pawn-epaulette," with 30... PXR 31 Q-B6 mate.
94 The Chess Combination from Philidor to Karpov
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