[ECO code C83]
White springs. The Knight on Q4(d4) takes bishop on K6(e6), to pin Black's QP when he recaptures (..PxKt or ..QxKt), enabling 13.RxKt to win a piece.
White Black White Black 1. P-K4 P-K4 7. B-Kt3 P-Q4! 2. Kt-KB3 Kt-QB3 8. PxP B-K3 3. B-Kt5 P-QR3 9. P-B3 B-K2 4. B-R4 Kt-B3 10. R-K1 0-0 5. 0-0 KtxP 11. Kt-Q4 Q-Q2?! 6. P-Q4 P-QKt4 12. KtxB!
Example ends: Undo or Jump or Clear