[ECO code C44]
Black develops his King's Knight (threatening White's Kt and KP) so as to castle against White's attack, with equality.
White Black White Black 1. P-K4 P-K4 6. KtxP P-Q3 2. Kt-KB3 Kt-QB3 7. Q-Kt3 Q-Q2 3. P-Q4 PxP 8. Kt-Q5 Kt-B3 4. B-QB4 B-B4 5. P-B3 PxP
Example ends: Undo or Jump or Clear