[ECO code C80]
Side Variation
White's Knight on KB3(f3) removes Black's KP on K5(e5), opens the king's file (e-file) and king's-side, and threatens Black's KB2(f7) with a real advantage.
White Black White Black 1. P-K4 P-K4 6. P-Q4 P-Q4? 2. Kt-KB3 Kt-QB3 7. KtxP! 3. B-Kt5 P-QR3 4. B-R4 Kt-B3 5. 0-0 KtxP
Example ends: Undo or Jump or Clear