[ECO code C68]
The Alapin Gambit
Black's own KRP move to KR4(h5) under-defends his bishop - a gambit that White best declines because of 7.PxB..PxP, 8.R-K1..PxKt, 9.QxP..Q-R5!
White Black White Black 1. P-K4 P-K4 6. P-KR3 P-KR4! 2. Kt-KB3 Kt-QB3 3. B-Kt5 P-QR3 4. BxKt!? QPxB 5. 0-0 B-KKt5
Example ends: Undo or Jump or Clear