Chess Board
[ECO code C25]
VIENNA GAME - Anderssen Def.
Hamppe Variation
White moved his queen's-side knight to QR4(a4) to attack the dark bishop on QB5(c5).
Black's Bishop promptly removes White's KBP on KB7(f2) for check, in effect forcing 4.KxB (to prevent White ever castling), for 4..Q-R5+ch and early advantage.
	White	Black
 1.	P-K4	P-K4
 2.	Kt-QB3	B-B4
 3.	Kt-R4	BxP ch
Example ends: Undo or Jump or Clear