Chess Board
[ECO code C29]
VIENNA GAME - Steinitz Var.
The Blackburne Variation
White's KB4(f4) pawn removes Black's KP and attacks Black's KKt on KB3(f6), compelling it to exchange (or else retreat back to base).
Black's Knight removes White's KP on K5(e4).
     White   Black
 1.  P-K4    P-K4
 2.  Kt-QB3  Kt-KB3
 3.  P-B4    P-Q4
 4.  P-Q3    B-QB4
 5.  BPxP    KtxP  Transp.from Falkbeer
Example ends: Undo or Jump or Clear