Chess Board
[ECO code C29]
VIENNA GAME - Paulsen Attack
Bardeleben Var. - The Heyde Variation
Black's KBPawn to KB4(f5) defended his centre knight and QP against White's developed queen.
White advances his Queen's Pawn to Q4(d4) supporting his KP, and frees his QB for development.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	P-Q4
 2. Kt-QB3 Kt-KB3
 3. P-B4   P-Q4
 4. BPxP   KtxP
 5. Q-B3   P-KB4
Example ends: Undo or Jump or Clear