[ECO code C19]
Advance Var. - The Smyslov Variation
White moves his Queen's Rook's Pawn on from QR3(a3) to QR4(a4) taking control of QKt5(b5) and opening a Q-side path for his QB. W-Alt.
White Black White Black 1. P-K4 P-K3 6. PxB Kt-K2 2. P-Q4 P-Q4 7. P-QR4 3. Kt-QB3 B-Kt 4. P-K5 P-QB4 5. P-QR3 BxKt ch
Example ends: Undo or Jump or Clear