Chess Board
[ECO code C60]
RUY LOPEZ
Barnes Defence
Black's KP removed White's QP and invited an exchange (a move inferior to 4..KtxP).
White develops his Queen's Bishop to KKt5(g5) attacking black's queen, and after 5..P-KB3 (or 5..B-K2) 6.B-KB4 will give slight advantage. W-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	B-KKt5!
 2. Kt-KB3 Kt-QB3
 3. B-Kt5  P-KKt3
 4. P-Q4!  PxP
Example ends: Undo or Jump or Clear