Chess Board
[ECO code C82]
OPEN RUY LOPEZ - Mackenzie Variation
White's QRP pushes on to QR5(a5) to attack the QKt6(b6) bishop. Black's Bishop retreats and now White can gain space after 15.QKt-Q4..KtxKt etc.
    White  Black	White  Black
 1. P-K4   P-K4	     8.	PxP    B-K3
 2. Kt-KB3 Kt-QB3    9.	P-B3   B-QB4
 3. B-Kt5  P-QR3    10.	QKt-Q2 0-0
 4. B-R4   Kt-B3    11.	B-B2   P-B4
 5. 0-0    KtxP	    12.	Kt-Kt3 B-Kt3?!
 6. P-Q4   P-QKt4   13.	P-QR4! P-Kt5
 7. B-Kt3  P-Q4!    14.	P-R5!  B-R2
Example ends: Undo or Jump or Clear