Chess Board
[ECO code C60]
RUY LOPEZ
Barnes Defence
White's King moves to Q1(d1), forfeiting the right to castle [not 10.Kt-B3..QxKP+ch with equality].
Black's Queen on QR4(a5) returns to Q1(d8) for 11..P-Q4 [10..QxKP?, 11.R-K1 pins]. Wh.=advantage.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	QxP    Q-B3
 2. Kt-KB3 Kt-QB3    7.	P-K5   Q-Kt3
 3. B-Kt5  P-KKt3    8.	Q-Q3   P-QB3
 4. P-Q4!  KtxP	     9.	B-QB4  Q-R4 ch
 5. KtxKt  PxKt	    10.	K-Q1   Q-Q1
Example ends: Undo or Jump or Clear