Chess Board
[ECO code C48]
LOPEZ FOUR KNIGHTS GAME
Ranken Variation
White advances his Queen's Pawn to the centre, attacking Black's queen.
Black's Queen on K4(e5) moves to KB4(f5), or otherwise 10.Q-Q4, with equality.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	KtxP   KtxP
 2. Kt-KB3 Kt-QB3    7.	KtxKt  Q-Q5
 3. Kt-B3  Kt-B3     8.	0-0    QxKt[K4]
 4. B-Kt5  P-QR3     9.	R-K1   B-K3
 5. BxKt   QPxB	    10.	P-Q4   Q-KB4
Example ends: Undo or Jump or Clear