Chess Board
[ECO code D52]
QGD. - CAMBRIDGE SPRINGS DEF.
Bogoljubow Variation
White's Queen's Rook's Pawn to QR3(a3) attacks to dislodge Black's dark bishop from QKt4(b5).
Black's Bishop moves to K2(e7). Often continues 13.P-KKt3..0-0, 14.B-Kt2..B-Q7, with equality.
    White  Black     6.	Kt-B3  Q-R4
 1. P-Q4   P-Q4	     7.	Kt-Q2  B-Kt5
 2. P-QB4  P-K3	     8.	Q-B2   PxP
 3. Kt-QB3 Kt-KB3    9.	BxKt   KtxKt
 4. B-Kt5  QKt-Q2!  10.	KtxP   Q-B2
 5. P-K3   P-B3	    12.	P-QR3  B-K2
Example ends: Undo or Jump or Clear