Chess Board
[ECO code D52]
QGD. - CAMBRIDGE SPRINGS DEF.
The Rubinstein Variation
White's KB3(f3) knight to Q2(d2) halved the QKt pin and contested K4(e4) to meet a 7..Kt-K5 threat.
Black's Q4(d5) Pawn removes the QBP on QB5(c4) to threaten 8..QxB. B-Alt.
    White  Black	White  Black
 1. P-Q4   P-Q4	     6.	Kt-B3  Q-R4
 2. P-QB4  P-K3	     7.	Kt-Q2  PxP
 3. Kt-QB3 Kt-KB3
 4. B-Kt5  QKt-Q2!
 5. P-K3   P-B3
Example ends: Undo or Jump or Clear