Chess Board
[ECO code C42]
PETROFF'S DEFENCE - Lasker Variation
White develops his Queen's Bishop to KKt5(g5) pinning Black's king's-side knight to its queen.
Black develops his Queen's Bishop to K3(e6) and breaks the Q-to-Q pin. Can give a slight advantage over equality lines 7..B-Kt5, 7..QxQ+ch and 7..QKt-Q2!.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	P-Q3   Kt-KB3
 2. Kt-KB3 Kt-KB3    7.	B-Kt5  B-K3
 3. KtxP   P-Q3
 4. Kt-KB3 KtxP
 5. Q-K2   Q-K2
Example ends: Undo or Jump or Clear