Chess Board
[ECO code A46]
COLLE SYSTEM
Polish Defence
White pushes his QBPawn out one square to defend his QP (7.P-B4..KtPxP is better for Black).
Black develops his Queen's Knight to QB3(c6) increasing the threat against White's queen's pawn.
    White  Black	White  Black
 1. P-Q4   Kt-KB3    6.	0-0    P-B4
 2. Kt-KB3 P-QKt4    7.	P-B3!  Kt-B3
 3. P-K3   P-QR3
 4. B-Q3   B-Kt2
 5. Kt-Q2  P-K3
Example ends: Undo or Jump or Clear