Chess Board
[ECO code D12]
SLAV DEFENCE
"5.B-Q3" Variation
White castles to avoid a Black bishop-pin otherwise likely after his planned 7.Kt-QB3.
Black develops his Queen's Knight to Q2(d7) to defend his K4(e5) square against a pawn attack.
    White  Black	White  Black
 1. P-Q4   P-Q4	     6.	0-0    QKt-Q2
 2. P-QB4  P-QB3
 3. Kt-KB3 Kt-B3
 4. P-K3   B-B4
 5. B-Q3   P-K3
Example ends: Undo or Jump or Clear