Chess Board
[ECO code C39] Move Move Here
Berlin Defence

White's QPawn advance to the centre frees his QB to threaten Black's doubled KBP (it being better to continue developing than just recoup by 6.KtxKtP).
Black's QP push frees his QB and attacks the KKt.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	P-Q4!  P-Q3
 2. P-KB4  PxP
 3. Kt-KB3 P-KKt4
 4. P-KR4  P-Kt5
 5. Kt-K5  Kt-KB3

WHITE to Move or Undo or Jump or Clear
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