Chess Board
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BISHOP'S OPENING
The Berlin Defence
White's KB controlled Q5(d4) and attacked KB7(f7).
Black develops his King's Knight to attack White's KP (a hallmark of any Berlin) and gain time, contest for Q4(d5) and prevent a 3.Q-KR5 Scholar's Mate. Titled after a London-Berlin 1839 correspondence match that caused the Bishop's to near vanish from top play, but known since 1561 (Lopez). B-Alt.
     White  Black
 1.  P-K4   P-K4
 2.  B-B4   Kt-KB3  Transp.from Alek.D.
WHITE to Move or Undo or Jump or Clear
 
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Chess Board

WHITE moves Queen's Pawn:

P-Q3 (d3) or P-Q4 (d4) ?

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