Chess Board
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King's Indian Defence
THE GRÜNFELD DEFENCE
White has developed his QKt in an attack variation.
Black adopts the popular "hypermodern" Grünfeld, advancing his QPawn to threaten White's QBP and stop 4.P-K4 (so avoiding 4-Pawns / Averbakh lines). He invites 4.PxP..KtxP, 5.P-K4 ceding the centre so as to exploit White's weaker a1-h8 diagonal. B-Alt.
     White   Black
 1.  P-Q4    Kt-KB3
 2.  P-QB4   P-KKt3
 3.  Kt-QB3  P-Q4  Transp.from Marshall
WHITE to Move or Undo or Jump or Clear
 
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Chess Board

WHITE moves Queen's Bishop:

B-B4 (Bf4) or B-Kt5 (Bg5) ?

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