Chess Board
[ECO code A47] Move Move Here
(to) Marienbad System

Black's QKtP signalled a queen's-side fianchetto.
White pushes his King's Knight's Pawn out as per the general rule best fianchetto your KB if your opponent does so with his QB, planning to control his K4(e4) via the long (centre) light diagonal. W-Alt.
     White   Black
 1.  P-Q4    Kt-KB3
 2.  Kt-KB3  P-QKt3
 3.  P-KKt3	    Transp.from Barcza

BLACK to Move or Undo or Jump or Clear
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