[ECO code A47]
(to) Marienbad System
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 or Undo or Jump or Clear
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