[ECO code D02]
(to) London System
White pushes his Queen's Bishop's Pawn out one square to quadruple support for his threatened QP.
White Black 1. P-Q4 P-Q4 2. Kt-KB3 Kt-KB3 3. B-B4 P-B4 4. P-K3 Kt-B3 5. P-B3
BLACK to or Undo or Jump or Clear
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