[ECO code A12]
(to) London Variation
Black usually develops his Queen's Bishop to KB4(f5) to triple his control of White's K4(e4) prior to completing a pawn defence by 5..P-K3. B-Alt.
White Black 1. P-QB4 P-QB3 2. Kt-KB3 P-Q4 3. P-QKt3 Kt-B3 4. P-Kt3 B-B4
WHITE to or Undo or Jump or Clear
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