[ECO code E20]
Black (best) advances his Queen's Bishop's Pawn to QB4(c5), threatening White's QP to draw it forward or off-centre. B-Alt.
White Black 1. P-Q4 Kt-KB3 2. P-QB4 P-K3 3. Kt-QB3 B-Kt5 4. P-KKt3 P-B4
WHITE to or Undo or Jump or Clear
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