[ECO code B18 > 19]
The Classical Variation
Black usually develops his Queen's Bishop to KB4(f5) to attack and dislodge White's undefended knight (thus gaining time) in preference to 4..Kt-KB3 or 4..Kt-Q2. B-Alt.
White Black 1. P-K4 P-QB3 2. P-Q4 P-Q4 3. Kt-QB3 PxP 4. KtxP B-B4
WHITE to or Undo or Jump or Clear
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