[ECO code C37 > 38]
White develops his King's Bishop to threaten Black's weak KB2(f7) and to castle rapidly, in a line safer (and perhaps better) than 4.P-KR4. W-Alt.
White Black 1. P-K4 P-K4 2. P-KB4 PxP 3. Kt-KB3 P-KKt4 4. B-B4
BLACK to or Undo or Jump or Clear
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