[ECO code C50]
(to) Dubois Variation
Black rarely advances his King's Bishop's Pawn to KB4(f5) challenging White's KP, although if 5.PxP he can regain the pawn by 5..P-Q4. B-Alt.
White Black 1. P-K4 P-K4 2. Kt-KB3 Kt-QB3 3. B-B4 B-B4 4. P-Q3 P-B4
WHITE to or Undo or Jump or Clear
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