[ECO code C16 > 19]
(main line) - The Advance Variation
White usually moves his endangered King's Pawn on to K5(e5), and now deters a model Black 4..Kt-KB3. W-Alt.
White Black 1. P-K4 P-K3 2. P-Q4 P-Q4 3. Kt-QB3 B-Kt5 4. P-K5
BLACK to or Undo or Jump or Clear
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