[ECO code D12]
(to) "5.B-Q3" / Landau /Amsterdam Vars.
White's King's Pawn push triples his QP support and frees his KB to defend his earlier gambit QBP, a line that Black can pursue or transpose (by 4..P-K3) into a Semi-Slav defence. W-Alt.
White Black 1. P-Q4 P-Q4 2. P-QB4 P-QB3 3. Kt-KB3 Kt-B3 4. P-K3 Alt. 4W,3W route
BLACK to or Undo or Jump or Clear
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