[ECO code E41 > 42]
(to) Rubinstein / Hübner Variations
Black advances his QBPawn enabling 5..Kt-QB3 behind, challenging White's QP and delaying ..P-Q4 until (usually better) after a White B-Q3. B-Alt.
White Black 1. P-Q4 Kt-KB3 2. P-QB4 P-K3 3. Kt-QB3 B-Kt5 4. P-K3 P-B4
WHITE to or Undo or Jump or Clear
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