[ECO code A91 > 99]
(to) Stonewall / Ilyin-Genevsky Vars.
Black (best) develops his King's Bishop to K2(e7) to deter a possible Kt/queen pin, and enables rapid castling. B-Alt.
White Black 1. P-Q4 P-KB4 2. P-QB4 P-K3 3. P-KKt3 Kt-KB3 4. B-Kt2 B-K2
WHITE to or Undo or Jump or Clear
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