[ECO code D30]
The Moscow (aka. Duras) Variation
Black's King's Rook's Pawn out to KR3(h6) attacks to dislodge White's bishop pin and so enable a later ..PxP without a White P-K4 reply. B-Alt.
White Black 1. P-Q4 P-Q4 2. P-QB4 P-K3 3. Kt-KB3 Kt-KB3 4. B-Kt5 P-KR3
WHITE to or Undo or Jump or Clear
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