Chess Board
[ECO code D30] Move Move Here
The Moscow (aka. Duras) Variation

White's QB to KKt5(g5) pinned Black's KKt to deter ..Kt-K5 and avoid Semi-Tarr./Nimzo-I. lines.
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 Move or Undo or Jump or Clear
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