The Leningrad Variation arises in the Nimzo-Indian after 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 (ECO E30). White brings the bishop out to g5 at once, pinning the knight on f6 and creating pressure in the centre.
White's idea is to exploit the pin and develop the initiative quickly, without fussing over the exchange on c3. A sharp piece struggle follows in which both sides have to be accurate.
The Leningrad Variation is an aggressive, concrete treatment of the fight against the Nimzo-Indian. Soviet masters explored it in depth; it leads to tactically dense positions.
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