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Chess Opening Theory/1. d4/1...Nf6/2. c4/2...e6/3. Nc3/3...Bb4/4. Bg5

Nimzo-Indian Defence
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Position in Forsyth-Edwards Notation (FEN)
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5

Nimzo-Indian Defence, Leningrad Variation

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4. Bg5

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White decides to match Black pin for pin, and the e4 square is once more a no man's land. More subtle is the fact that Black's knight no longer controls d5 either. For that reason, van der Sterren calls the d5 advance "the point but also the necessary consequence of 4. Bg5."[1] Either 4...h6 5. Bh4 c5 6. d5 or 4...c5 5. d5 h6 6. Bh4 is almost always played.

4. Bg5 is a fairly uncommon move against the Nimzo-Indian, being only played by 2% of Masters on the lichess opening database. With no black pawn on d5 white isn't threatening to win it like he often is against the Ragozin or Queen's Gambit Declined.

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References

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  1. van der Sterren, Paul (2009). Fundamental Chess Openings. Bracknell: Gambit Publications Ltd. p. 72. ISBN 978-1-906454-13-5.


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Chess openings quick reference
1. e4
2. Nf3
With 2...Nc6:
With other 2nd moves:
2. Other
1... other
1. d4
Flank
Unorthodox