Chess Opening Theory/1. d4/1...Nf6/2. c4/2...e6/3. Nc3/3...Bb4/4. Bg5/4...h6/5. Bh4/5...c5

= Nimzo-Indian Defence, Leningrad Variation =

5...c5
Black starts to attack the center. Taking on c5 collapses White's center for no good reason, and after 6. e3 cxd4 7. exd4 d5 nothing is wrong with White's position, but it is tough to see where his advantage lies. The most common reply is therefore 6. d5, claiming space.

Theory table
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'''1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5'''