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Chess Opening Theory/1. d4/1...Nf6/2. c4/2...e6/3. Nc3/3...Bb4/4. Bg5/4...h6/5. Bh4/5...c5
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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
.
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5
6
7
8
Leningrad Variation
e3cxd4
exd4d5
=
d5d6
e3Bxc3
bxc3e5
=
Averbakh Gambit
...b5
dxe6fxe6
cxb5d5
∞
Nimzo-Indian Defence