Nimzo-Indian defence

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The Nimzo-Indian defence is a popular chess opening with these initial moves: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4. The basic idea is for Black to challenge for control of the central square e4. This comes at the cost of exchanging his Bb4 for the white Nc3 when White plays a3. The opening is named after Aaron Nimzovich, who developed and promoted it. Initially a hypermodern opening, it usually transposes (changes) into classical form, as black occupies central squares by ...c5 and ...d5.

The Nimzo-Indian defence
Start of chess board.
a8 black rook b8 black knight c8 black bishop d8 black queen e8 black king f8 __ g8 __ h8 black rook
a7 black pawn b7 black pawn c7 black pawn d7 black pawn e7 __ f7 black pawn g7 black pawn h7 black pawn
a6 __ b6 __ c6 __ d6 __ e6 black pawn f6 black knight g6 __ h6 __
a5 __ b5 __ c5 __ d5 __ e5 __ f5 __ g5 __ h5 __
a4 __ b4 black bishop c4 white pawn d4 white pawn e4 __ f4 __ g4 __ h4 __
a3 __ b3 __ c3 white knight d3 __ e3 __ f3 __ g3 __ h3 __
a2 white pawn b2 white pawn c2 __ d2 __ e2 white pawn f2 white pawn g2 white pawn h2 white pawn
a1 white rook b1 __ c1 white bishop d1 white queen e1 white king f1 white bishop g1 white knight h1 white rook
End of chess board.
White to move
1.d4 Nf6
2.c4 e6
3.Nc3 Bb4
4.e3 0-0
5.Bd3 d5
6.Nf3 c5
7.0-0 Nc6
8.a3 Bxc3
9.bxc3 dxc4
10.Bxc4 Qc7

The white central pawns are under restraint. Much preparation is needed before they can move forward.