Queen's Indian defence

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The Queen's Indian defence is an important defence to 1.d4. It features a fianchetto of Black's QB.

The Queen's Indian defence
Start of chess board.
a8 black rook b8 black knight c8 black bishop d8 black queen e8 black king f8 black bishop g8 __ h8 black rook
a7 black pawn b7 __ c7 black pawn d7 black pawn e7 __ f7 black pawn g7 black pawn h7 black pawn
a6 __ b6 black pawn c6 __ d6 __ e6 black pawn f6 black knight g6 __ h6 __
a5 __ b5 __ c5 __ d5 __ e5 __ f5 __ g5 __ h5 __
a4 __ b4 __ c4 white pawn d4 white pawn e4 __ f4 __ g4 __ h4 __
a3 __ b3 __ c3 __ d3 __ e3 __ f3 white knight 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 white knight c1 white bishop d1 white queen e1 white king f1 white bishop g1 __ h1 white rook
End of chess board.
White to move

It starts as follows:

1.d4 Nf6
2.c4 e6
3.Nf3 b6
and now 4e3, 4Nc3 and 4g3 are all possible. So is 4.a3, which prepares 5.Nc3 by preventing Black's 5...Bb4. This is the most usual line:
Start of chess board.
a8 black rook b8 black knight c8 __ d8 black queen e8 __ f8 black rook g8 black king h8 __
a7 black pawn b7 black bishop c7 black pawn d7 black pawn e7 black bishop f7 black pawn g7 black pawn h7 black pawn
a6 __ b6 black pawn c6 __ d6 __ e6 black pawn f6 __ g6 __ h6 __
a5 __ b5 __ c5 __ d5 __ e5 __ f5 __ g5 __ h5 __
a4 __ b4 __ c4 white pawn d4 white pawn e4 __ f4 __ g4 __ h4 __
a3 __ b3 __ c3 white queen d3 __ e3 __ f3 white knight g3 white pawn h3 __
a2 white pawn b2 white pawn c2 __ d2 __ e2 white pawn f2 white pawn g2 white bishop h2 white pawn
a1 white rook b1 __ c1 white bishop d1 __ e1 __ f1 white rook g1 white king h1 __
End of chess board.
Black to move after 9.Qxc3
4.g3 Bb7 (4...Ba6 is also played here)
5.Bb2 Be7
6.0-0 0-0
7.Nc3 Ne4
8.Qc2 Nxc3
9.Qxc3