Board Position
One of the major side defences to a Queen's Pawn, where Black immediately begins to fianchetto his King's Bishop (move 2b, left) in order to control the dark centre-diagonal QR1-KR8 (a1-g8) before attempting to attack White's pawn centre. Board Position
In the strategic line White uses the same approach, awaiting the attack (move 7wb, right). The first four moves by each player are mostly interchangeable.
Being a fighting defence with a high degree of positional strategy required on both sides, White often opts for a more direct attacking variation by 3.Kt-QB3, leading to further lines such as the Classical Variation, the Four Pawns' Attack (below), the Grünfeld Defence (qv.) and the Averbakh Variation.
Begin or Clear or Groups or see move: 1 d4 Nf6 2 c4 g6 to:

(strategic): 3 g3 Bg7 4 Bg2 d6 5 Nc3 0-0 6 Nf3 Nbd7 7 0-0 e5 8 e4 c6 9 h6 exd4
(attacking): 3 Nc3 Bg7 4 e4 d6 (4Pawns:) 5 f4 0-0 6 Be2 c5 7 d5 e6 8 Nf3 exd5 9 cxd5 b5