Chess Opening Theory/1. d4/1...Nf6/2. Bf4/2...e6/3. e3/3...b6

Accelerated London/Queen's Indian defence Accelerated London system/Horwitz defence 3...b6 3...b6 prepares to fianchetto the queenside bishop. From b7, the bishop will help control the centre from afar. Black is playing in a Queen's Indian defence style, an opening that usually arises after 1. d4 Nf6 2. c4 e6 3. Nf3 b6. As usual in the London system, White's plans are to play Nf3, Bd3, and Nd2 in any order. Black will fianchetto their queenside bishop and develop their kingside bishop to e7. As they have not committed to ...d5 yet, Black is able to later play ...d6 to control the e5 square and end White's ambition of planting their knight on e5. Theory table References See also London System