The Queen's Indian Defence arises after 1.d4 Nf6 2.Nf3 b6. ECO code: A47.

Overview

The Queen\'s Indian Defence is a solid hypermodern defence where Black fianchettoes the queen's bishop to b7, exerting pressure on the a8–h1 diagonal and particularly the e4-square. The opening is a mainstay of modern chess theory.

Main Lines

• 3.c4 – The main line, entering the full Queen\'s Indian Defence (E12–E19).

• 3.g3 – White also fianchettoes, leading to a double-fianchetto battle.

• 3.Bf4 – The London System approach.

Strategic Themes & Plans

Black's bishop on b7 controls e4 and prevents White from establishing a strong pawn centre. The opening is considered one of the most solid defences to 1.d4 and has been employed by virtually every World Champion of the modern era. White typically plays for e4 using various means, while Black aims for a harmonious, flexible position.