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Nimzo-Larsen Attack is a chess opening that arises after 1.b3. It is classified A01 in the ECO system, and the position after these moves has black to move. The Nimzo-Larsen Attack fianchettoes the queen's bishop immediately, aiming it at e5 and the long diagonal without committing a central pawn. It is a hypermodern system that concedes the centre early in order to attack it from a distance.
Flexible and offbeat. White develops behind the pawns and chooses a central structure late, which suits players who prefer to react to their opponent's setup rather than declare their own.
Players who want to avoid theory almost entirely and are comfortable in positions guided by understanding rather than preparation.
Each of these is a named opening reached by playing on from 1.b3. Open any of them to load the position on the board.