Nimzo-Indian Defense

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4

Nimzo-Indian Defense is catalogued under ECO code E20. It is reached after 3 moves (6 half-moves): 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4. After the last move it is White to play. White opens 1. d4. It is the defining line of the Nimzo-Indian Defense family, which has 99 catalogued lines in total. Many deeper lines continue from here, listed below.

Position shown after the last move; White to play.