Nimzo-Indian Defense
104 variations · E20 to E59
The idea
The bishop on b4 pins the knight.
Black puts the bishop on b4, against the knight on c3 that has to support e4. Black often trades that bishop for the knight, and White gets the bishop pair.
The opening itself
E20 · 3 moves
Nimzo-Indian Defense
Variations 104
Names and moves from lichess-org/chess-openings (CC0).