Nimzo-Indian Defense: what should Black play?

In the Nimzo-Indian Defense, Black primarily addresses the pressure on the b4 bishop by playing Bxc3. This exchange is the most frequent continuation, appearing in 67.6% of the 225,370 recorded games at this position, as it simplifies the structure and challenges White's control of the center. With an engine evaluation of +0.08, this move maintains near-equality while forcing White to decide how to recapture on the c3 square.

The strategic role of Bxc3

The move Bxc3 is the theoretical main line, accounting for 152,000 games in the database. By capturing the knight, Black eliminates a key defender of the e4 and d5 squares. The most common continuation follows the sequence Bxc3 Bxc3 Ne4 Qc2 Nxc3 Qxc3, where Black utilizes the Ne4 maneuver to pressure the newly placed bishop on c3. White scores 47.5% from this position, indicating a balanced struggle where Black possesses solid drawing chances and active piece play.

Retreating the Bishop to e7

The second most popular choice is Be7, played in 28.1% of games (approximately 63,000 instances). This retreat avoids the immediate exchange and keeps the minor pieces on the board, though it allows White a slightly higher engine evaluation of +0.51. The typical response from White is the central expansion e4, leading to the line Be7 e4 d5 e5 Ne4 Nxe4. While less forcing than the capture on c3, this variation appeals to players who prefer a more maneuvering game.

Risks of alternative retreats

Other options such as Bd6 or Ba5 are significantly less effective. Bd6 carries an engine evaluation of +0.78 and has been played in 1,300 games, often leading to the sequence Bd6 e4 e5 d5 a5 Bd3. The move Ba5 is considered a mistake at the master level, with an evaluation of +2.53. White scores 67.2% against this retreat, primarily because the bishop becomes misplaced after White's expansion with Ba5 b4 c5 bxa5 cxd4 Nb5.