Bogo-Indian Defense, Nimzowitsch Variation

The Bogo-Indian begins with ...Bb4+, a bishop check that forces White to respond before moving other pieces from their starting squares. In the Nimzowitsch Variation, White blocks with 4.Bd2 and Black plays 4...Qe7. The queen protects the b4-bishop along the e7-d6-c5-b4 diagonal and keeps the pressure without retreating immediately.

Black preserves several choices. The bishop may exchange on d2 and alter how White's pieces protect or obstruct one another, retreat later, or remain active while Black brings the other pieces out with ...O-O, ...d6 and ...e5, or ...d5 when appropriate. White often plays g3 and Bg2, castles, and prepares e4 or Nc3, but must decide whether encouraging the bishop exchange is useful.

The move ...Qe7 places the queen on a useful square, although it may interfere with the f8-bishop and requires care in the central squares. The variation's value lies in preserving options and asking White to reveal a pawn arrangement before Black fully defines one.

This is not the same as the Retreat Variation. There Black answers Bd2 with ...Be7 and immediately gives up the pressure from b4. In the Nimzowitsch Variation, the bishop remains active and protected by the queen.