Nimzo-Indian Defense: St. Petersburg Variation

An entry in the Encyclopedia of Chess Openings (ECO E43), reached after 8 half-moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6.

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5.Ne2 3 lines
5.Bd3 1 line
- E43 with Ne4

About this opening

Nimzo-Indian Defense: St. Petersburg Variation is an opening in the Encyclopedia of Chess Openings, classified under code E43. ECO group E (E00–E99) covers Indian defences against 1.d4, covering the Nimzo-Indian, Queen's Indian, King's Indian and Catalan systems. This particular variation is reached after 8 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6.

It belongs to the Nimzo-Indian Defense family. Within that family this is a sub-variation (the St. Petersburg Variation line).

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nc3 Bb4, 4.e3 b6. From this position 2 named continuations are recorded in the encyclopaedia, each leading to a distinct theoretical line.