Queen's Indian Defense: Petrosian Variation

An entry in the Encyclopedia of Chess Openings (ECO E12), reached after 7 half-moves: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3.

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4…Ba6 1 line
- E12 Farago Defense

About this opening

Queen's Indian Defense: Petrosian Variation is an opening in the Encyclopedia of Chess Openings, classified under code E12. 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 7 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3.

It belongs to the Queen's Indian Defense family. Within that family this is a sub-variation (the Petrosian Variation line).

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nf3 b6, 4.a3. From this position exactly one named continuation is recorded in the encyclopaedia.