Library/Openings/Queen's Indian Defense/Kasparov-Petrosian Variation/Hedgehog Variation ECO E12
Opening· 10 plies

Queen's Indian Defense: Kasparov-Petrosian Variation, Hedgehog Variation

An entry in the Encyclopedia of Chess Openings (ECO E12), reached after 10 half-moves: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 g6.

Queen's Indian Defense: Kasparov-Petrosian Variation, Hedgehog Variation ECO E12
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End of this line

No further variations branch from this position in our database. To explore neighbouring ideas:

About this opening

Queen's Indian Defense: Kasparov-Petrosian Variation, Hedgehog 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 10 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 g6.

It belongs to the Queen's Indian Defense family. Within that family this is a level-2 branch (the Kasparov-Petrosian Variation → Hedgehog Variation line). The immediate parent line is Queen's Indian Defense: Kasparov-Petrosian Variation, transitioned via 5…g6.

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nf3 b6, 4.a3 Bb7, 5.Nc3 g6. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.