The Kasparov-Petrosian Variation, Classical Variation is a variation of the Queen's Indian Defense, catalogued as ECO E12. The line runs 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 exd5, reaching the position shown below after 12 half-moves.
Both sides have pawns in the centre (White on d4, Black on d5). Development is level at two minor pieces each. It is White to move after six moves.
On the Queen's Indian Defense generally: A flexible defense to 1.d4 where Black fianchettoes the queen's bishop to control e4.
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The Kasparov-Petrosian Variation, Classical Variation goes 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 exd5. It is a variation of the Queen's Indian Defense and is catalogued as ECO E12.
The Kasparov-Petrosian Variation, Classical Variation is ECO E12. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Queen's Indian Defense.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 exd5 at +0.33 at depth 18, which is a slight pull for White, within normal opening margins. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
Both sides have pawns in the centre (White on d4, Black on d5). Development is level at two minor pieces each. It is White to move.