About this opening
Queen's Indian Defense: Kasparov-Petrosian Variation, Classical 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 12 half-moves from the
starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 exd5.
It belongs to the Queen's Indian Defense family.
Within that family this is a level-2 branch (the Kasparov-Petrosian Variation → Classical Variation line). The immediate parent line is Queen's Indian Defense: Kasparov-Petrosian Variation, transitioned via 6…exd5.
The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nf3 b6, 4.a3 Bb7, 5.Nc3 d5, 6.cxd5 exd5. 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.
Use the interactive board above to walk through the moves position-by-position. Click any move in the navigation to step backwards, or use the keyboard arrow keys. For statistical data — how often master-level players have reached this position, White's win-rate, draw frequency, Black's score — see the panel in the right column.
Caissly's coverage of E12 extends through every named sub-variation in this line and across all four locales (English, Spanish, Portuguese, Russian). Where editorial commentary exists for a specific variation it appears as the page body; otherwise the page presents the structural data, board, and statistics as shown here.