Library/Openings/Queen's Indian Defense/Classical Variation/Traditional Variation/Main Line ECO E19
Opening· 17 plies

Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line

An entry in the Encyclopedia of Chess Openings (ECO E19), reached after 17 half-moves: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3.

Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line ECO E19
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Black rook
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White pawn
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White queen
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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: Classical Variation, Traditional Variation, Main Line is an opening in the Encyclopedia of Chess Openings, classified under code E19. 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 17 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3.

It belongs to the Queen's Indian Defense family. Within that family this is a level-3 branch (the Classical Variation → Traditional Variation → Main Line line). The immediate parent line is Queen's Indian Defense: Classical Variation, Traditional Variation, transitioned via 9.Qxc3.

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nf3 b6, 4.g3 Bb7, 5.Bg2 Be7, 6.O-O O-O. 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.