Library/Openings/Queen's Indian Defense/Classical Variation/Traditional Variation ECO E18
Opening· 13 plies

Queen's Indian Defense: Classical Variation, Traditional Variation

An entry in the Encyclopedia of Chess Openings (ECO E18), reached after 13 half-moves: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3.

Queen's Indian Defense: Classical Variation, Traditional Variation ECO E18
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Black rook
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Black queen
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Black pawn
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Black knight
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About this opening

Queen's Indian Defense: Classical Variation, Traditional Variation is an opening in the Encyclopedia of Chess Openings, classified under code E18. 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 13 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.

It belongs to the Queen's Indian Defense family. Within that family this is a level-2 branch (the Classical Variation → Traditional Variation line). The immediate parent line is Queen's Indian Defense: Classical Variation, transitioned via 7.Nc3.

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 2 named continuations are recorded in the encyclopaedia, each leading to a distinct theoretical line.