Queen's Indian Defense: Classical Variation

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O

Queen's Indian Defense: Classical Variation is catalogued under ECO code E17. It is reached after 6 moves (11 half-moves): 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O. After the last move it is Black to play. White opens 1. d4. It is a named variation of the Queen's Indian Defense, which has 53 catalogued lines in total.

Position shown after the last move; Black to play.