Queen's Indian Defense: Classical Variation

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

ECO E17

The Queen's Indian Defense: Classical Variation is a chess opening line in the Queen's Indian Defense complex, reached after 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O.

It is catalogued under code E17 in the Encyclopaedia of Chess Openings (ECO).

The defining move O-O is chosen by White on move 6.

4 named continuations branch from this position, including the Polugaevsky Gambit and the Taimanov Gambit.

Named variations

• Queen's Indian Defense: Classical Variation, Polugaevsky Gambit — ECO E17
• Queen's Indian Defense: Classical Variation, Taimanov Gambit — ECO E17
• Queen's Indian Defense: Classical Variation, Tiviakov Defense — ECO E18
• Queen's Indian Defense: Classical Variation, Traditional Variation — ECO E18

Study this line with a grandmaster

This position is covered in the Bogo-Indian Defense course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.