King's Indian Defense: Orthodox Variation

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2

ECO E91

The King's Indian Defense: Orthodox Variation is a chess opening line in the King's Indian Defense complex, reached after 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2.

It is catalogued under code E91 in the Encyclopaedia of Chess Openings (ECO).

The defining move Be2 is chosen by White on move 6.

10 named continuations branch from this position, including the Gligoric-Taimanov System and the Donner Defense.

Named variations

• King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System — ECO E92
• King's Indian Defense: Orthodox Variation, Donner Defense — ECO E94
• King's Indian Defense: Orthodox Variation, Glek Defense — ECO E94
• King's Indian Defense: Orthodox Variation, Positional Defense — ECO E94
• King's Indian Defense: Orthodox Variation, Ukrainian Defense — ECO E94
• King's Indian Defense: Orthodox Variation, Aronin-Taimanov Defense — ECO E97
• King's Indian Defense: Orthodox Variation, Bayonet Attack — ECO E97
• King's Indian Defense: Orthodox Variation, Korchnoi Attack — ECO E97
• King's Indian Defense: Orthodox Variation, Modern System — ECO E97
• King's Indian Defense: Orthodox Variation, Classical System — ECO E98

Study this line with a grandmaster

This position is covered in the King's Indian Defense with ...e5 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.