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1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 · ECO E90
King's Indian Defense: Normal Variation, Rare Defenses is a chess opening that arises after 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3. It is classified E90 in the ECO system, and the position after these moves has black to move. The King's Indian Defense lets White build a large pawn centre unopposed, then attacks it from a fianchettoed setup. Black deliberately concedes space in the opening in order to strike back with e5 or c5 and generate a kingside attack that is often decisive.
The classic King's Indian is a race: White plays on the queenside where the space advantage is, Black pushes pawns at the white king on the other wing. Because both attacks proceed independently, the games are unusually sharp and rarely end in draws.
Attacking players who want unbalanced positions with Black and are willing to accept worse positions objectively for practical winning chances.
This line is a variation within the King's Indian Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3.
Each of these is a named opening reached by playing on from 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3. Open any of them to load the position on the board.