The King’s Indian Defense is one of the most popular replies for black against white’s 1.d4. It is the perfect weapon for the active player who likes to be aggressive and is not afraid of complications. The opening is well-known for the dangerous attacks that black can start on the kingside, which has produced many brilliant games.
The main plan for black is the advance e7-e5, after which white has a choice. If the center is closed with d4-d5, then black usually starts preparing the pawn storm on the kingside.