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The King's Indian Attack (KIA) is a chess opening system in which White adopts the setup traditionally played by Black in the King's Indian Defence, featuring pawns on e4 and d3, knights on f3 and d2, a fianchettoed bishop on g2, and kingside castling. Its popularity surged in the 1950s as grandmasters realized the value of applying the same dynamic ideas with an extra move in hand, and it was later used by legends like Bobby Fischer and Mikhail Botvinnik. The opening creates a closed, strategic battle where White's primary plan is a central pawn thrust to e5, establishing a space bind and building attacking chances against the Black king without the d4-pawn weakness common in other lines. It is most often employed against the French Defence (via 1.e4 e6 2.d3 d5 3.Nd2) or a Sicilian with an early ...e6, where Black effectively ends up a tempo down in a tame theoretical variation. Though relatively uncommon at today's top level—with Egypt's Bassem Amin its most frequent high-level practitioner—it remains a club-level favorite due to its system-like, repeatable plans, stable structure, and inherent kingside attacking potential.