Anglo-Indian Defense, King's Knight Variation

The King's Knight Variation, 1. c4 Nf6 2. Nf3, develops the knight to its natural square, adds control of e5 and leaves White free to choose between d4, a kingside fianchetto or a purely English setup. Compared with 2. Nc3 it gives up the idea of a quick e4, so the Mikenas-Carls complex disappears, while the extra watch over e5 hinders Black's Reversed Sicilian plans with ...e5. The same position arises at least as often from the Zukertort move order, 1. Nf3 Nf6 2. c4, and after 2. Nc3 it is the most frequent second move in the Anglo-Indian.

Black's replies define recognizable formations. The most popular is 2...g6, the King's Indian Formation, which becomes the Grünfeld Formation after 2...g6 3. g3 d5. Next comes 2...e6, a flexible move that can head for Queen's Gambit Declined or Catalan-type structures depending on how White handles the d-pawn. The Scandinavian Defense, 2...d5, challenges the center at once; among the main replies it gives White the best practical results. The Old Indian Formation, 2...d6, and the Queen's Indian Formation, 2...b6, prepare ...e5 and a queenside fianchetto respectively, the latter being rare. With 2...c5 Black moves towards Symmetrical English territory.

White's own choices are equally broad. An early d4 turns the game into a Queen's Pawn opening, most often an Indian Defense reached by a route that has already ruled out some of Black's options. Development with g3 and Bg2 instead leads to Réti-style positions in which the c-pawn and the fianchettoed bishop press on d5 and the long diagonal. Because of these possibilities Black's second move is largely a matter of choosing which family of structures to allow, and players often select it to fit a 1. d4 repertoire.

The resulting play is mostly maneuvering and transpositional rather than forcing, and the amount of theory depends on the formation the players settle into. The engine regards the position as roughly balanced, preferring 2...e6, 2...c6 and 2...c5. In practice White scores somewhat better than Black, and the line is among the more frequently reached named positions.