King's Indian Defence, Four Pawns Attack The Four Pawns Attack in the King's Indian Defence is a chess opening that begins with the moves: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 White immediately builds up a large pawn centre in order to gain a spatial advantage. Black first develops his pieces, then tries to attack White's centre by means of the pawn advances ...e7–e5, ...c7–c5 or ...f7–f5, depending on circumstances. This formation has never attracted serious interest in high-level play, although Alexander Alekhine used it three times in the 1924 New York City tournament with a score of +1−0=2. Danish grandmaster Bent Larsen also occasionally experimented with the Four Pawns Attack. The main variations of the Four Pawns Attack are: The main line 5...0-0 6.Nf3 c5, when after 7.d5 Black can attack White's centre with the pawn sacrifice 7...b5 or the quieter 7...e6. The latter can transpose into the Modern Benoni. The modern alternative 5...0-0 6.Nf3 Na6!? aims at sacrificing a pawn with 7...e5 and going into tactical complications. The relevant Encyclopaedia of Chess Openings codes are E76 through E79. Wikipedia is an excellent starting point to research the opening.