四兵進攻

四兵進攻是西洋棋開局王翼印度防禦的一種，走法為： 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4

參考文獻

Djuric, Stefan; Komarov, Dmitry; Pantaleoni, Claudio. Chess Opening Essentials, Vol. 3: Indian Defences. New In Chess. 2009. ISBN 978-90-5691-270-3.
Golubev, Mikhail. Understanding the King's Indian. Gambit. 2006.
de Firmian, Nick. Modern Chess Openings: MCO-14. Random House. 1999. ISBN 0-8129-3084-3.
Gallagher, Joe. Beating the anti-King's Indian. Batsford. 1996. (only presents the 6...Na6!? line)
Burgess, Graham. The King's Indian for the Attacking Player. Batsford. 1993.
Crouch, Colin. Trends in the King's Indian Four Pawns Attack. Trends Publications. 1992.