The Kavalek System against the King's Indian Fianchetto Variation begins 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c6 7.O-O Qa5. Developed in the 1960s by the Czech-born American GM Lubomir Kavalek, the line offers a very flexible response to the positionally challenging white Fianchetto.