The Gruenfeld Defence (1.d4 Nf6 2.c4 g6 3.Nc3 d5) enjoys a special star status in the family of Indian openings. It involves a daring, active concept: fighting for control of the centre with an early d7-d5 thrust supported only by pieces. The ensuing lines and positions promise more active play than most openings. Black has to know the critical ideas and most promising plans as most lines are pretty sharp and concrete.