Repertoire for White with 1.d4. The system 1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 is a vicious system that will leave King's Indian and Grunfeld players without any books to run to.

1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3

Part 1: Black avoids 5...0-0
Part 2: 5...0-0 6.Be2 b6
Part 3: 5...0-0 6.Be2 c6
Part 4: 5...0-0 6.Be2 c5
Part 5: 5...0-0 6.Be2 Bg4