A48 - 1. d4 Nf6 2. Nf3 g6 3. Bf4 - London System

London System (A48)

Coups: 1. d4 Nf6 2. Nf3 g6 3. Bf4

└── A48 - 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 - London System (4)
    ├── A48 - 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. c3 - London System (2)
    └── A48 - 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 - London System (2)
        ├── A48 - 1. d4 Nf6 2. Bf4 g6 3. e3 Bg7 4. Nf3 O-O - London System (2)
        └── A48 - 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 d6 5. Be2 O-O - London System, with Be2 (1)