1. Main line 1. d4 Nf6 2. c4 Nc6 Choose a line 1. Main line 1. d4 Nf6 2. c4 Nc6 2. Horsefly Gambit 1. d4 Nf6 2. c4 Nc6 3. d5 Ne5 4. f4 Close 1. Main line 1. d4 Nf6 2. c4 Nc6 2. Horsefly Gambit 1. d4 Nf6 2. c4 Nc6 3. d5 Ne5 4. f4 Next