1. Main line 1. Nf3 d5 2. b3 Choose a line 1. Main line 1. Nf3 d5 2. b3 2. Nimzo-Larsen Attack: Norfolk Gambit 1. Nf3 d5 2. b3 c5 3. e4 3. Nimzo-Larsen Attack: Norfolk Gambit, 4. e4 1. Nf3 d5 2. b3 Nf6 3. Bb2 c5 4. e4 Close 1. Main line 1. Nf3 d5 2. b3 2. Nimzo-Larsen Attack: Norfolk Gambit 1. Nf3 d5 2. b3 c5 3. e4 3. Nimzo-Larsen Attack: Norfolk Gambit, 4. e4 1. Nf3 d5 2. b3 Nf6 3. Bb2 c5 4. e4 Next