1. Main line 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 Choose a line 1. Main line 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 2. Main line, 4. d4 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 3. Center Gambit 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 exd4 5. O-O 4. Nimzowitsch Attack 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. Bxc6 5. Semi-Duras Variation 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. c4 Close 1. Main line 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 2. Main line, 4. d4 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 3. Center Gambit 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 exd4 5. O-O 4. Nimzowitsch Attack 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. Bxc6 5. Semi-Duras Variation 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. c4 Next