Nowadays more popular than 8.Qd2.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... c7c6  5. c1g5  5... b8d7  6. e2e3  6... d8a5 The Cambridge Springs Variation is a very solid choice. 7. c4d5  7... f6d5 