Keymer is, as usual, very well-prepared and handles the opening well.
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  8. a1c1 Nowadays more popular than 8.Qd2. 8... d5c3 The main move and a regular choice of Dreev. 9. b2c3  9... f8a3  10. c1c2 