A useful move and a novelty.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g2g3  3... d7d5  4. f1g2  4... f8b4  5. c1d2  5... b4d6  6. g1f3  6... e8g8  7. e1g1  7... c7c6  8. b1c3  8... d5c4  9. d2g5  9... b8d7  10. c3e4  10... d6e7  11. e4f6  11... e7f6  12. g5f6  12... d8f6  13. d1c1  13... e6e5 Now the position resembles some lines of the Queen's Gambit Declined lines, with the only difference being that  the white bishop is fianchettoed. As a rule the e6-e5 break frees Black's  position and indicates that the worst is over for the second player. 14. c1c4 