1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. g1f3  4... d7d5  5. c4d5  5... e6d5  6. d1a4  6... b8c6  7. c1g5  7... h7h6  8. g5f6  8... d8f6  9. e2e3  9... e8g8  10. f1e2  10... c8e6  11. e1g1  11... a7a6  12. f1c1  12... b4d6  13. a4d1  13... c6e7 This version of the Carlsbad pawn  structure seems far more interesting than the classical one in the QGD for Black. He managed to trade a pair of light pieces, plus White did not yet  start the usual minority attack on the queenside. 14. c3a4  14... b7b6  15. b2b4  15... a6a5 Sealing the queenside for the time being. 16. b4b5  16... g7g5 This is the other difference in comparison to the usual  Carlsbad. Black can use the pawns for the attack too. 17. a4b2  17... e7g6 