1. g1f3  1... d7d5  2. d2d4  2... g8f6  3. c2c4  3... e7e6  4. b1c3  4... f8e7  5. c4d5  5... e6d5  6. c1f4  6... c7c6  7. d1c2  7... g7g6  Probably Black's most important idea in the Carlsbad: getting rid of the  weak light-squared bishop. 8. e2e3  8... c8f5  9. f1d3  9... f5d3  10. c2d3 