Avoiding 6...e5 7.dxe5. The old classical reply  against the Classical line had a boost of interest in the past few years.
1. d2d4  1... g8f6  2. g1f3  2... g7g6  3. c2c4  3... f8g7  4. b1c3  4... e8g8  5. e2e4  5... d7d6 When in for a must-win, KID it is! 6. f1e2 