This variation has become a very hot trend as of late, and I have no idea why. Vidit has lost this position three times with the black pieces, but he always seemed better out of the opening in all three games $1 In more recent times, it seems like the variation is one you choose when you want to lose with White to a lower-rated player, and badly—the So-Sevian game comes to mind as well. According to my understanding of chess, it cannot be right to go for a Carlsbad structure with the c1-bishop looked inside the pawn chain.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... e8g8  5. f1d3  5... d7d5  6. c4d5  6... e6d5 