This variation with the double fianchetto is original and risky, as it gives away the center to White. Bortnik is an expert in this line, also played recently by Carlsen in an important game.
1. d2d4  1... g8f6  2. g1f3  2... b7b6  3. g2g3  3... c8b7  4. f1g2  4... g7g6  5. e1g1  5... f8g7  6. c2c4 