1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. f2f3 "A sharp line that is also very risky for White. I have never played this before." (Caruana) 4... d7d5  5. a2a3  5... b4e7  6. e2e4  6... d5e4  7. f3e4  7... c7c5  8. d4d5  8... e6d5  9. e4d5  9... e8g8  10. f1e2  10... f8e8 