1. g1f3  1... d7d5  2. e2e3  2... c7c5  3. b2b3 A very popular line in blitz. 3... b8c6  4. f1b5  4... c8d7  5. c1b2  5... e7e6  6. c2c4  6... g8e7  7. c4d5  7... e7d5  8. e1g1  8... a7a6  9. b5e2 [#] 9... f7f6 An  ambitious novelty. Caruana defends the pawn and wants to complete the  development in the most optimal way, putting the dark-squared bishop on  the b8-h2 diagonal. 10. d2d4 The most ambitious strike. So needs to build his initiative  while his opponent has has the king in the center.