1. c2c4  1... g8f6  2. b1c3  2... c7c5  3. g1f3  3... e7e6  4. e2e3  4... d7d5  5. d2d4  5... a7a6 This is a popular move to keep the central tension and avoid a possible development of White's bishop on b5. 6. c4d5  6... e6d5  7. f1d3 This is only the fourth-most-played move. The bishop normally goes to e2 or even g2 after 7.g3. Capturing on c5 is also a popular choice. 7... b8c6  8. e1g1 Why is bishop development on d3 not so popular $2 Mainly for two reasons: Black can now play c5-c4 and attack the bishop, or else play the Bg4 with an unpleasant pin. 8... c8g4  9. d3e2 Modern times. White plays Bd3 and returns with the bishop to e2 soon. What's the logic of that $2 Caruana's idea will soon become clear. 9... a8c8  10. f3e5 A new move, again trying to exploit the bishop on g4. 10... g4e6 