This is what the American wanted to try, a relatively fresh  line.
1. c2c4  1... g8f6  2. g1f3  2... d7d6 Already a surprise. Caruana plays the KID very, very  rarely. 3. d2d4  3... g7g6  4. b1c3  4... f8g7  5. e2e4  5... e8g8  6. f1e2  6... e7e5  7. e1g1 