1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6  4. d2d3  4... f8c5  5. b5c6 Caruana is a great specialist in this system against the Berlin Defense. It leads to positions of a slow and positional character. 5... d7c6  6. e1g1  6... f6d7 