1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6  4. d2d3  4... f8c5  5. b5c6 Once again Caruana plays this variation which has become his specialty against the Berlin Defense. 5... d7c6  6. b1d2  6... f6d7  7. e1g1  7... a7a5 A rare move that has been played by So before.