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. 8. d2c4  8... d8e7  9. c1e3  9... f7f6  10. d1d2 A natural move that is new. 10... b7b6  11. a2a3 [%c_effect a3;square;a3;type;GreatFind;persistent;true] Starting the pawn advance plan on the queenside. 11... e7f7 