The  pawn structure now is very much like the one in the Yates variation of the Ruy Lopez. White has a strong center, but Black's free piece play allows  him a chance to eventually attack and destroy the center.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. c2c3  4... g8f6  5. d2d4 The good old classical  line that So already used to beat the world champion earlier this year. 5... e5d4  6. e4e5  6... d7d5  7. c4b5  7... f6e4  8. c3d4  8... c5b6  9. b1c3  9... e8g8  10. c1e3 