comment: A move that Carlsen had already tested in the 2010 World Blitz Championship.
context: 1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. e1g1  5... f8e7  6. d2d3  6... b7b5  7. a4b3  7... d7d6  8. a2a4  8... c8d7 This is Ding's favorite move in this important position for Ruy Lopez opening theory.