context: 1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. f1e2  6... e7e5  7. d4b3  7... f8e7  8. d1d3 This idea was played several times during the match. It's a relatively uncommon move within the gigantic world that is the Sicilian Najdorf. 8... c8e6  9. c3d5  9... e8g8 Black waits before capturing the knight. 10. a2a4 I only found one game with this move. 10... b8d7 A new move. 11. c2c4 White's idea with a4 and c4 is to discourage the typical b7-b5 pawn break, although it's still possible. 11... a6a5 A difficult decision.