1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... c7c5  5. g1e2  5... d7d5  6. a2a3  6... b4a5 A fashionable move in the Nimzo-Indian Defense. Historically 6...Bxc3 is more popular. 7. d4c5  7... d5c4  8. c1d2  8... b8d7  9. e2g3  9... b7b6 [%c_effect b6;square;b6;type;Mistake;persistent;true] This move is a theoretical novelty. Far from being preparation, the move is probably the result of So confusing his analysis. 10. d1f3 [%c_effect f3;square;f3;type;GreatFind;persistent;true] Played after long deliberation, this is the most accurate reaction. 10... a8b8 So also took a long time to play this move. He probably realized something went wrong. 11. c5c6 