1. g1f3  1... g8f6  2. c2c4  2... c7c5  3. b2b3 Carlsen is a player who can literally choose any opening variation. I believe it's the first time he plays this line. It takes great confidence and exceptional memory to do this, qualities he doesn’t lack. Among world champions, none can be compared to him in this versatility. Of elite players, only Ivanchuk manages a similar feat. 3... b8c6  4. c1b2  4... d7d5  5. c4d5  5... f6d5  6. b1c3  6... e7e5  7. d1b1 [%c_effect b1;square;b1;type;Interesting;persistent;true] A theoretical novelty already. This is a thematic move in positions with this pawn structure, and it's curious that it has never been played. This probably happened because nobody saw the need to look for such a move. 7... f8e7  8. e2e3  8... c8e6  9. f1b5  9... f7f6  10. e1g1 