1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... e7e5 Yep. If you cannot  beat it, use it. This might have been Caruana's thought when chosing  Carlsen's own weapon from their London match. 6. d4b5  6... d7d6  7. c3d5  7... f6d5  8. e4d5  8... c6b8  9. a2a4  9... f8e7  10. c1d2 A tricky novelty according to  Nepomniachtchi. If Black plays well he will end up with a normal  theoretical position, but otherwise he may land in trouble.