The first surprise. This move is far from unheard of and has been played dozens of times, including a Magnus game, but it was not supposed to have the best reputation as of late. I have noticed that in the last couple years, Caruana has been more willing to play somewhat shakier looking lines with the Black pieces for practical value, and this game it nearly paid dividends.
1. e2e4 Round two of the Candidates was a quieter affair than round one, though there were some missed chances. The most notable game was between Nepo and Caruana, since they had jumped out to an early lead by winning the previous day. 1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... f8c5  5. e1g1  5... d7d6  6. c2c3  6... a7a6  7. a2a4  7... c5a7  8. f1e1  8... h7h6  9. b1d2 