1. e2e4  1... e7e5  2. g1f3  2... g8f6 Caruana played the Petroff in several games during the match. This is one of the most reliable defenses for Black and it's no wonder that many elite players are happy playing it. 3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. b1c3 This line has a good reputation. Caruana has great experience in it, having played this position with both White and Black, including a game in the World Championship match against Carlsen. 5... e4c3  6. d2c3  6... f8e7  7. f1d3  7... e8g8  8. e1g1  8... b8d7  9. f1e1  9... d7c5  10. c1f4 If it had been a game at normal time control, Erigaisi would probably have moved the d3-bishop to avoid the exchange. In a bullet game, this is just a minor detail. Or is it not $2 As we will see, the pair of bishops was crucial to Caruana's victory. 10... c5d3  11. d1d3  11... f8e8  12. h2h3  12... h7h6  13. e1e2  13... e7f6  14. a1e1  14... e8e2  15. e1e2  15... c8d7 The position is objectively equal, although it's usually better to be the one with the bishops. 16. f3d2 Trying to activate the knight. 16... d8f8 A nice move, preparing to bring the rook to e8.