1. e2e4  1... e7e5 A bold decision. In general, the Petroff is a very safe opening and the best choice Black has to try to keep solid and hopefully make a draw. Still, I might have chosen something else. Caruana played the Petroff himself some years back, at the 2018 World Chess Championship and had that level of preparation. Nepo did this too, of course, but I think Caruana did it better, and his Petroff has looked like the better prepared and better understood one over the years. Against any other opponent, I'd think the Petroff would be an obvious choice. Here, I don't know. 2. g1f3  2... g8f6  3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. d2d4  5... d6d5  6. f1d3 