1. e2e4 Ding can play all three pawn moves (1.e4, 1.d4, and 1.c4), but opening with the king pawn was a bit of a surprise to me, as it's the one he plays the least. Furthermore, after his win with Black in the first game, one would expect him to avoid the sharp play resulting from a Sicilian defense, for example. But Gukesh decides to play solid, which is a good strategy after a loss.