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1…Nf6 2…g6: g3 rather than g4
Against 1…Nf6 2.Bb2 g6, GMHess sets up d3, Nd2, e3, Ne2 and h3: 3.d3 comes up in 77 games, 62%. The same choice comes back after 5…d5 6.Ne2 c5 7.h3 Nc6: GMHess plays 8.g4 there in 49 games, and Stockfish again prefers 8.g3.
Recall: after 3…Nc6, which move does Stockfish prefer?