context: 1. g1f3 Historically Ding’s main move is 1.d4. In his first white game he went for 1.e4. Now he tries a third option. 1... d7d5  2. e2e3  2... g8f6  3. b2b3 Ding has never played this before. With this move he shows that he wants a position without much theory and without many risks for this game. 3... c8f5 Black has many development options: he can put the bishop on g4, play 3...e6 and then develop it with the fianchetto (b6-Bb7) or he can immediately develop the other bishop with 3...g6. The move played is also natural and good.