All these moves are obvious and logical, as well as Dubov's next novelty.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. c2c3  4... g8f6  5. d2d4  5... e5d4  6. b2b4 A very rare  move. And a top guess by Dubov as we shall witness! 6... c5b6  7. e4e5  7... f6e4  8. c4d5  8... e4c3  9. b1c3 