This pawn sacrifice turns out to be  dubious, to say the least.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... h7h6 Dubov's pet move with which he  won a few beautiful games last year (see below). 5. b1c3  5... f8b4  6. e1g1  6... b4c3  7. b2c3  7... e8g8  8. c4b3 Not a common continuation  but a logical move. The bishop steps back in anticipation of the imminent  central break d7-d5. 8... d7d5  9. e4d5  9... f6d5 