Black usually chases the white bishop immediately with
1. d2d4  1... g8f6  2. g1f3  2... g7g6  3. c2c4  3... f8g7  4. b1c3  4... e8g8  5. c1g5 This move is a specialty of GMs Mamedyarov and Dubov, who often use it in blitz games. 5... c7c5  6. d4d5  6... d7d6  7. e2e3 There's nothing wrong with advancing the pawn two squares.