White has a major advantage in development at this point. Nothing black can easily move. Nf6 e5; king's bishop needed to protect g7. b6 and then Bb7 looks doable.
6... Qd8f6 7. c3
A lot better than e4 but the queen side officers need join the game fast.
7... b6 8. b4 Bc8b7 9. Bc4b5
? The mate threat is appealing but the white queen is overburdened, letting black into the game.
9... Qf6xd4 10. cxd4 Bf8xb4
Bxe4 was better.
11. Bc1d2 Ra8c8
Bxb4 Rc1+ followed by Rxh1
12. O-O Bb4xd2 13. Nb1xd2 Ng8f6
Finally black has developed everything, except the king's rook and the threat Bxd7 can make that problematic.
14. Ra1c1 a6
Prepares to bring the remaining rook to play
15. Bb5c4
Better was Rxc8+ followed by Rc1, developing the white rook to an open file with a tempo move. Or Bd3, protecting the underdefended e-pawn.
15... b5 16. Bc4b3
Still Bd3
16... O-O
Brings the second rook to play and frees the bishop to join the attack on the e-pawn as it no longer needs defend the rook.
