Puzzle of the Day 10 August 2021 |  Find the best move

1. b7 Rc2+ 2. Kxc2 g2 3. Nd2+ Ke3 4. b8=B Kf2 5. Ba7+ Kg3 6. Kd3 Kf4 7. Bg1 Ke5 8. Ne4 Kf5 9. Ke3