Puzzle of the Day 21 March 2018 |  Find the best move

1. Rg6 Ke7 2. Kb7 Kf7 3. Rg4 Kf6 4. Rxf4+ Kg5 5. Rd4 g2 6. Rd1 Kf4 7. Kc7 Ke3 8. Kd6 Kf2 9. Rd2+ Kf1