Puzzle of the Day 12 March 2018 |  Find the best move

1. Rc5 Nb6 2. Kd4 Nc8 3. Kc4 Na7 4. Kb4 Kc8 5. Rc4 Kb7 6. Rc3 Nc8 7. Rc5 Kb6 8. Rc3 Ka6