Puzzle of the Day 27 December 2019 |  Find the best move

1. Rc3 e2 2. Rc7+ Kg8 3. Kg6 Kf8 4. Kf6 Ke8 5. Rxc2 e1=Q 6. Ke6 Kd8 7. Rg2 e4 8. Rg8+ Kc7 9. Rg7+ Kb8 10. Rg8+ Kb7 11. Rg7+ Ka8 12. Rg8+ Ka7