Solution
1.Kb6 e5 2.Kxc6 e4 3. Ra3+
White must gain a tempo at this point, or bring the king to the 2nd rank. The idea is that if he doesn’t then: 3. Rh3?? e3 4. Kd5 e2 5. Rh2 Rd1+ and queens.
Kb2 4.Rg3!!
It will become obvious later why this move holds and not Rh3
4…e3 5. Kd5
If 5…e2 6.Ke4! Kc2 7. Ke3 and draws
5…Kc2 6.Ke4 Kd2 7. Rh3! If white didn’t have this move he would be lost
For example 7.Rg3 Rh1! 8.Rxe3 Rh4+ 0-1
7…e2 8 Rd3+ Kc2 9.Re3 draws.