Can You Find The Shortest Mate

How quickly can you find the shortest mate from the position above? It took me almost half an hour.

8/7p/7R/1p2kp2/1R6/3K4/8/8 w - - 0 1

Comments
No. 1-3
olivier
olivier

R a6 ?

Yancey_Ward
Yancey_Ward

Editor

Alena, I left you an important message in one of the Zinar puzzles.

Alena
Alena

It took me 13 minutes.

1.Rbh4 Kd5
2.Rd4+ Kc5
3.Rf4 b4
4.Rxf5#

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