A Difficult Challenge

This is a 1st Prize winning puzzle from 2010. Can you find white's winning line? This is a difficult puzzle.

8/3b2KP/8/2R5/8/5R2/pk6/7r w - - 0 1

Comments
No. 1-5
CraigB
CraigB

After Alena's 5 moves it seems like 6. Ka7+ leads to winning the B quickly, e.g.

Yancey_Ward
Yancey_Ward

Editor

Then you need to figure out how to do that before black can get the pieces coordinated with the king. This is actually heart of the puzzle.

Alena
Alena

I think white must give checks to the king to win one of the black pieces eventually.

Yancey_Ward
Yancey_Ward

Editor

Alena, what do you think the minimum white has to do in that particular position after move 5 to get a winning position?

Alena
Alena

1.Ra5 a1=Q
2.Rf2+ Kb1+
3.Rxa1+ Kxa1
4.Rf1+ Rxf1
5.h8=Q Be6

It was easy for me to find five moves. Unfortunately I don't know queen vs rook and bishop endings at all. I opened 'Fundamental chess endings'and I couldn't find any information there either.

Yancey, could you tell me where I could find some useful information about the ending, please? I would like to understand it.

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