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i missed the white pawn at h5 ;)
how bout B7 to B6..all sides covered. f6 can only go to f5 or i can be patient and let b4 be a queen

Actually it is true that 1. Rb6 should be enough to win in the long run.
However there is another (better) way to win really fast ... :)

If black delays the checkmate as long as possible, white needs 7 moves to win.

Sorry i couldn't do it nor my niece :)
we tried!

Well done! (I admit these chess problems are not so easy, but I hope you enjoyed it!)
Did you see the solution of the problem by @afrog yet? He is a very experienced chess player.

Oh let me see it! it almost gave me a headache ;)

Oh, OK, I will write it down in English as well!

  1. Rg7+ Kxh5. Now white has an amazing quiet move: 2. Kh3!, and black has no useful defense anymore against 3. g4.
    In alternative notation: 1. b7-g7+ g5xh5 2. g3-h3. Now white threatens to play 3. g2-g4 with checkmate. Black can only delay the checkmate by useless moves like 2. ... b3xf3+.
    I hope this explanation is good enough? If not, just ask again. :)

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