how to prevent back rank mates?


Urg sorry guys the formatting is really ugly. I'm on a mobile phone now. Is there a way to pretty this post up using the mobile client?

I figured out how to get the link to your puzzle.
The problem with moving a pawn forward is that although it does save the king, Black plays Re1+ anyway, winning the bishop and paralyzing the knight. Kf1! stops the rook from going there.