Another one from one of my favourite blogs, chessexpress Apparently it is another oldie, being originally composed by Behting in 1906.

Hope you enjoy this amazing display of chessboard magic.

wow! AMAZING!

Yes great end position that :)

That was a nice one. Could black have been able to pull out a win if he didn't promote the pawn right away?

Another great share! Thank you.

wow

If black delays promotion then this is what I have.  :)  What do we think?  :)

You are right I thought that I had included that line in the original puzzle, but glad that I didn't now, as it has encouraged some work and hopefully improvement for yourself