advanced puzzle

Unless you've seen this before, its a tough one I think.  I just made it up, but its useful in endings.

Don't forget to click the movelist.  There are some variations in there that you may want answered.

haha sorry to wreck your puzzle, but on move 5 if white played Kd3 instead of Qf1+? then black would have to play a1=N to prevent mate, and white could then play Kc3 and all black can do is stall a move with Nc2 Qxc2+ Ka1 Qb2 mate.

I think best is 1. Kd3, which puts white's king in the mating square after queening his pawn a move before black, white can use the usual queen manuever to set up a mating net a little bit easier than in the puzzle.

Oh, and 14. Qa4 is mate also.