Even more fun with Twitter!

Yes, another problem from Twitter. What can I tell you, I'm an addict.

As before, I haven't worked this one out yet. Also as before, this looks hard. What can I tell you, I'm also a masochist.

White to play and win (D.Przepiorka, early 1920s)... been puzzling over this for ages and still can't do it. pic.twitter.com/s4Lr4xDiZg

— John Saunders (@johnchess) April 12, 2016

7k/5p1p/8/7N/P1P5/8/K1R5/6Q1 w - - 0 1

Answer to follow as soon as either I figure it out or admit to abject defeat.