Black to move. How should black proceed?
I could never have found this win, but I am not really convinced it is inhuman- it just takes a bit more imagination to see it as a possibility than even most professional chess players will have. I mean, even me, a wood-pusher, was looking at ways to get the black king to h8 to drive the white king out of the fortress.
I am working on a comment that outlines the method, but it is complex and it is taking me time to work out all the variations to my own satisfaction. In short, though for this comment, black wins with 1......Bh4. It isn't clear to me that this was the only point in this ending that black had to win- many of the subsequent positions have the same men on the board, but I am not sure if the win possibility existed in those as well- the on-line commentary seemed to indicate this was the only one.