dzechiel: White to move. Material even. "Insane."
At first glance, it looked to me like black's knight on e2 was en prise. But some searching around the board revealed that black was threatening to capture the bishop on f7, as once white recaptured, the rook on g4 would then be hanging.
So, I expect we will need to look deeper, and come up with a plan.
One of the things I noticed early on about this position, is black's weakness on the a1-h8 diagonal. Because of this, I think the first move is most likely...
This move has two things going for it. First, it allows the queen to protect the rook on g4. The threat of 43 Rxe2 is now real, and black must counter it. But even more important, black cannot capture with 42...cxd5 because white could then play 43 Qd4+ Nxd4 44 Bxd4+ Bf6 45 Bxf6#. How can black put up resistence?
Well, I don't think the black knight is going anywhere, so I think black will have to come up with a threat of his own. Right now all I see is...
This move stops the mating combination starting with 43 Qd4+ mentioned above, and it threatens the rook on g4, so white doesn't have time to go after the knight.
Gosh, the more I look at this, the more I don't like 42...h5, mostly because of 43 Bd4+ Kh7. This isn't good for black, there must be something better for black's 42nd, but I'm not seeing it tonight.
OK, turning over all the cards. Time to check.
Wow. In retrospect, the capture on f7 is obvious, as it is forcing and limits white's replies. I should have looked at it harder.
Black's resources are only out-shined by white's resources. A very interesting ending.