I was fascinated by this postion when it arose.  Playing black, I ended up promoting to win. I think it's equal, but my opponenet was vehement when saying that I had the advantage.  Black to move. Is it actually equal?

Which way is the board facing?  If the black c-pawn is on the 7th rank and about to queen it's a won game for you.   If it's on the second rank, black's 4 connected pawns vs. white's 2 isolated pawns should still be a decisive advantage I'd say.

Sorry for not mentioning it. Black's C pawn is on the second rank. Given the position, I don't see how black can convert those advantages. Is there a winnig variation for black?

Maybe transfering the knight to f3 and playing e5 as a sacrifice to create a passed d-pawn might win!?

Thanks Shakaali!

I don't understand your variation ending in 4...Kf8 -- white can just shuffle the bishop and ask what next.

Although at first glance I thought black should have a win somehow, just have to find the right moves -- but actually moving pieces I just don't see how black can make progress.

I must admit that I was quite vague with that variation and mainly because I didn't analyze everything. I mainly posted to propose a possible winning idea for further analysis. You actually seem to come up with a good idea in 6... Nd2 but instead of 7... Nc4+ I would go Ne4+ which looks winning or am I missing something? I would expect that black should alwayss be able to organize some kind of zugzwang but again folks please be critical with my hasty analysis.

7...Ne4 looks good to me :)  seems like a win anyway.  Of course at least change white's 6th move so not instantly dropping a pawn, but seems like black king gets out now anyway. 

Not only is white two pawns down, but it's a knight vs bishop + bishop has pawns on same color + white's pawns are far advanced... if white really can draw it would be a pretty cool position for going against so many rules of thumb.

I have to agree that it loks winning, although there are so many choices at each point that it becomes mind blowing: If 3.Kd6 then 3...Nf3 4.Kc6 Nd2 5.Be7 f5 looks like a good try for Black. Or 3.Kd7 Nf3 4.Ke7 e5! This is really interesting, isn't it?