The Christmas Puzzle, Part Three.

As usual: no hints, no solution and no tricks.

Do try to solve yourself: no research and no engines, please.

Welcome to hell.

This is plain mean-spirited.

p.s. To save the planet a little, I've run a few engines over the puzzle for you:

Houdini doesn't get it @ depth 40:

Stockfish doesn't get it @ depth 50:

There's a concept at play, that evades engine comprehension.

What about Qb4? From what I see, this is a draw, since White has a perpetual, but there might be a line where White can win.

wow, that looks fierce

Take another look. The recently promoted Black Queen interposes on b4.

 i know...that's why i deleted that hasty posting.

this is unfairly tough!!
Anyone got Kramnik's or Nakamuras Number/ email ? 

what might the solution/idea be then for us mere mortals?

Once you know the general idea (I'm naughty, I looked it up and I'll get coal), then it's really easy.

Not takers then, by honest-to-goodness solvers?

Poor show Chess.com, poor show.

Against my better judgement, I'm going to spend time trying to solve this ... will report back when I've failed lol.

Ok, so, barring any strange first/second moves by black, we have:

And now there are far too many possibilities! Taking the pawn loses to Qc4+, the queens come off and Black wins easily. There is the idea of 6.Qb1+ threatening the pawn but after 6...Kc5, taking the pawn again loses to the Qc4+ idea.

So then I looked at king moves. 6.Kb2 is the only interesting try, threatening Qc3+ followed by mate. Two defences as far as I can see:

-If 6...Qa4 defending, there is a small forcing sequence 7.Qxe4+ Kb5 8.Qd5+ Kb4 and then I'm truly stuck.

- And anyway, 6...Qe5+ forces the king to b1 or c1 and then I can't see how to progress.

All in all I'm stuck.