Recently I came across this position. I could not solve it. It baffled me and I fed it to Houdini Chess engine. For 15 minutes it showed only draw. And SUDDENLY, White wins!!!
I really do not know who owns this problem. I am only posting this just to share the joy with you. I shall give the solution only after 15 days. To enjoy, do not solve this with a computer.

i knew this, white has mate in 21, i saw this in one of my chess endgame books i got from public library.
Too bad i don't have the book with me now, but the author's comment was (from my memory): White toys Black with forceful moves, even forcing him to queen the pawns.
Spoiler: don't read if you are still trying, here is the actual solution.
If snrao thinks i should not post this here, i will delete this as soon as i see he says that.

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Please tell me how to hide the key.
Houdini, the monster of chess engines, gives 10.Kd3+ (instead of 10.Ke2+) mate in 19 moves with no fireworks like Queening & Bishop sac.
Players, especially children should not jump to the key without working hard for it. It will neither improve their chess nor bring them any joy. But nowadays everybody has a computer and let us leave it to their choice. Please keep the key.

you type in [hide ] and follow by [/hide ] (without the spaces in them)

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<edited by kamus to hide the key from anyone who inadvertently scrolled down>

Amazing. Deep Rybka 4 took 20 minutes as well as FireBird