Here is a fun little puzzle that popped up in one of my recent games. It may be easy for some of you but it may be devastatingly hard for other . 

It's a mate in 6 by the way.

There are a lot of variations.

I think that this was the fastest mate...could you post a different variation?

1. Nf3+ Kh8 2. Rxh2#

Yes I already wrote that one on the puzzle.

Nice puzzle!

Thanks a lot. 

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I still don't see any other variations that mate...It would be nice if you actually looked before posting a comment and it would be even nicer if you posted at least 1 of the "lots of variations".

Qh4/Qh5/Qh6

Well, I personally found this devastatingly hard (as you said it might be). On move 3, I kept trying Qh5 and Qh6, but they're both "incorrect." Then on move 4, I carelessly played Qxh7, which was clearly "incorrect" as well. Finally, the last move proved very tricky indeed. I was sure I had it when I played 6...Qh1#, only to be wrong once more. After reconsidering for some time, I triumphantly played Rg7#. Unfortunately, there was still some subtlety I must have been missing, because this wasn't right, either. I then got stuck for quite a while, but eventually (after some lengthy analysis) I hit upon the unique solution: 6...Qh2#!!

Problem solved! (at no small cost to my sanity)

Variation:

1, ...Rxh2 2. Kxh2, Ng4+ 3. Kh1 or g1, Qh5 4. Whatever, Qh2#

This, like 1. Nf3+ Kh8 2. Rxh2# variation, relies on your opponent making a crappy move and retreating the King back into his hole instead of pursuing the Knight, which also leads to mate, just not as fast.

Great,  a very fun puzzle.

I think that some people ( obviously people who don't spend a lot of time calculating moves ) might play Kh1 because they though that gxf3 would weaken there king too much ( they were right there  ) so instead they played Kh1 without seeing the threat of Rxh2#

Qxh7 works as well.

Here are the variations people have mentioned.

Are there any other mating variations?

There is a perpetual check variation.

Nice 

I'm still looking for another way to find mate...