Come on, guys! It's really not that hard.
Checkmate Challenge: The Mighty Knight
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Solved!
Nice!
Very interesting. My solution involved King moves, but yours revealed an even quicker way to do it:
The trophy is sent! I would have given you the Knight trophy, but it seems that you can only do that after playing a game. 
Here's a challenge for you all:
Show how a game of chess can be won on only the 6th (2-ply) move without the winning player moving any of his pawns.
The first person to post such a legal game will get a trophy.
Here's a couple hints:
Good luck!