Puzzle

Devilish... white to mate in 1! Obviously not with the Rook as NxR fails... Fundamentals first!

Now if you're stuck, follow the link for the answer. You'll have to scroll down about 2/3 of the page:

http://www.google.co.uk/imgres?imgurl=http://2.bp.blogspot.com/_SqhhJb_P3Kk/Sm5K7XiAg0I/AAAAAAAAIQc/Ysum0mIlgQ0/s400/fiendish%2Bchess%2Bpuzzle.png&imgrefurl=http://tywkiwdbi.blogspot.com/2009_07_01_archive.html&usg=__qvh2osiWm5ro2WlLGvwRpi4H8ts=&h=373&w=372&sz=16&hl=en&start=185&um=1&itbs=1&tbnid=WWmKIxdFVJyRkM:&tbnh=122&tbnw=122&prev=/images%3Fq%3Dguiness%2Bchess%2Bset%26start%3D180%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1T4GGIE_enGB341GB341%26ndsp%3D18%26tbs%3Disch:1