Butterfly?

Please coul anyone discribe me the formation "butterfly"? Thanks.

http://i1361.photobucket.com/albums/...psf55f2c76.jpg

That's it :)

thanks!

Can you explain to me how it works / when it doesn't work? It looks just like a motivated 4-4-2 to me.
(sorry if I hijack your post, I'll be gone fast, I promise ;) )