Halosar trap

I have seen a lot of posts on this trap, but since this is a blog, I thought the more the merrier.

This is the best known trap in the BDG -- Blackmar-Diemer Gambit -- and it is called the Halosar trap.  If you play against an under-experienced opponent in blitz games, this can be real helpful, but in a standard game with correct play from Black,White will be at a disadvantage.