Wow your opponent is rated 1700?
Glory Post

I'm not trying to trash on the guy. I've made bad moves before as well. I just never had a chance to use this particular trap before and I'm glad I finally saw it in action. For those who haven't seen it, I hope you learn this trap well. Whereas you will probably not get to use the "trap" per se, it illustrates a common mating motif.

It is actually called Legal's mate and was featured in Legal-Saint Brie, Paris 1750.
Reference: http://www.spiritus-temporis.com/checkmate/quick-checkmates-in-the-opening.html
First time I got to use this trap...