Ive had real trouble with that opening against master Ive played in my local chess club. They have told me it is unsound.
Blackmar-Diemer gambit
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i've always liked this gambit myself, but i can see how people would say it's unsound. At the end of the day, i would look at one factor: if you understand the gambit and how to attack with, play it.
I've played a few BDG blitz games online and won quickly, but it probably isn't sound in OTB play. Maybe against a much weaker player...but not as your main opening.
Good game, especially Nxf7
Nov 13, 2010
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#5
I used to play the Blackmar-Diemer from time as time, as a surprise transposition out of the Scandinavian defense (1.e4 d5 2.d4?!). I would have thought people playing the Scandinavian in a tournament would have a response prepared for the BDG, but you should've seen some of their faces. 
I'd agree with most everything the previous posters have said. No, it's not really sound; probably even less so than other borderline gambits (Morra Gambit, Latvian Gambit, etc.). Yes, you might catch some people unaware OTB or in blitz because it's an unconventional opening. Yes, it's useful to play gambits from time to time to be forced into a mode where you have to make the most of every tempo. No, I wouldn't suggest using it as the basis of your "serious" repertoire.
Hi, I would like to know if the Blackmar-Diemer gambit is a good opening choice. Today I played a nice 5 minute attacking game at chess.com. The game is below. What do you think about the opening and its potential?