Trompowski BDG-Like Gambit
There is a line in the Trompowski (1.d4 Nf6 2.Bg5) that is very similar to the BDG (Blackmar-Diemer Gambit). It occurs in the Ne4 lines, where White saves the bishop and then repels the Knight with f3, and then plays e4 for a BDG-like gambit.
Diagram: Trompowski BDG-like Gambit Line
The result is actually a tempo ahead of the main-line of the Blackmar-Diemer Gambit. This opening is barely known in theory and there is much room for experiment and analysis here.
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