Blackmar-Diemer Gambit

1.d4 d5

2.e4

1.d4 d5 2.e4 e6 3.Cc3

1.d4 d5 2.e4 c6 3.Cc3

1.d4 d5 2.e4 dxe4 3.Cc3

whereas Black Dieter Gambit arose as a development of the earlier Blackmar Gambit.