Position by position computer analysis of the Blackmar-Diemer Gambit is online at the Open Encyclopedia of Chess Openings (OECO) wiki (http://oeco.hopto.org/mediawiki/index.php/Main_Page):

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 or 1.d4 Nf6 2.f3 d5 3.e4 dxe4 4.Nc3 exf3

Blackmar-Diemer Gambit Accepted (5.Nxf3) http://oeco.hopto.org/mediawiki/index.php/Blackmar-Diemer_Gambit_Accepted

Blackmar-Diemer Gambit, Ryder Gambit (5.Qxf3) http://oeco.hopto.org/mediawiki/index.php/Blackmar-Diemer_Gambit,_Ryder_Gambit

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