"The Blackmar–Diemer Gambit (or BDG) is a chess opening characterized by the moves: 1.d4 d5 2.e4 de4 3.Nc3 where White intends to follow up with f2–f3, usually on the fourth move. White obtains a move and a half-open f-file in return for a pawn, and as with most gambits, White aims to achieve rapid development and active posting of his pieces in order to rapidly build up an attack at the cost of the gambit pawn. It is one of the very few gambits available to White after 1.d4.
The Blackmar–Diemer Gambit arose as a development of the earlier Blackmar Gambit, named after Armand Blackmar, a relatively little-known New Orleans player of the late 19th century who popularized its characteristic moves (1.d4 d5 2.e4 dxe4 3.f3) and was the first player to publish analysis on the opening in the chess literature." For more info go to the source for this quoted material:
http://en.wikipedia.org/wiki/Blackmar%E2%80%93Diemer_Gambit
Armand Blackmar is pictured above (? doubtful, why is he wearing a Major Generals uniform since he was never in the CSA - NR),for more biographical data see this SOURCE: http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=83759431
GAME SOURCE: Modern Chess Miniatures ©1960 by IM Barden and Wolfgang Heidenfeld, pp 88-9. Unattributed analysis/commentary is from this source.
ADDITIONAL ANALYSIS: MCO -15, ©2008 by GM Nick de Firmian pp 513-4