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The Diemer-Duhm Gambit is a variation of the French Defense and is characterized by the moves[1][2][3]
The Diemer-Duhm Gambit is also a variation of the Blackmar-Diemer Gambit declined with the move order 1.d4 d5 2.e4 e6 3.c4.
The opening is named after the German master Emil Josef Diemer and the German-Swiss master Andreas Duhm.