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Diemer-duhm Gambit The Diemer-Duhm Gambit (DDG) is a chess opening that begins either with The name of the opening comes from the German master Emil Joseph Diemer, father of Blackmar-Diemer Gambit. No books have been written about the DDG, but games, analysis and articles are found on the . In short, the DDG is a dubious opening, but fun to play.
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