Is there an accepted refutation of the Blackmar-Diemer Gambit, 1. d4 d5 2. e4 or what is the strongest line for Black to prove that the gambit is unsound?

  • At the moment, Ziegler's defense is threatening to refute it. Alchemy Variation seems to "hold" the opening, but White really struggles. Seek out the current theory on Alchemy Variation -> if that line fails then BDG is refuted. To know how just seek out Ziegler's defense. – AlwaysLearningNewStuff Sep 21 '15 at 22:09

The simplest refutation is 2...e6, the french defense, one of the most stable openings for black. It is also fine to accept the gambit 2... dxe4, but you have to know some specific traps....

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    If (and only if) the French defense is a part of black's opening repertoire, then 2....e6 is indeed the easiest reply. But what if black doesn't want to play the French? – Maxwell86 Sep 20 '15 at 16:55
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    So 1...e6 is the refutation of 1.e4? – bof Sep 21 '15 at 9:51
  • In fact you are right. 1...e6 or 2..e6 is not a real refutation but a simple way to avoid Blackmar-Diemer Gambit. For many players it is simpler to know a simple and positional way to avoid this gambit tactics (which is typically much better known by the gambit player than by someone who is playing it for the first time....). And finallly in fact I know of no real strait forward refutation of this gambit. – Oliver Sick Sep 21 '15 at 15:24

Not an expert, but I'd say the onus is on the gambiteer (White) to prove anything. W is delaying development and must waste time to capture the pawn later. Black has natural moves like Nf6 and Bf5 which both develop and delay W's capture of the pawn (and can possibly even hold on to it). W is just giving away some of the opening advantage. I don't think Black can expect more than this. W can also choose to give up a pawn altogether with f3, exf3, Nxf3 with in-adequate compensation.

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