Doppelkopf (Double Sheepshead) was primarily played in the German-speaking areas of Europe. The German Doppelkopf Association (Deutsche Doppelkopf-Verband) was founded in 1982 in an attempt to unify and standardize the game in the face of this multiplicity of options. More and more Doppelkopf clubs are affiliating with the national association. For this reason, the official rules form the basis for this software. We also include the most popular variations for your enjoyment.