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Differenzler Jass

This is a popular Swiss Jass game (see the general rules for Swiss Jass), in which the players must predict in advance how many points they will take in tricks. You get penalty points according to the difference between the number of points you take in the play and your predicted total. If you get it exactly right you can deduct 10 points from your penalty point total (except that there is no bonus for predicting and making zero). This version of Jass has become especially well known because it is featured in the weekly Samschtig Jass programme on Swiss television.

There is no score for Stöck or Weis. Match (all the tricks) counts as 157 points taken.

More complete rules will appear here eventually. Meanwhile here are some links to computer programs: