▁announced ▁by ▁the ▁solo ist ▁ ▁Grand : ▁only ▁the ▁Jack s ▁or ▁Un ters ▁are ▁tr umps ▁ ▁Null : ▁contract ▁in ▁which ▁there ▁are ▁no ▁tr umps ▁and ▁the ▁solo ist ▁tries ▁to ▁avoid ▁winning ▁any ▁tr icks ▁ ▁Un o fficial ▁contract s ▁ ▁The ▁following ▁contract s ▁are ▁also ▁played , ▁but ▁are ▁not ▁recogn ised ▁by ▁the ▁Sk at ordnung : ▁ ▁Revolution : ▁uno fficial ▁contract ▁which ▁is ▁like ▁Null , ▁except ▁that ▁the ▁oppon ents ▁may ▁exchange ▁with ▁the ▁sk at ▁ ▁B ock : ▁uno fficial ▁contract ▁in ▁which ▁all ▁game ▁values ▁count ▁double ▁ ▁Ram sch : ▁uno fficial ▁contract ▁where ▁each ▁player ▁plays ▁for ▁himself ▁and ▁the ▁aim ▁is ▁to ▁score ▁the ▁few est ▁points ▁ ▁Sch ie ber am sch : ▁like ▁Ram sch , ▁but ▁the ▁sk at ▁may ▁be ▁picked ▁up ▁by ▁each ▁player ▁in ▁clock wise ▁order . ▁If ▁a ▁player ▁cho oses ▁to ▁pass ▁on ▁the ▁sk at , ▁the ▁los ers ▁usually ▁score ▁twice ▁as ▁many ▁minus ▁points . ▁After ▁pick ing ▁up ▁the ▁sk at ▁the ▁player ▁returns ▁two ▁cards ▁to ▁the ▁sk at , ▁which ▁may ▁be ▁picked ▁up ▁by ▁the ▁next ▁player ▁in ▁turn . ▁The ▁sk at ▁is ▁usually ▁' sh oved ' ▁once ▁per ▁player , ▁each ▁player ▁may ▁also ▁exchange ▁one ▁or ▁two ▁cards . ▁The ▁sh oving ▁of ▁Jack s / Un ters ▁after ▁pick ing ▁up ▁the ▁sk at ▁is ▁often ▁forb idden . ▁ ▁Game ▁value ▁ ▁Mult