ich rutsche auf meinem Stuhl hin und her
In the sentence above I think that there is some movement, so why doesn't it use accusative?
ich rutsche auf meinem Stuhl hin und her
In the sentence above I think that there is some movement, so why doesn't it use accusative?
There is no movement from elsewhere to the chair. The entire action you describe (moving/shifting forth and back) takes place at the same location (on the chair), hence dative is correct here.