The sequential SAT solver RISS combines the Minisat-style solving engine of GLUCOSE 2.2. with state-of-the-art preprocessor COPROCESSOR and adds many modifications to the search process. RISS allows to use inprocessing based on COPROCESSOR. Based on this RISS, we create a parallel portfolio solver PRISS, which allows clause sharing among the incarnations, as well as sharing information about equivalent literals.