Fast and lightweight SAT solver Despite the NP completeness of the satisfiability problem of Boolean formulas (SAT), SAT solvers are often able to decide this problem in a reasonable time frame. As all other NP complete problems are reducible to SAT, the solvers have become a general purpose tool for this class of problems. MiniSat is a minimalistic, open-source SAT solver, developed to help researchers and developers alike to get started on SAT. Winning all the industrial categories of the SAT 2005 competition, MiniSat is a good starting point both for future research in SAT, and for applications using SAT.