@inproceedings{hurley_proteus:_2014,
  title = {Proteus: {A} {Hierarchical} {Portfolio} of {Solvers} and {Transformations}},
  abstract = {In recent years, portfolio approaches to solving SAT problems and CSPs have become increasingly common. There are also a number of different encodings for representing CSPs as SAT instances. In this paper, we leverage advances in both SAT and CSP solving to present a novel hierarchical portfolio-based approach to CSP solving, which we call Proteus, that does not rely purely on CSP solvers. Instead, it may decide that it is best to encode a CSP problem instance into SAT, selecting an appropriate encoding and a corresponding SAT solver. Our experimental evaluation uses an instance of Proteus that involved four CSP solvers, three SAT encodings, and six SAT solvers, evaluated on  the most challenging problem instances from the CSP solver competitions, involving global and intensional constraints. We demonstrate that significant performance improvements can be achieved by Proteus obtained by exploiting alternative view-point and solvers for combinatorial problem-solving.},
  booktitle = {{CPAIOR}},
  author = {Hurley, Barry and Kotthoff, Lars and Malitsky, Yuri and O'Sullivan, Barry},
  month = may,
  year = {2014},
  pages = {301--317},
  month_numeric = {5}
}