final SolverIDDFS solverGeneric = (SolverIDDFS)Solver.createInstance(board);
final List<Solution> solutionsGeneric = solverGeneric.execute();
KeyDepthMapFactory.setDefaultClass(KeyDepthMapTrieSpecial.class);
final SolverIDDFS solverSpecial = (SolverIDDFS)Solver.createInstance(board);
final List<Solution> solutionsSpecial = solverSpecial.execute();
sb.append(solutionsGeneric.size()).append('\t');
sb.append(solutionsGeneric.get(0).size()).append('\t');
sb.append(solverGeneric.getSolutionMilliSeconds()).append('\t');
sb.append(solverSpecial.getSolutionMilliSeconds()).append('\t');