At some point I added a simple backtracking algorithm to deal away with small instances, however it didn't influence the results that much. Probably I should test it again. I could use, for example, sat4j to solve small instances, but since probably sat4j is more efficient than STRUCTure the results will be biased.
Nevertheless switching to another algorithm doesn't fix the root problem which I can't understand yet. My guess is that lookahead solvers are not that good on easy instances with many variables that appear in relatively few clauses. What I want to do next is to add another simplification procedure to eliminate these variables like variable elimination in SatElite, but simpler and at every branching node.
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