Human Pass

• 14 of 17 problems solved by expert pruning of the background knowledge
  (could probably be automated for large sets of problems)
• 3 problems could not be solved
  • A background axiom was omitted by the MPTP translation
  • Probably countersatisfiable (not confirmed yet)
  • All from one challenge problem
  • Easily solved after addition of the missing background axiom

• Final result:
  • 251 challenge problems verified
  • 1 challenge problem probably countersatisfiable
    (verified after adding the missing background axiom)
  • Found a rare case of incompleteness of the MPTP translation algorithm