Okay, new version is up and should be slightly cleaner and more functional across d100 systems both old and new.
Hi Kumada,
You would probably be fine with an even shorter statement that covers the bases:
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"Standard difficulty on all tests is DR 12. If a test would be at “half skill” it’s DR 15. At “fifth skill” it’s DR 18. If a PC is opposed by an NPC, only the PC rolls. NPCs with skill levels imposing half and fifth skill rolls on PCs use DR 15 and DR 18, respectively."
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Cheers,
Brian C.