Put another way, how does "Base - M or 6, whichever is lower" apply to those specific numbers? Does "Base - M" actually mean "give the PC a mastery" as Dave Dunham suggested? In which case, what is the PC rolling against? Or is it an actual subtraction of 20? That would give a resistance of -6, which is certainly lower than 6--but -6 makes no sense in the game sense.
Sorry to be dense about this, but I'm not grokking the rule. I think I need to see it step-by-step for both a resistance between 14 and 20 and a resistance of 1M or greater.
Best,
Rob
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