I reckon you're right about Mongoose; I'm feeling grumpy but trying not to.
There is the possibility of not using opposed rolls. I usually do a pass/fail, then a second roll on a fail. If a thief succeeds on a stealth roll, fine, if he fails then give the guard a perception roll to percieve the mistake. The stealth roll can be modified according to circumstances...a rainy night, twigs littering the floor/ground, a clear moonlit night, an arranged distraction by the thiefs' buddies, etc. It works just fine. I like rules that keep the action going, these opposed rolls are like speed bumps.
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