Due to popular request (no, really! I had a whole one!), here's my variant HW/HW-a-like die-rolling convention. As loved by d12 fetishists and mastery-step haters, and Mildly Admired by the Great Greg. ("You know, that has a certain charm. Shame they don't make d22's".)
Ability scale: target numbers run from 1 to 10. 10 is equivalent to a 20 in HW (if converting, simply half all TNs). Masteries are as per HW, thus we have 9, 10, 1W, etc, with bump-ups as before.
Die-rolling: when making a test, or contest resolution, roll a d12 against the TN of your ability. If you roll less than or equal to the TN, you score a success. If you score over the TN, up to a 10, you've failed.
Original bit:
If you roll an 11 ('natural!'), then you roll again, resolving it as per the above (and herein), and then raises your level of success by one: i.e., get a bump-up.
If you roll a 12 ('...boxcars...'), then you roll again, and bump _down_.
For compatibility with HW, top-out the bumps at crit and fumble. For open-ended hilarity, don't bother.
Cheers,
Alex.
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