What is the general feeling about “roll under” as opposed to “roll over”?
For instance, in B/X a 5th-level fighter needs an 11 or better to hit an opponent in chain mail (AC5). That is 10 results out of a possible 20 on a d20.
What if the fighter’s player needs to roll a 10 or less on 1d20 instead of an 11 or more?
To-hit rolls and saving throws, among many things, are typically “roll HIGH to succeed.” But some other things, such as d00 percentile rolls and 1-in-6 listening checks, are “roll LOW to succeed.”
I don’t know how many games (other than d00-based games) use a roll low to hit system. Would anyone have a problem if all game mechanics in a fantasy RPG were changed to “lower is better”? Has there been any serious discussion of this somewhere?