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Message: <blockquote data-quote="Staffan" data-source="post: 9718721" data-attributes="member: 907">It's not a decision-making mechanic. It's a simple way of dealing with opposed rolls and quality-of-success.If you start with a linear roll-under system, it's easy to at first assume that the lower your roll, the better you did. Succeeding by 10 is better than succeeding by 2. If we're fighting and I succeed by 8 and you by 3, I did better than you and therefore win that round of fighting and I get to deal damage to you.But that requires that we, for each roll where it matters, calculate a margin of success by taking our skill value and subtracting the actual roll. That's not rocket surgery, but it's still a step of arithmetic. If we instead just compare the rolls themselves (with any roll above your skill being a failure and thus not counting), the probabilities are identical but we don't have to do math. Win!You could also use it to determine quality for other rolls, but I've rarely seen that in the wild. For example, maybe a successful Survival check provides food for yourself + roll/4 others. Maybe picking a complicated lock requires that you accumulate total rolls of 50 to unlock with one roll made per round</blockquote>