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Is it roll under as in a percentage chance to succeed or roll low as in THAC0/descending AC?
Generally speaking, your skill (or other game value) is a number you want to have high, and then you want to roll low on the dice to get below the skill value.

A possible twist is "Pendragon"-style rolls (I've also seen them called Blackjack rolls) where you want to roll below your skill, but otherwise as high as possible. This is usually used for opposed rolls and sometimes for other rolls where quality of success is important. It works best with linear randomizers (single die), with bell curve randomizers it usually feels better to use margin of success.
 

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Generally speaking, your skill (or other game value) is a number you want to have high, and then you want to roll low on the dice to get below the skill value.

A possible twist is "Pendragon"-style rolls (I've also seen them called Blackjack rolls) where you want to roll below your skill, but otherwise as high as possible. This is usually used for opposed rolls and sometimes for other rolls where quality of success is important. It works best with linear randomizers (single die), with bell curve randomizers it usually feels better to use margin of success.

Okay, to me percentile dice / rolling low for skills makes intuitive sense - if I have a 70% chance to succeed, I have to roll 70 or lower. I can get where sometimes it can trip people up if they're coming off another game where you need to roll high to hit something, but it's not an enormous shift, IMO -- to me that's part of the fun of learning a new game. We recently started playing Mothership and outside of a few questions, it's been a breeze coming off of a Dungeon World game we last played.
 



Is it roll under as in a percentage chance to succeed or roll low as in THAC0/descending AC?
And yet, Call of Cthulhu is one of the most popular RPGs to this day. It's a D&D thing, it formats the brain a certain way, and it needs to be deprogrammed.

If your GM tells you you have a 50% chance of success, and you think rolling 51-100% is a success, clearly you understand nothing about probabilities. :p
Roll 2d6 8+ since '77

A 2 or snake eyes is an unlucky roll generally
 





Are y'all talking about those Are Pea Geez?

nerds GIF


Anyway, there's a real thread on the topic: Why do many people prefer roll-high to roll-under?
 

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