Boolean Advantage & Disadvantage
The advantage and disadvantage rule was introduced in Dungeons & Dragons, Fifth Edition . It is explained as follows: when you have advantage, roll two dice and take the higher of the two; when you have disadvantage, roll two dice and take the lower of the two. The rule abstracts certain factors of character ability tests that prior (in Third Edition ) would have been handled by adding or subtracting minute value from the roll. Instead the dungeon master need only decide if a character is advantaged or disadvantaged to such a degree that the roll warrants the appropriate procedure. In this post, I want to offer a new view on how this mechanic impacts chances of success by looking at it in terms of boolean (binary) logic and probability. This has implications for how we combine rolls in general, whether we view overall success as lacking failure (disadvantage) or overall failure as lacking success (advantage). Still no working computer. :c The Rules Part An ability test or check