two archers are firing at each other: one has taken cover behind a stone column, the other a drape.
who is better off?
(pg 146)
cover: +4ac
partial concealment: 20% miss chance
- in a normal situation they are equivalent (4/20 = 20%)
- if the attacks overwhelm the ac (only missing on a 1) then the +4ac may not make a difference and 20% is better.
- if the ac overwhelms the attacks (only hitting on a 20) then 20% is much better since it can prevent criticals. this is also the case in normal situations.
in all situations you are better off with the concealment and its 20% miss chance.
these mechanics resulted from an extension of the 50% miss chance for invisibility (which it definitely deserves, a +10ac bonus just wouldn't cut it). understandable. but when you are in a fire fight and you're better off behind a sheet than a stone slab then game mechanics are breaking down.