I have been puzzled for some time as to how slings and bows are determined to have an effect, or not have an effect, on certain creatures. If, for example, a creature can only be hit by +3 or higher weapons. Does that mean that a bow at +2 and an arrow at +1 will work, or does it mean that the bow must be +3, for it to work?
I ask this because if you look at arrows and bullets, they do have a THAC0 that matches their + factor. This in turn is added to a characters THAC0 which is then used in combat to determine the outcome. If the + factor of the bow is the only thing used, isn't that cheating a little bit. After all, you do need an arrow to shoot, otherwise it's useless.
As i said, i am puzzled.