Well there are a few problems with figuring that out. one, Alot of the descriptions of the bows don't accurately discribe their Thaco and damage correctly, some are confusing. Like the Elven court bow +3 says it has a Thaco bonus of +4, Some bows give Thaco bonuses, but don't say anything about damage.
How D&D worked is that if you have a +3 bow, its can hit monsters that can only be hit by +3 magical weapons, even if you use a normal arrow. If you have a bow+2 and shoot +1 arrows, then the total bonus is +3.
Baldur's Gate 2 seems a bit screwy in this method, kinda hard to figure out just what bows do what. If you have a +3 bow and shoot +2 arrows, they should be able to damage +5 creatues. (+3 and +2)
In the case of variable bonuses (+1 to hit, +3 damage or +4 to hit, +2 damage, the lowest number is suppose to be the one you use to determine what you can hit, thus a +4 to hit/+2 damage bow could not damage a monster that needs +3 to hit.
Of course, BG doesn't quite match up to what D&D was.
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