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To Hit AC 0:
Thac0 - AC = to hit roll
If your Thac0 is for example: 14, you need to roll 14 or higher on a d20 to hit your opponent with AC 0.
if your target has AC 5 then you need 14 - 5 = 9 so easier to hit.
if your target has AC -5 then you need 14 - - 5 = 19 so very difficult.
if you roll a 1 it's always a critical miss (fumble) and if you roll a 20 it's always a critical hit, even if you can't hit the creature (for example thac0 20, target AC -5 you need 25 or more, 20 still hits)
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