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THAC0 = To Hit Armor Class Zero
It is a factor that in the D&D and AD&D system (which the Baldur's Gate series uses) helps define your ability to hit an opponent. It is the number that you, an NPC, or an opponent needs to attack an Armor Class zero target successfully. Your THAC0 depends on your class, level, and improves as you attain higher levels.
Basically, whenever you attack in BG2, the game calculates a number based on your THAC0 and your target's armor class, and then generates a number from 1-20. Your target's AC is subtracted from your THAC0 and this number becomes the "to hit" number. If the number generated is equal to, or greater than your "to hit" number, your attack succeeds; if not, it fails. Generally speaking, the lower your THAC0, the better.
Quick example (taken from the manual):
A 3rd-level fighter with a THAC0 of 18 attacks a hobgoblin with an AC of 5. The hobgoblin's AC is subtracted from the fighter's THAC0, resulting in a "to hit" number of 13. In order for that fighter to successfully attack the hobgoblin, the number generated by the game for that attack would have to equal 13 or higher.
Hope that helps. =)
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Erydian<br /> 
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