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'''THAC0''' (/ˈθækoʊ/, thack-oh) is an abbreviation for '''To Hit Armor Class Zero''' (0), and is used as the basis for determining if an attack roll succeeds in AD&D. To calculate if a hit succeeds, the player rolls a 20-sided die, and adds or subtracts any bonuses or penalties. The player then subtracts that number from their character's THAC0 value to find the strongest [[SRD:Armor Class|armor class]] (AC) the attack hits. In AD&D, armor classes range from 10 at the worst to -10 at the best, meaning a lower THAC0 value will yield better hits. A player can also subtract the opponent's AC (if known) from their character's THAC0 value to find the roll they will need to hit their opponent. ''Example:'' If the player's character has a THAC0 of 10, and they roll a 12 on the dice (with no bonuses), the best armor class they can hit is -2 (10 - 12 = -2). Put another way, if the same character wishes to hit an enemy with an AC of 4, they need to roll a 6 (10 - 4 = 6). The lower the THAC0, the lower the roll needed to hit any given AC value. Fighter classes have the best THAC0 progression and spell users have the worst. [[Category:term]]
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