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THACO= to hit armor class zero.... a good explanation would be thus. Say you run across a meanacing kobold with a armor class of 4, while your THACO rating was 7 that would mean that to hit the kobold you must roll a 3 or greater 7-4=3 (THACO-Target AC= minimum value to hit.) So, this pretty much determines your chances to hit a target. This will always hold true except for 1, which always misses, and 20 which always hits. BE aware, that there are many items and skills/proficiencies/situations which modify THACO, so refering to the example above with a +3 THACO sword you would subtract 3 from your THACO giving you a 4 (7-3=4) and against ac of 4 you would always hit except on a 1 (4-4=0)
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