Ah, THAC0. To Hit Armor Class Zero. I miss AD&D 2nd ed. sometimes. Then, I smack myself for thinking it.
As an unarmored average human, your Armor Class would be 10. In the old days, everything was backward. Lowering your AC was better, because your AC was subtracted from your attacker's THAC0. So, with a THACO of 20, hitting an unarmored average human, you need a (20-10=10) 10 or higher on a d20 roll to hit.
That's how it worked. Nowadays, higher numbers are always better.
Anyone remember when your "shitty" d20 that always seemed to roll ones was used for every saving throw you ever made?
Yeah, I played with Gary Gygax at Gen Con a few times. He was a great DM, more worried about making sure every had a good time than sticking directly to the rules.
"Hey Gary, how did 3 white dragons fit in that chimney?"
"They just did. Made for a great scene, didn't it?"
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Don't mind me. I'm just releasing the insanity pressure from my headvalves.
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