Thac0 was brilliant and completely intuitive. Long live thac0!
LoL, NO. Lets just start with the absurdity of AC in the days of THAC0. So I equip a shield and that raises my AC? Nope. AC is an inverse, so the better yours is, the lower the number? Yep. So the best I can get is 0? Nope, we can go into negative numbers! Well I rolled a 14, does that hit? Ok, take the 14 and you were using a dagger +2 so add 2. Now we are at 16. Ok so did I hit? Well you were swinging at an invisible target so thats a -4. Ok so 12...did I hit. Well The orc was wearing armor of ridiculousness that gave him an AC of -3. So you started with a THAC0 of 12 which means a roll of 12 or higher is a hit. Ok so I hit because my modified roll was a 12, right? Well no because now we have to subtract the orc's delta from AC 0 from your THAC0 so 12 - a -3 and - - =+ so 12+3 = 15 so you need to roll a 15...you missed.
Yeah that system was AMAZING. One of the few things I DON'T miss about AD&D 2e.
