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Let's Talk About THAC0
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<blockquote data-quote="Beleriphon" data-source="post: 7617403" data-attributes="member: 27847"><p>On French, THAC0 is an acryonym of To-Hit Armour Class 0; so I'd go with whatever gendered pronoun you'd use for Armour Class in French.</p><p></p><p>As for the math, its very clearly: (Die roll + Modifiers) - THAC0 score = AC Hit</p><p></p><p>Thus, a roll of (13 + 2 for a magic weapon) - THAC0 18 = 3, so we hit AC of 3.</p><p></p><p>The issue is that in the AD&D rules at any point actually explain the process of attacking in that way. So the process isn't hard at all, its not really that much harder than d20 roll + BAB + Mods = AC. The difference is that the rules in 3E explain this all very clearly in the rules dealing with attacks.</p><p></p><p>The other big difference is that AD&D had a bunch of disparate subsystems that didn't really add up the same since some were roll under with modifiers to die rolls, others were roll over with modifiers to die rolls, some were roll under with modifiers to target numbers.</p><p></p><p>On the last one look at saving throws. A bonus from some kind of item was say +2 to Save vs Wands. That's actually a bonus to the score, so if your character had a score of 16in that save category, while wearing the magic item it became 18, which only fails on a 19 or 20, rather than a 17 through 20.</p><p></p><p>The biggest change 3E did was consolidate the way rolls were made to begin with. THAC0 is easy enough, but there is no reason it should be a completely different set of math for task resolution from every other task resolution in the game. So it should either all work like THAC0, or should all work like something else, but having a dozen different methods to calculate success from rolling a d20 is why THAC0 has a bad reputation, its the poster child for mismatched task resolutions.</p></blockquote><p></p>
[QUOTE="Beleriphon, post: 7617403, member: 27847"] On French, THAC0 is an acryonym of To-Hit Armour Class 0; so I'd go with whatever gendered pronoun you'd use for Armour Class in French. As for the math, its very clearly: (Die roll + Modifiers) - THAC0 score = AC Hit Thus, a roll of (13 + 2 for a magic weapon) - THAC0 18 = 3, so we hit AC of 3. The issue is that in the AD&D rules at any point actually explain the process of attacking in that way. So the process isn't hard at all, its not really that much harder than d20 roll + BAB + Mods = AC. The difference is that the rules in 3E explain this all very clearly in the rules dealing with attacks. The other big difference is that AD&D had a bunch of disparate subsystems that didn't really add up the same since some were roll under with modifiers to die rolls, others were roll over with modifiers to die rolls, some were roll under with modifiers to target numbers. On the last one look at saving throws. A bonus from some kind of item was say +2 to Save vs Wands. That's actually a bonus to the score, so if your character had a score of 16in that save category, while wearing the magic item it became 18, which only fails on a 19 or 20, rather than a 17 through 20. The biggest change 3E did was consolidate the way rolls were made to begin with. THAC0 is easy enough, but there is no reason it should be a completely different set of math for task resolution from every other task resolution in the game. So it should either all work like THAC0, or should all work like something else, but having a dozen different methods to calculate success from rolling a d20 is why THAC0 has a bad reputation, its the poster child for mismatched task resolutions. [/QUOTE]
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