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<blockquote data-quote="Mannahnin" data-source="post: 9590539" data-attributes="member: 7026594">I suppose that comes down to what you mean by THAC0.&nbsp; Are we just talking about the value, or about the whole algorithm of how you determine your number needed to hit?&nbsp; ie: THAC0 as a system, rather than just a value. Because when we're talking about how THAC0 is used in 2E, and by folks using it as a simplification of 1E, it's usually both.While yes, you look up your number needed To Hit Armor Class 0 on a table either way, the attack algorithm in 2E is functionally that you subtract the AC from your THAC0 to find out what number you need to hit. And if that number is over 20, you just revert to the auto-hit on a 20 rule.If I make a 1st level Fighter in 2E I look up the Calculated THAC0s chart on page 91 of the PH and I see that my THAC0 is 20.&nbsp; So when I run into an AC5 enemy I know I need a 15 or better to hit.&nbsp; But if by terrible mischance I run into an enemy with AC -5 that would be a 25, except for the auto-hit on a 20 rule.If I make a 1st level Fighter in 1E I can look up the Attack Matrix for Fighters (et al.) on page 74 of the DMG and see that same 20 to hit AC0, but if I run into that AC -5 enemy my target number is instead a 21, which I can't hit at all unless I have a modifier to apply.</blockquote>

[QUOTE="Mannahnin, post: 9590539, member: 7026594"] I suppose that comes down to what you mean by THAC0. Are we just talking about the value, or about the whole algorithm of how you determine your number needed to hit? ie: THAC0 as a system, rather than just a value. Because when we're talking about how THAC0 is used in 2E, and by folks using it as a simplification of 1E, it's usually both. While yes, you look up your number needed To Hit Armor Class 0 on a table either way, the attack algorithm in 2E is functionally that you subtract the AC from your THAC0 to find out what number you need to hit. And if that number is over 20, you just revert to the auto-hit on a 20 rule. If I make a 1st level Fighter in 2E I look up the Calculated THAC0s chart on page 91 of the PH and I see that my THAC0 is 20. So when I run into an AC5 enemy I know I need a 15 or better to hit. But if by terrible mischance I run into an enemy with AC -5 that would be a 25, except for the auto-hit on a 20 rule. If I make a 1st level Fighter in 1E I can look up the Attack Matrix for Fighters (et al.) on page 74 of the DMG and see that same 20 to hit AC0, but if I run into that AC -5 enemy my target number is instead a 21, which I can't hit at all unless I have a modifier to apply. [/QUOTE]

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