tag:blogger.com,1999:blog-3496022381555730790.post541197248149981924..comments2018-05-21T03:50:32.362-05:00Comments on Retro RPG Library: THAC0 ExplainedRetro RPGhttp://www.blogger.com/profile/16447990542977186558noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-3496022381555730790.post-13859783472182528202018-04-26T22:43:17.850-05:002018-04-26T22:43:17.850-05:00As a math teacher I'll point out that you stil...As a math teacher I'll point out that you still subtract negative AC, it's just that subtracting a negative, as any third grader can confirm, is the same as adding a positive.<br /><br />Personally I always thought the system was pretty straightforward and easy, never understood the complaints. heresolonghttps://www.blogger.com/profile/00461382067580153600noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-64539727855651447742018-03-20T13:42:10.807-05:002018-03-20T13:42:10.807-05:00A much easier way is know you thaco. Say 18 on the...A much easier way is know you thaco. Say 18 on the bottom of your sheet write 10 to -10 on one line. On the second fill in the chart.<br />so<br />AC 3, 2, 1, 0,-1,-2,-3<br /> 15,16,17,18,19,20,20, etc . <br />Roll a d20 add your mods check chart. Hey dm I hit ac 2 is the orc hit? Unknownhttps://www.blogger.com/profile/07501505207412437336noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-43227952343899657032017-07-20T13:00:55.362-05:002017-07-20T13:00:55.362-05:00I very much desire to frame this and place it abov...I very much desire to frame this and place it above my mantle. Wait, I don't have a mantle, Argh!Unknownhttps://www.blogger.com/profile/11330730978515259902noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-57011324958261561222016-06-02T21:31:32.960-05:002016-06-02T21:31:32.960-05:00The easiest way to explain THAC0 as a single formu...The easiest way to explain THAC0 as a single formula is this: <br /><br />THAC0 - (d20 roll + mods) = AC hit<br /><br />Anything with an AC at or worse than that is hit, roll damage.<br /><br />It keeps the modifiers with the same sign regardless of whether it's the attack roll or the damage roll, that is, a +3 modifier is added to the d20 roll <i>and</i> added to damage die roll (subtracting a bonus is counterintuitive, no matter how simple the actual calculation is). <br /><br />It's also the simplest one line algebraic formula for it I've ever seen while keeping the players' stuff on the players' side and the DM's stuff on the DM's side. Explanations that require the player to know the target AC are poorer, as that's the sort of thing many (if not most) DMs don't want to give out. <br /><br />In practice, though, players rarely use any actually formula. From an algebraic standpoint, the negative sign can be distributed to the d20 and the modifiers, and the addition of the negative numbers can be done in any order (subtraction is really adding a negative number, and addition is commutative). Which is why many players usually pre-calculate their modified THAC0 by subtracting the modifiers (which don't usually change), and then just subtract the d20 from the modified THAC0. It's mathematically identical, and may be a bit quicker at the table, but it's not nearly as elegant to explain. Dave Zankohttps://www.blogger.com/profile/09537336843512185604noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-4629030887630609442015-10-16T17:33:16.516-05:002015-10-16T17:33:16.516-05:00Well done & thanks !Well done & thanks !Mike Lawhttps://www.blogger.com/profile/14212265136239518455noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-27364465579715669462014-05-04T16:44:50.133-05:002014-05-04T16:44:50.133-05:00That's fantastic. simply the best explination ...That's fantastic. simply the best explination about THAC0 i've heard yet. thank you very much.Steve Kaylorhttps://www.blogger.com/profile/11818669254711878320noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-36241259987456421792013-08-21T12:05:18.312-05:002013-08-21T12:05:18.312-05:00I always liked the quirks of the old AD&D syst...I always liked the quirks of the old AD&D system. There's no problem using a THACO system or the AC tables which can go beyond -10. The system worked well enough.<br /><br />Looking at the AC for a Red Chromatic Dragon you can see that the last age category has AC -11. <br /><br />http://www.lomion.de/cmm/dragcred.php<br /><br />I think the problem with people and the rules is they use them too rigidly. Why not ignore various restrictions if you wish? SpookyOnehttps://www.blogger.com/profile/04247845234734644470noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-51769818988770953532013-01-14T20:00:04.145-06:002013-01-14T20:00:04.145-06:00I was using a THACO before second edition... it wa...I was using a THACO before second edition... it was just easier than listing the To Hits for each AC..Preaching Plumberhttps://www.blogger.com/profile/00647400043987605482noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-51571069548329875762012-12-06T05:03:09.525-06:002012-12-06T05:03:09.525-06:00Tks a lot. All the explanations i've read abou...Tks a lot. All the explanations i've read about thac0 simply FORGET to mention that, after all calculations to know if you hit the opponent, you have to roll dice AGAIN to calculate damage. Really. They forget. Indeed I haven't ever played D&D, but I'm playing Baldur's Gate and wanted to understand the workings. Tks for mentioning the damage roll.johnny brighthttps://www.blogger.com/profile/07828542159867643027noreply@blogger.comtag:blogger.com,1999:blog-3496022381555730790.post-46217737406260555622012-07-27T16:22:11.386-05:002012-07-27T16:22:11.386-05:00Except that 2nd edition does not allow for armor b...Except that 2nd edition does not allow for armor better than -10. <br /><br />Masterful 3.5 Edition is simple, logical, and allows a ceiling of infinite armor rating.Anonymousnoreply@blogger.com