BECMI Thaco roll

Classic D&D, also known as BECMI uses a ToHitArmorClass0 to determine AC hit. I need a macro that does the following: (1)ask for the Thaco number for the player/creature (2)roll 1d20 (3)subtract the 1d20 roll from the Thaco. I know how to add but not subtract.

<a href="https://app.roll20.net/forum/post/734108/help-with-simple-macro-for-2nd-edition-d-and-d" rel="nofollow">https://app.roll20.net/forum/post/734108/help-with-simple-macro-for-2nd-edition-d-and-d</a> <a href="https://app.roll20.net/forum/post/2327787/is-there-an-api-slash-macro-i-can-use-a-single-roll-for-3-calculations/?pageforid=2327923#post-2327923" rel="nofollow">https://app.roll20.net/forum/post/2327787/is-there-an-api-slash-macro-i-can-use-a-single-roll-for-3-calculations/?pageforid=2327923#post-2327923</a>

Thank you for the links, but I can't get any of them to work. I can do the roll using BASIC :&nbsp; &nbsp;a=int(rnd(1)*20) + 1 &nbsp;print"Thaco roll for encounters" &nbsp;input"Thaco number? ";d &nbsp;print"add modifiers" &nbsp;input m &nbsp;n=d+m &nbsp;tr=n-a &nbsp;if tr&gt;10 then tr=10 &nbsp;if tr&lt;-10 then tr=-10 &nbsp;print &nbsp;print"AC hit=";tr So how do I convert this into a macro? Jarren said: <a href="https://app.roll20.net/forum/post/734108/help-with-simple-macro-for-2nd-edition-d-and-d" rel="nofollow">https://app.roll20.net/forum/post/734108/help-with-simple-macro-for-2nd-edition-d-and-d</a> <a href="https://app.roll20.net/forum/post/2327787/is-there-an-api-slash-macro-i-can-use-a-single-roll-for-3-calculations/?pageforid=2327923#post-2327923" rel="nofollow">https://app.roll20.net/forum/post/2327787/is-there-an-api-slash-macro-i-can-use-a-single-roll-for-3-calculations/?pageforid=2327923#post-2327923</a>

I think this will work: [[{[[{[[?{Input Thaco} + ?{Input Modifiers}+0d0]]-[[1d20]],10}dh1]],-10}dl1]] Basically it figures your roll and drops the higher of the result or 10, then drops the lower of that result or -10.

One nifty thing you can do with Keith's approach is put it in a template and show the roll and result separately, like &amp;{template:default} {{name=NAME HERE}} [[{[[{?{THAC0|10} - [[1d20]],10}dh1]],-10}dl1]] {{THAC0=[[?{THAC0}]] }}{{d20 roll=$[[0]]}} {{AC Hit=$[[2]]}} This will give you a result that looks like Just change the NAME HERE part to the text you want, or remove it entirely if you don't want a title.

This seems to work great but I tested it and the THACO was 18, the d20 roll was 6, so that should have given me a 12 but it showed 10 instead. I love the idea but I also need a modifier check. GiGs said: One nifty thing you can do with Keith's approach is put it in a template and show the roll and result separately, like &amp;{template:default} {{name=NAME HERE}} [[{[[{?{THAC0|10} - [[1d20]],10}dh1]],-10}dl1]] {{THAC0=[[?{THAC0}]] }}{{d20 roll=$[[0]]}} {{AC Hit=$[[2]]}} This will give you a result that looks like Just change the NAME HERE part to the text you want, or remove it entirely if you don't want a title.

Isnt there a maximum of 10, and minimum or -10? Thats what the basic code suggests above. I forgot to include the modifier (weird, I thought it was there), for that: &amp;{template:default} {{name=NAME HERE}} [[{[[{?{THAC0|10} + ?{Modifier?|0} - [[1d20]],10}dh1]],-10}dl1]] {{THAC0=[[?{THAC0}]] }}{{d20 roll=$[[0]]}} {{AC Hit=$[[2]]}} and if you want to show it on the printout &amp;{template:default} {{name=NAME HERE}} [[{[[{?{THAC0|10} + ?{Modifier?|0} - [[1d20]],10}dh1]],-10}dl1]] {{THAC0=[[?{THAC0}]] }}{{Modifier=[[?{Modifier?}]] }} {{d20 roll=$[[0]]}} {{AC Hit=$[[2]]}} I;m not sure how the modifier works, you might want to change it to a - instead of a +.

If you want to remove the max of 10 and min of -10 that simplifies the code a bit. &amp;{template:default} {{name=NAME HERE}} [[?{THAC0|10} +?{Modifier|0} - [[1d20]] ]] {{THAC0=[[?{THAC0}]] }} {{Modifier=[[?{Modifier|0}]] }} {{d20 roll=$[[0]]}} {{AC Hit=$[[1]]}} With the same provisor about the modifier.

This one works great. Thank you so much! GiGs said: If you want to remove the max of 10 and min of -10 that simplifies the code a bit. &amp;{template:default} {{name=NAME HERE}} [[?{THAC0|10} +?{Modifier|0} - [[1d20]] ]] {{THAC0=[[?{THAC0}]] }} {{Modifier=[[?{Modifier|0}]] }} {{d20 roll=$[[0]]}} {{AC Hit=$[[1]]}} With the same provisor about the modifier.

That's great! I just remembered, if you do switch the modifier to a nagtive you should bracket the modifier, like so: [[?{THAC0|10} -(?{Modifier|0}) - [[1d20]] ]] This is to avoid a problem with entering a negative modifier, when you have, say - -3. Roll20 doesnt like two negative signs, but if your put the -3 in brackets it works properly, so -(-3) is fine.

GiGs said: Isnt there a maximum of 10, and minimum or -10? Thats what the basic code suggests above. Yeah, that's what I gleaned from the code block. It's a lot simpler without those constraints.

Hmmm. I used a Thaco of 18 with a -2 modifier and rolled a 20 on the d20. The result should be -4 [(18-2)-20] but it comes up 0. If I use the macro without the min/max 10s it works perfectly. I've tried making my own macros but I'm so used to writing BASIC programs, the formatting confuses me.

Applying both a minimum of -10 and a max of 10 on this roll requires complex syntax. There's likely a mistake in my code. Does Keith's work okay? Also do you need those constraints?

Keith's works great. The 10's restraints are optional I guess. There are ACs higher/lower than 10/-10 but they're rarely used.

If Keith's works fine, you can just swap it into the template I posted, with a few tweaks, like so: /w gm &amp;{template:default} {{name=NAME HERE}} [[{[[{[[?{THAC0|0} + ?{Modifier|0}+0d0]]-[[1d20]],10}dh1]],-10}dl1]] {{THAC0=[[?{THAC0}]] }} {{Modifier=[[?{Modifier|0}]] }} {{d20 roll=$[[1]]}} {{AC Hit=$[[2]]}} But if you need to account for the occasional above 10 or below -10 AC, it's probably best top use the simpler version that allows exceeding the ends.

Thank you GiGs, it's greatly appreciated.