Thread: RPG Game Mechanic Survey
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December 1st, 2017, 03:23 #11
Edit 2: Okay, I think I need to make this make sense to myself more than anything. Your method is Die Roll (call it 12) plus Mod (call it +4) minus AC (call it 5) = 11 vs. TN. Great. But what is the Target Number? The order I gave, gives the value of TN. TN = THAC0 (1st level 20) - 5 = 15, or 12+4 = 16 vs TN 15. It isn't an issue of addition is commutative, rather it's a two unrelated equations being compared to see which is greater.
In other words, no, in this case it isn't commutative because it's (a+b = c ≥ f = d-e).
Original: Sure, but the point was that you're missing a step, since A + B - C = D ≥ TN, in this case, but you can't compare D to TN without first determining Y (THAC0) - D = TN.
Or, what I'm trying to say in game terms is d20 result + mod - AC = total ≥ TN = THACO - AC. Blah, maths classes were a long time ago for this. I think what I'm trying to say is that you can't get a result that needs to be equal to or greater than a Target Number that is determined by a different formula.
The way you put it sure, you'd know the result, but still not know the target number.
Edit: Must be getting late, I realize I'm starting to be redundant in different wordings.Last edited by sjard; December 1st, 2017 at 04:24.
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December 1st, 2017, 04:28 #12
OK, so I thought it was obvious (but maybe not): TN is the THAC0 (in both formulas, because both formulas are the same formula, just rearranged.
As you expressed it: (M is Modifiers)
1d20 + M >= THAC0-AC - which rearranged is
1d20 + M + AC >= THAC0 - which is how I expressed it - BUT yes, I did have the sign of the AC-term wrong - stupid me letting that typo past proof-reading (and that's what was almost certainly tripping you up)
And using your figures:
12+4 >= 20-5 == 16 >= 15 (a hit by a single point) - which rearranged is
12+4+5 >= 20 == 21 >= 20 (also a hit by a single point)
Does that make sense now (especially now that I've fixed up the sign of the AC-term)?Dulux-Oz
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December 1st, 2017, 04:41 #13
Yeah, the function change, plus the spelling out that THAC0 = TN helps. I kept sitting there going "Something isn't right here, but I can't quite put my finger on it."
Last edited by sjard; December 1st, 2017 at 04:46.
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December 1st, 2017, 04:55 #14
Dulux-Oz
√(-1) 2^3 Σ Π
...And it was Delicious!
Alpha-Geek
ICT Professional
GMing Since 1982
NSW, Australia, UTC +10
LinkedIn Profile: www.linkedin.com/in/mjblack
Watch our games on Twitch: www.twitch.tv/dulux_oz
Support Me on Patreon: www.patreon.com/duluxoz
Past Games, etc, on my YouTube Channel: www.youtube.com/c/duluxoz
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December 10th, 2017, 16:14 #15
RPG Game Mechanics
Rolemaster Roll d100% and add Total Skill Bonus=Rank+Stat bonii. 101+ and you succeed. Later versions need 111+. Special and zany events occur on natural '66' and '00' results! Critical tables to add even more flavour to combat results, whether Spell or Arms!
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