# Tagged Questions

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### 3d6 vs a d20: What is the effect of a different probability curve?

What is the effect on game play of replacing d20 rolls with 3d6 rolls in a D&D 4e campaign? I started thinking about this after reading this question where the example was given of playing a d20 ...
4k views

### How does rolling two dice and taking the highest affect the average outcome?

I've read that the D&D 5E playtest has an "advantage" concept where instead of rolling 1d20, you roll 2d20 and take the highest. Likewise, disadvantage means rolling 2d20 and taking the lowest. ...
2k views

### Is it possible to produce a bowl-shaped probability curve with dice rolls?

In D&D's basic D20 system, you roll one d20 and add in some modifiers, then compare the result to a target number. Each modifier effectively adds or removes a 5% chance of success with the roll. ...
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### Earthdawn dice roll probabilities

After ad-hoc running Misguided Ambitions with my regular DnD 4E group - because one guy was MIA - I had a discussion with one of the players about Earthdawn's dice mechanics. The player argued that ...
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### What is the statistically superior character creation method, twelve 3d6 or six 4d6?

The D&D 3.5 Player's Handbook gives (among others) two preferred methods to roll ability scores for a new character: a) roll 3d6 twelve times and keep the preferred six results, or b) roll 4d6 and ...
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### Roll For Shoes - Does the advancement system work for longer campaigns?

I'm about to start in on a new campaign with the Roll For Shoes system, but I'm concerned that the characters will swiftly outstrip basic and intermediate challenges as they grow in dice. In the ...
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### Chances of rolling up characters for classes in first edition Dungeons and Dragons

I recently read a blog post about the probabilities of rolling up a character that would meet the requirements for all of the different classes in first edition Dungeons and Dragons. I'd love to read ...
2k views

### What's the probability curve of the D10 Storytelling System?

Recently a friend commented that he thought the dice pool in the d10 Storytelling System actually gave mediocre results, and that by increasing the number of dice thrown you were actually decreasing ...
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### How can I model Burning Wheel probabilities in AnyDice?

I have a basic intuition about dice in Burning Wheel, but it's handy to be able to look at actual probability distributions to hone your intuition. Especially since important rolls can involve ...
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### How can I convert D&D Next Saving Throws into Defences?

In the last public playtest packet, saving throws for spells had the following formula: The DC was set to 8 + prof bonus + magical stat bonus. The target would then throw a saving throw, adding their ...
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### Can the astrology helping die decrease the chance of success?

Astrology can help most tests, but has a chance of actually taking away a success from the roll, thought it is unlikely. Ignoring the fiction and focusing only on the rules, is there any situation ...
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### How much is a Second roll worth in Modifier Bonus

That is to say, the value of a second roll, how much of a bonus value is it worth. For example: when you make a saving throw, attack or check roll, when does +bonus to the roll and rolling twice ...
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### Explain why Ubiquity doesn't have an asymmetrical bell curve like most dice pool systems?

A post on Pen and Paper Games forum states that the Ubiquity system does not have an asymmetrical bell curve as other dice pool systems typically do (like the D6 system). Where can I find this ...
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### A system that models improved threat range of critical misses?

Have you ever fumbled with a flail? It sucks, especially when you are first learning it. It can happen very often; Sometimes in such a terrible way it far surpasses the risk of swinging a staff, hands ...
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### Calculating dice pool probability with limited rerolls

I need a probability calculation script that works with various dice and dice pool sizes, that accounts for a mechanic that allows you to reroll up to X dice that are failures, but ONLY once per die. ...
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### How do I calculate the chance of hits?

(I do not know if I should post this in math.stackexchange.com, so I try to phrase it in a way that it makes sense for non-roleplayers. Just in case it gets moved) In the latest two editions of ...