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Radiance: Roleplaying Game Rules 
4th-Mar-2009 07:50 pm
semi-transparent eye

   Radiance games use a dedicated game mechanic based on six-sided and eight-sided dice. Almost all actions and situations in a Radiance scenario are resolved using the same basic rules, described below.

Radiance – The Basic Rules

   Every character has nine Attributes, rated from 1 to 6, which are inherent qualities common to all people. Attributes are instinctive, which means that they are rolled using six-sided dice (d6). The nine attributes are Coordination, Stamina, Strength, Logic, Memory, Perception, Charm, Intuition, and Resolve:

Coordination
This Attribute covers physical agility and the body’s harmonious movements of muscle and nerves for most effective results.
Stamina
This Attribute covers physical constitution, enduring strength, and energy; as well as the power to endure disease, fatigue, and privation.
Strength
This Attribute covers bodily vigour and muscular power.
 
Logic
This Attribute covers a mental faculty of sound judgment and reasoning, applicable to any branch of knowledge or study.
Memory
This Attribute covers a mental faculty of retaining, recalling, and recognising past experiences, information, and impressions.
Perception
This Attribute covers a capability for comprehending and identifying internal ideas and external evidence through the senses or the mind.
 
Charm
This Attribute covers a manner that pleases or attracts others, and inducing other people to behave as desired through the power of personality.
Intuition
This Attribute covers an inwardly aware personality capable of quick and keen insights, independent of your primary senses or any reasoning process.
Resolve
This Attribute covers a personal quality that is resolute and determined, and firm of purpose or intent.

   An average person has 3 dice in each of their Attributes:

Attribute:Means...
           1 rankDeficient or disabled
   2 ranksPoor
   3 ranksAverage
   4 ranksExceptional
   5 ranksExtraordinary
         6 ranksHuman peak

   Characters are also defined by their Skills, also rated from 1 to 6, which are learned or acquired characteristics, abilities, or areas of competence. Skills are conscious, which means that they are rolled using eight-sided dice (d8). Possessing 1 die in a Skill represents basic training or familiarity, whereas 2 dice represents competency. Skills with 3 or more dice indicate above-average talent or increasing expertise.

Skill Level:Means...
           0 ranksUntrained or inexperienced
   1 rankBasic training or familiarity
   2 ranksCompetent
   3 ranksExperienced or talented
   4 ranksProfessional or gifted
   5 ranksGenius
   6 ranksPeerless

   All actions are based on a combination of one of the character’s Attributes plus one of his Skills. Whenever you attempt an action, the GM calls for an appropriate Skill and determines the target difficulty number. To resolve an action, you roll a dice pool determined by the relevant Attribute and Skill. You roll 1d6 for each point of an Attribute, and 1d8 for each point of a Skill. For example, if you had Logic 3 + Navigation 2, you would roll 3d6+2d8.

The result is the highest score on a single die or the total of any set of matching dice. If the result is equal to or higher than the difficulty assigned by the GM, then the action is successful.

If you roll more than one set of matching dice, you choose either set to determine the success of your roll. The total of the numbers on these dice is your result.

   Occasionally you will get a bonus to the use of some skills (for example, a +2 bonus to all Logic: Pilot Spacecraft rolls). Rather than rolling even more dice, this allows you to add 2 to the total of your chosen Pilot Spacecraft dice when determing the final total. Skills for which you have a bonus are more reliable, because this bonus increases your minimum result as well as your average.

   The GM assigns a target difficulty number to each action based on the following guidelines:

           DifficultyResult
   Routine6
   Easy8
   Average10
   Hard13
   Very Hard15
   Extraordinary18
   Superhuman21
   Unfathomable25
   Impossible30

   The quality of success or failure is determined by the number of matched dice in a roll. For example, against a Very Hard difficulty of 15, a roll of five 3s is a better success than a roll of three 5s, even though they both result in a total of 15.

   More dice in a successful roll is good, but more dice in an unsuccessful roll is bad. As another example, you might choose a matched set of five 3s. If the difficulty is Very Hard (with a target result of 15), then you get an astounding success ("five successes"). However, if the difficulty is Extraordinary (requiring an 18), then you have suffered a horrible failure ("five losses").

   As Skills are conscious, they are much more advantageous than Attributes. Not only can you roll higher numbers on a d8 than on a d6, if you roll an “8” on your action attempt, you can choose to change that die to any number of your choice. For example, if you had rolled two 5s and one 8, you could change the 8 to a 5. This makes your action more likely to meet the target difficulty number, and gives you a higher quality of success if you do.

   Nothing special happens when you roll a 6 on 1d6, or if you roll a 1 on any die.

   In summary...

  • Roll 1d6 for each point in an Attribute and 1d8 for each point in a Skill
  • Choose the highest single die or highest total of matching dice; this is your total
  • Any 8s rolled on d8s are wild, and can be changed to any other number rolled
  • If you get a bonus to the Skill used, add it to your total
  • If your final total is equal to or higher than the Difficulty, your action is successful with a number of successes equal to the number of matching dice
  • If your final total is lower than the Difficulty, your action is unsuccessful with a number of losses equal to the number of matching dice

   There are some more specific details for particular situations (such as actions in combat, or actions that affect a much larger group), but the same basic rules still apply. Determine how many six-sided and eight-sided dice you need to roll, choose the highest single die or set of matched dice, and compare the result to an appropriate difficulty. Any questions? Leave a comment.

Comments 
4th-Mar-2009 03:55 pm (UTC)
Sounds like something a bit similar in concept to both wild talents and cthulhutech - both of which I enjoy, so yay!
4th-Mar-2009 09:15 pm (UTC)
I haven't read Cthulhutech. The dice pool mechanic described above is similar to The Whispering Vault (which I was running when I originally devised it) and Yahtzee. It uses two different kinds of dice so that attributes and skills have different effects – I wanted a skilled professional to get slightly higher results consistently than a gifted amateur with the same number of dice; thus the wild 8s.

There is a more obvious comparison to the One Roll Engine/Reign when you look at the rules for cohorts, which are groups of characters with shared goals and resources (for example, a group of PCs). Cohorts are similar to Companies in Greg Stolze's Reign RPG. I even considered simply using Reign after it was released, but decided against it. Converting Reign to a science fiction setting would be at least as much work as finishing Radiance, and I didn't want to scrap my existing work. Radiance seemed to work just fine at Sydcon last year, and will get another test at Eye-con next month. I'm even thinking of using it at GenCon in September.
5th-Mar-2009 01:31 am (UTC)
I quite like it aesthetically, but it does feel a little like ORE in that it's quite hard to succeed at anything reliably without being really good at whatever you're trying to do. I haven't rigorously analysed the probabilities (I don't know enough about probability assessment to be able to work it out except by brute force), but it seems, eyeballing it, like you'd need about five dice to hit 10 fifty percent of the time?
5th-Mar-2009 05:06 am (UTC)
I did crunch the numbers some time ago; I wanted to make sure that the difficulty thresholds I'd chosen were appropriate. I'll post them here after I get home later tonight.
5th-Mar-2009 12:14 pm (UTC) - Probabilities, part one
( Attribute 1 , Skill 0 ) vs. ( Diff 6 ) = 16.7%
( Attribute 1 , Skill 0 ) vs. ( Diff 8 ) = 0.0%
( Attribute 1 , Skill 0 ) vs. ( Diff 10 ) = 0.0%
( Attribute 1 , Skill 0 ) vs. ( Diff 13 ) = 0.0%
( Attribute 1 , Skill 0 ) vs. ( Diff 15 ) = 0.0%
( Attribute 1 , Skill 0 ) vs. ( Diff 18 ) = 0.0%

( Attribute 1 , Skill 1 ) vs. ( Diff 6 ) = 54.1%
( Attribute 1 , Skill 1 ) vs. ( Diff 8 ) = 18.8%
( Attribute 1 , Skill 1 ) vs. ( Diff 10 ) = 4.2%
( Attribute 1 , Skill 1 ) vs. ( Diff 13 ) = 0.0%
( Attribute 1 , Skill 1 ) vs. ( Diff 15 ) = 0.0%
( Attribute 1 , Skill 1 ) vs. ( Diff 18 ) = 0.0%

( Attribute 1 , Skill 2 ) vs. ( Diff 6 ) = 78.0%
( Attribute 1 , Skill 2 ) vs. ( Diff 8 ) = 39.2%
( Attribute 1 , Skill 2 ) vs. ( Diff 10 ) = 13.8%
( Attribute 1 , Skill 2 ) vs. ( Diff 13 ) = 3.7%
( Attribute 1 , Skill 2 ) vs. ( Diff 15 ) = 2.1%
( Attribute 1 , Skill 2 ) vs. ( Diff 18 ) = 0.3%

( Attribute 1 , Skill 3 ) vs. ( Diff 6 ) = 90.7%
( Attribute 1 , Skill 3 ) vs. ( Diff 8 ) = 58.4%
( Attribute 1 , Skill 3 ) vs. ( Diff 10 ) = 27.1%
( Attribute 1 , Skill 3 ) vs. ( Diff 13 ) = 10.2%
( Attribute 1 , Skill 3 ) vs. ( Diff 15 ) = 6.4%
( Attribute 1 , Skill 3 ) vs. ( Diff 18 ) = 1.3%

( Attribute 1 , Skill 4 ) vs. ( Diff 6 ) = 96.6%
( Attribute 1 , Skill 4 ) vs. ( Diff 8 ) = 74.0%
( Attribute 1 , Skill 4 ) vs. ( Diff 10 ) = 42.0%
( Attribute 1 , Skill 4 ) vs. ( Diff 13 ) = 19.5%
( Attribute 1 , Skill 4 ) vs. ( Diff 15 ) = 12.4%
( Attribute 1 , Skill 4 ) vs. ( Diff 18 ) = 3.5%

( Attribute 1 , Skill 5 ) vs. ( Diff 6 ) = 98.9%
( Attribute 1 , Skill 5 ) vs. ( Diff 8 ) = 84.8%
( Attribute 1 , Skill 5 ) vs. ( Diff 10 ) = 56.1%
( Attribute 1 , Skill 5 ) vs. ( Diff 13 ) = 30.3%
( Attribute 1 , Skill 5 ) vs. ( Diff 15 ) = 20.4%
( Attribute 1 , Skill 5 ) vs. ( Diff 18 ) = 6.9%

( Attribute 1 , Skill 6 ) vs. ( Diff 6 ) = 99.7%
( Attribute 1 , Skill 6 ) vs. ( Diff 8 ) = 92.0%
( Attribute 1 , Skill 6 ) vs. ( Diff 10 ) = 69.2%
( Attribute 1 , Skill 6 ) vs. ( Diff 13 ) = 41.3%
( Attribute 1 , Skill 6 ) vs. ( Diff 15 ) = 29.7%
( Attribute 1 , Skill 6 ) vs. ( Diff 18 ) = 11.8%

( Attribute 2 , Skill 0 ) vs. ( Diff 6 ) = 38.9%
( Attribute 2 , Skill 0 ) vs. ( Diff 8 ) = 8.4%
( Attribute 2 , Skill 0 ) vs. ( Diff 10 ) = 5.6%
( Attribute 2 , Skill 0 ) vs. ( Diff 13 ) = 0.0%
( Attribute 2 , Skill 0 ) vs. ( Diff 15 ) = 0.0%
( Attribute 2 , Skill 0 ) vs. ( Diff 18 ) = 0.0%

( Attribute 2 , Skill 1 ) vs. ( Diff 6 ) = 70.5%
( Attribute 2 , Skill 1 ) vs. ( Diff 8 ) = 30.7%
( Attribute 2 , Skill 1 ) vs. ( Diff 10 ) = 12.9%
( Attribute 2 , Skill 1 ) vs. ( Diff 13 ) = 0.7%
( Attribute 2 , Skill 1 ) vs. ( Diff 15 ) = 0.7%
( Attribute 2 , Skill 1 ) vs. ( Diff 18 ) = 0.3%

( Attribute 2 , Skill 2 ) vs. ( Diff 6 ) = 87.6%
( Attribute 2 , Skill 2 ) vs. ( Diff 8 ) = 51.7%
( Attribute 2 , Skill 2 ) vs. ( Diff 10 ) = 24.7%
( Attribute 2 , Skill 2 ) vs. ( Diff 13 ) = 5.3%
( Attribute 2 , Skill 2 ) vs. ( Diff 15 ) = 3.8%
( Attribute 2 , Skill 2 ) vs. ( Diff 18 ) = 1.1%

( Attribute 2 , Skill 3 ) vs. ( Diff 6 ) = 95.4%
( Attribute 2 , Skill 3 ) vs. ( Diff 8 ) = 69.4%
( Attribute 2 , Skill 3 ) vs. ( Diff 10 ) = 38.5%
( Attribute 2 , Skill 3 ) vs. ( Diff 13 ) = 13.1%
( Attribute 2 , Skill 3 ) vs. ( Diff 15 ) = 9.1%
( Attribute 2 , Skill 3 ) vs. ( Diff 18 ) = 2.8%

( Attribute 2 , Skill 4 ) vs. ( Diff 6 ) = 98.6%
( Attribute 2 , Skill 4 ) vs. ( Diff 8 ) = 82.2%
( Attribute 2 , Skill 4 ) vs. ( Diff 10 ) = 53.2%
( Attribute 2 , Skill 4 ) vs. ( Diff 13 ) = 23.6%
( Attribute 2 , Skill 4 ) vs. ( Diff 15 ) = 16.4%
( Attribute 2 , Skill 4 ) vs. ( Diff 18 ) = 5.7%

( Attribute 2 , Skill 5 ) vs. ( Diff 6 ) = 99.6%
( Attribute 2 , Skill 5 ) vs. ( Diff 8 ) = 90.4%
( Attribute 2 , Skill 5 ) vs. ( Diff 10 ) = 66.2%
( Attribute 2 , Skill 5 ) vs. ( Diff 13 ) = 34.7%
( Attribute 2 , Skill 5 ) vs. ( Diff 15 ) = 25.5%
( Attribute 2 , Skill 5 ) vs. ( Diff 18 ) = 9.9%

( Attribute 2 , Skill 6 ) vs. ( Diff 6 ) = 99.9%
( Attribute 2 , Skill 6 ) vs. ( Diff 8 ) = 95.4%
( Attribute 2 , Skill 6 ) vs. ( Diff 10 ) = 77.3%
( Attribute 2 , Skill 6 ) vs. ( Diff 13 ) = 46.6%
( Attribute 2 , Skill 6 ) vs. ( Diff 15 ) = 35.4%
( Attribute 2 , Skill 6 ) vs. ( Diff 18 ) = 15.7%


Edited at 2009-03-05 12:15 pm (UTC)
5th-Mar-2009 12:15 pm (UTC) - Probabilities, part two

( Attribute 3 , Skill 0 ) vs. ( Diff 6 ) = 60.6%
( Attribute 3 , Skill 0 ) vs. ( Diff 8 ) = 22.6%
( Attribute 3 , Skill 0 ) vs. ( Diff 10 ) = 15.3%
( Attribute 3 , Skill 0 ) vs. ( Diff 13 ) = 0.9%
( Attribute 3 , Skill 0 ) vs. ( Diff 15 ) = 0.9%
( Attribute 3 , Skill 0 ) vs. ( Diff 18 ) = 0.4%

( Attribute 3 , Skill 1 ) vs. ( Diff 6 ) = 83.4%
( Attribute 3 , Skill 1 ) vs. ( Diff 8 ) = 45.1%
( Attribute 3 , Skill 1 ) vs. ( Diff 10 ) = 24.6%
( Attribute 3 , Skill 1 ) vs. ( Diff 13 ) = 2.7%
( Attribute 3 , Skill 1 ) vs. ( Diff 15 ) = 2.8%
( Attribute 3 , Skill 1 ) vs. ( Diff 18 ) = 1.3%

( Attribute 3 , Skill 2 ) vs. ( Diff 6 ) = 94.0%
( Attribute 3 , Skill 2 ) vs. ( Diff 8 ) = 64.4%
( Attribute 3 , Skill 2 ) vs. ( Diff 10 ) = 37.6%
( Attribute 3 , Skill 2 ) vs. ( Diff 13 ) = 8.5%
( Attribute 3 , Skill 2 ) vs. ( Diff 15 ) = 7.2%
( Attribute 3 , Skill 2 ) vs. ( Diff 18 ) = 2.8%

( Attribute 3 , Skill 3 ) vs. ( Diff 6 ) = 98.0%
( Attribute 3 , Skill 3 ) vs. ( Diff 8 ) = 79.0%
( Attribute 3 , Skill 3 ) vs. ( Diff 10 ) = 50.9%
( Attribute 3 , Skill 3 ) vs. ( Diff 13 ) = 17.6%
( Attribute 3 , Skill 3 ) vs. ( Diff 15 ) = 13.5%
( Attribute 3 , Skill 3 ) vs. ( Diff 18 ) = 5.2%

( Attribute 3 , Skill 4 ) vs. ( Diff 6 ) = 99.5%
( Attribute 3 , Skill 4 ) vs. ( Diff 8 ) = 88.6%
( Attribute 3 , Skill 4 ) vs. ( Diff 10 ) = 64.1%
( Attribute 3 , Skill 4 ) vs. ( Diff 13 ) = 28.7%
( Attribute 3 , Skill 4 ) vs. ( Diff 15 ) = 22.0%
( Attribute 3 , Skill 4 ) vs. ( Diff 18 ) = 9.1%

( Attribute 3 , Skill 5 ) vs. ( Diff 6 ) = 99.9%
( Attribute 3 , Skill 5 ) vs. ( Diff 8 ) = 94.4%
( Attribute 3 , Skill 5 ) vs. ( Diff 10 ) = 75.0%
( Attribute 3 , Skill 5 ) vs. ( Diff 13 ) = 40.8%
( Attribute 3 , Skill 5 ) vs. ( Diff 15 ) = 31.9%
( Attribute 3 , Skill 5 ) vs. ( Diff 18 ) = 13.9%

( Attribute 3 , Skill 6 ) vs. ( Diff 6 ) = 100.0%
( Attribute 3 , Skill 6 ) vs. ( Diff 8 ) = 97.5%
( Attribute 3 , Skill 6 ) vs. ( Diff 10 ) = 83.8%
( Attribute 3 , Skill 6 ) vs. ( Diff 13 ) = 52.2%
( Attribute 3 , Skill 6 ) vs. ( Diff 15 ) = 42.3%
( Attribute 3 , Skill 6 ) vs. ( Diff 18 ) = 20.3%

( Attribute 4 , Skill 0 ) vs. ( Diff 6 ) = 77.7%
( Attribute 4 , Skill 0 ) vs. ( Diff 8 ) = 40.0%
( Attribute 4 , Skill 0 ) vs. ( Diff 10 ) = 27.7%
( Attribute 4 , Skill 0 ) vs. ( Diff 13 ) = 3.3%
( Attribute 4 , Skill 0 ) vs. ( Diff 15 ) = 3.3%
( Attribute 4 , Skill 0 ) vs. ( Diff 18 ) = 1.7%

( Attribute 4 , Skill 1 ) vs. ( Diff 6 ) = 91.9%
( Attribute 4 , Skill 1 ) vs. ( Diff 8 ) = 60.2%
( Attribute 4 , Skill 1 ) vs. ( Diff 10 ) = 37.6%
( Attribute 4 , Skill 1 ) vs. ( Diff 13 ) = 6.4%
( Attribute 4 , Skill 1 ) vs. ( Diff 15 ) = 6.4%
( Attribute 4 , Skill 1 ) vs. ( Diff 18 ) = 3.2%

( Attribute 4 , Skill 2 ) vs. ( Diff 6 ) = 97.5%
( Attribute 4 , Skill 2 ) vs. ( Diff 8 ) = 75.9%
( Attribute 4 , Skill 2 ) vs. ( Diff 10 ) = 50.2%
( Attribute 4 , Skill 2 ) vs. ( Diff 13 ) = 13.6%
( Attribute 4 , Skill 2 ) vs. ( Diff 15 ) = 12.0%
( Attribute 4 , Skill 2 ) vs. ( Diff 18 ) = 5.4%

( Attribute 4 , Skill 3 ) vs. ( Diff 6 ) = 99.3%
( Attribute 4 , Skill 3 ) vs. ( Diff 8 ) = 86.8%
( Attribute 4 , Skill 3 ) vs. ( Diff 10 ) = 62.2%
( Attribute 4 , Skill 3 ) vs. ( Diff 13 ) = 23.5%
( Attribute 4 , Skill 3 ) vs. ( Diff 15 ) = 19.8%
( Attribute 4 , Skill 3 ) vs. ( Diff 18 ) = 8.9%

( Attribute 4 , Skill 4 ) vs. ( Diff 6 ) = 99.8%
( Attribute 4 , Skill 4 ) vs. ( Diff 8 ) = 93.6%
( Attribute 4 , Skill 4 ) vs. ( Diff 10 ) = 73.4%
( Attribute 4 , Skill 4 ) vs. ( Diff 13 ) = 35.2%
( Attribute 4 , Skill 4 ) vs. ( Diff 15 ) = 28.8%
( Attribute 4 , Skill 4 ) vs. ( Diff 18 ) = 13.4%

( Attribute 4 , Skill 5 ) vs. ( Diff 6 ) = 100.0%
( Attribute 4 , Skill 5 ) vs. ( Diff 8 ) = 97.1%
( Attribute 4 , Skill 5 ) vs. ( Diff 10 ) = 82.6%
( Attribute 4 , Skill 5 ) vs. ( Diff 13 ) = 47.4%
( Attribute 4 , Skill 5 ) vs. ( Diff 15 ) = 39.2%
( Attribute 4 , Skill 5 ) vs. ( Diff 18 ) = 19.1%

( Attribute 4 , Skill 6 ) vs. ( Diff 6 ) = 100.0%
( Attribute 4 , Skill 6 ) vs. ( Diff 8 ) = 98.8%
( Attribute 4 , Skill 6 ) vs. ( Diff 10 ) = 89.4%
( Attribute 4 , Skill 6 ) vs. ( Diff 13 ) = 58.8%
( Attribute 4 , Skill 6 ) vs. ( Diff 15 ) = 50.1%
( Attribute 4 , Skill 6 ) vs. ( Diff 18 ) = 25.6%
5th-Mar-2009 12:15 pm (UTC) - Probabilities, part three

( Attribute 5 , Skill 0 ) vs. ( Diff 6 ) = 89.2%
( Attribute 5 , Skill 0 ) vs. ( Diff 8 ) = 56.6%
( Attribute 5 , Skill 0 ) vs. ( Diff 10 ) = 41.1%
( Attribute 5 , Skill 0 ) vs. ( Diff 13 ) = 7.4%
( Attribute 5 , Skill 0 ) vs. ( Diff 15 ) = 7.4%
( Attribute 5 , Skill 0 ) vs. ( Diff 18 ) = 3.9%

( Attribute 5 , Skill 1 ) vs. ( Diff 6 ) = 96.6%
( Attribute 5 , Skill 1 ) vs. ( Diff 8 ) = 73.3%
( Attribute 5 , Skill 1 ) vs. ( Diff 10 ) = 50.8%
( Attribute 5 , Skill 1 ) vs. ( Diff 13 ) = 11.9%
( Attribute 5 , Skill 1 ) vs. ( Diff 15 ) = 11.8%
( Attribute 5 , Skill 1 ) vs. ( Diff 18 ) = 6.4%

( Attribute 5 , Skill 2 ) vs. ( Diff 6 ) = 99.0%
( Attribute 5 , Skill 2 ) vs. ( Diff 8 ) = 85.2%
( Attribute 5 , Skill 2 ) vs. ( Diff 10 ) = 62.1%
( Attribute 5 , Skill 2 ) vs. ( Diff 13 ) = 20.2%
( Attribute 5 , Skill 2 ) vs. ( Diff 15 ) = 18.6%
( Attribute 5 , Skill 2 ) vs. ( Diff 18 ) = 9.3%

( Attribute 5 , Skill 3 ) vs. ( Diff 6 ) = 99.8%
( Attribute 5 , Skill 3 ) vs. ( Diff 8 ) = 92.7%
( Attribute 5 , Skill 3 ) vs. ( Diff 10 ) = 72.7%
( Attribute 5 , Skill 3 ) vs. ( Diff 13 ) = 30.8%
( Attribute 5 , Skill 3 ) vs. ( Diff 15 ) = 27.5%
( Attribute 5 , Skill 3 ) vs. ( Diff 18 ) = 13.6%

( Attribute 5 , Skill 4 ) vs. ( Diff 6 ) = 100.0%
( Attribute 5 , Skill 4 ) vs. ( Diff 8 ) = 96.6%
( Attribute 5 , Skill 4 ) vs. ( Diff 10 ) = 81.7%
( Attribute 5 , Skill 4 ) vs. ( Diff 13 ) = 42.7%
( Attribute 5 , Skill 4 ) vs. ( Diff 15 ) = 37.2%
( Attribute 5 , Skill 4 ) vs. ( Diff 18 ) = 18.5%

( Attribute 5 , Skill 5 ) vs. ( Diff 6 ) = 100.0%
( Attribute 5 , Skill 5 ) vs. ( Diff 8 ) = 98.7%
( Attribute 5 , Skill 5 ) vs. ( Diff 10 ) = 88.5%
( Attribute 5 , Skill 5 ) vs. ( Diff 13 ) = 54.5%
( Attribute 5 , Skill 5 ) vs. ( Diff 15 ) = 47.2%
( Attribute 5 , Skill 5 ) vs. ( Diff 18 ) = 25.2%

( Attribute 5 , Skill 6 ) vs. ( Diff 6 ) = 100.0%
( Attribute 5 , Skill 6 ) vs. ( Diff 8 ) = 99.5%
( Attribute 5 , Skill 6 ) vs. ( Diff 10 ) = 93.3%
( Attribute 5 , Skill 6 ) vs. ( Diff 13 ) = 65.5%
( Attribute 5 , Skill 6 ) vs. ( Diff 15 ) = 57.7%
( Attribute 5 , Skill 6 ) vs. ( Diff 18 ) = 32.4%

( Attribute 6 , Skill 0 ) vs. ( Diff 6 ) = 95.6%
( Attribute 6 , Skill 0 ) vs. ( Diff 8 ) = 71.5%
( Attribute 6 , Skill 0 ) vs. ( Diff 10 ) = 54.2%
( Attribute 6 , Skill 0 ) vs. ( Diff 13 ) = 13.5%
( Attribute 6 , Skill 0 ) vs. ( Diff 15 ) = 13.3%
( Attribute 6 , Skill 0 ) vs. ( Diff 18 ) = 7.1%

( Attribute 6 , Skill 1 ) vs. ( Diff 6 ) = 98.7%
( Attribute 6 , Skill 1 ) vs. ( Diff 8 ) = 83.8%
( Attribute 6 , Skill 1 ) vs. ( Diff 10 ) = 63.5%
( Attribute 6 , Skill 1 ) vs. ( Diff 13 ) = 19.0%
( Attribute 6 , Skill 1 ) vs. ( Diff 15 ) = 19.1%
( Attribute 6 , Skill 1 ) vs. ( Diff 18 ) = 10.4%

( Attribute 6 , Skill 2 ) vs. ( Diff 6 ) = 99.7%
( Attribute 6 , Skill 2 ) vs. ( Diff 8 ) = 91.6%
( Attribute 6 , Skill 2 ) vs. ( Diff 10 ) = 72.8%
( Attribute 6 , Skill 2 ) vs. ( Diff 13 ) = 28.0%
( Attribute 6 , Skill 2 ) vs. ( Diff 15 ) = 26.6%
( Attribute 6 , Skill 2 ) vs. ( Diff 18 ) = 14.3%

( Attribute 6 , Skill 3 ) vs. ( Diff 6 ) = 100.0%
( Attribute 6 , Skill 3 ) vs. ( Diff 8 ) = 96.0%
( Attribute 6 , Skill 3 ) vs. ( Diff 10 ) = 81.2%
( Attribute 6 , Skill 3 ) vs. ( Diff 13 ) = 39.0%
( Attribute 6 , Skill 3 ) vs. ( Diff 15 ) = 36.0%
( Attribute 6 , Skill 3 ) vs. ( Diff 18 ) = 19.3%

( Attribute 6 , Skill 4 ) vs. ( Diff 6 ) = 100.0%
( Attribute 6 , Skill 4 ) vs. ( Diff 8 ) = 98.4%
( Attribute 6 , Skill 4 ) vs. ( Diff 10 ) = 88.0%
( Attribute 6 , Skill 4 ) vs. ( Diff 13 ) = 51.0%
( Attribute 6 , Skill 4 ) vs. ( Diff 15 ) = 45.9%
( Attribute 6 , Skill 4 ) vs. ( Diff 18 ) = 24.8%

( Attribute 6 , Skill 5 ) vs. ( Diff 6 ) = 100.0%
( Attribute 6 , Skill 5 ) vs. ( Diff 8 ) = 99.4%
( Attribute 6 , Skill 5 ) vs. ( Diff 10 ) = 92.8%
( Attribute 6 , Skill 5 ) vs. ( Diff 13 ) = 62.3%
( Attribute 6 , Skill 5 ) vs. ( Diff 15 ) = 55.9%
( Attribute 6 , Skill 5 ) vs. ( Diff 18 ) = 31.6%

( Attribute 6 , Skill 6 ) vs. ( Diff 6 ) = 100.0%
( Attribute 6 , Skill 6 ) vs. ( Diff 8 ) = 99.8%
( Attribute 6 , Skill 6 ) vs. ( Diff 10 ) = 96.1%
( Attribute 6 , Skill 6 ) vs. ( Diff 13 ) = 71.9%
( Attribute 6 , Skill 6 ) vs. ( Diff 15 ) = 65.1%
( Attribute 6 , Skill 6 ) vs. ( Diff 18 ) = 39.2%
5th-Mar-2009 12:33 pm (UTC)
So let's say that you're playing a character who has average Attributes (3) and is competant in a wide range of skills (2 dice). That means that your chances of success should be considered as:
Routine ( Diff 6 ) = 94.0%
Easy ( Diff 8 ) = 64.4%
Average ( Diff 10 ) = 37.6%
Hard ( Diff 13 ) = 8.5%
Very Hard ( Diff 15 ) = 7.2%
Extraordinary ( Diff 18 ) = 2.8%
Given that you need only roll for actions in stressful circumstances, that seems about right to me. Most day-to-day activities are Routine or Easy; Average is "not Easy". In non-stress situations you can either take your time (giving you a bonus to the roll) or assume success if you have the skill.

I don't remember if these probabilities include the "8s are wild" rule (the document that I pulled these stats from was created in 2004, and that's just the oldest surviving document I could find). I don't think that they do. Wild 8s give a noteworthy increase to your results, due to the greater ease of getting matched dice.

If you really want your character to be reliably good at something, you choose Extras that give a bonus to that Skill. For example, the Specialist
extra ("You are a specialist in your field of science") will give you a +3 bonus to a field of study such as astrophysics, botany, genetics, robotics, or zoology. Suddenly Mr Average Scientist is hitting the Hard difficulties over one-third of the time in stress situations.


6th-Mar-2009 01:35 am (UTC)
Okay, I stand corrected. Maybe we were just rolling badly. :)
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