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Message: <blockquote data-quote="Drawmack" data-source="post: 513029" data-attributes="member: 4981">I would not recomend using 2d10 instead of 1d20 for two reasons.1) When selecting a DC it is very simply to calculat success ratio. (21 - Roll needed) * 5 = % chance of success. Makes designing adventures easy.2) Drastic alteration to game balance. The rules were deisned with a d20 in mind not 2d10s when you use 2d10s you are changing the entire balance scenrio of the game. Also you could be doing away with critical failure and if you do not then you affect game balance even more drastically. Let's take a look at it from a statistical point of view.When you roll two dice and add them together you begin to represent a bell curve. This anamoly happens because of the number of combinations that can make any given number.When you take the set of possible results from adding 2d10 together it is 20, if you take the roll of 0,1 as a 1 and the roll of 0,0 as a 20. We will assume this for all future calculations since it is accepted practice to make 00 = 100 and 01 = 1 when using 2d10 for precentile rolls.  You have 100 (10*10) possible rolls and only 20 possible out comes. However the number of combinations that make any given number are not equal which is where the bell curve representation comes from.Variablesx = size of die (4,6,8,10,12,20)y = target numbern = number of rolls that gives any result.m = number of dice rolled.I do not know the general formula but the formula for this particular is isy < 11; 1  + yy = 11; 8y > 10; 1 + (20 - y)The anamoly at 11 happens because we steal 2 11s to make 1s. So the odds of beating a given DC become very difficult to calculate and therefor a fair challenge becomes difficult to design. The benefit gained is very small for the complexity added therefor sticking with 1d20 is a better alternative then 2d10.[/color]</blockquote>

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