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An "average roll" of three six sided dice generates a total of 10.5; this makes an "average" skill check (a skill of 10, based on an unmodified attribute) equally likely to succeed or fail. Making statistic and skill checks in GURPS is the reverse of the mechanics of most other RPGs, where the higher the total of the die roll, the better.
Rolling dice (4d6, keep 3): This is the standard method since 3rd edition. [11] For each ability score, the player rolls 4d6 , and adds the three highest values, resulting in scores ranging from three to eighteen, skewed towards higher numbers, averaging 12.24, though the most probable result is 13.
For instance, 4d6−L means a roll of 4 six-sided dice, dropping the lowest result. This application skews the probability curve towards the higher numbers, as a result a roll of 3 can only occur when all four dice come up 1 (probability 1 / 1,296 ), while a roll of 18 results if any three dice are 6 (probability 21 / 1,296 ...
The same Good attribute would be considered Poor if you were to roll three minus sides and one blank. The same dice roll can be achieved with six-sided dice, treating a 1 or 2 as [−], a 3–4 as [ ] and a 5–6 as [+]. There are also several alternative dice systems available that use ten-sided dice, coins, or playing cards.
A very common notation, considered a standard, expresses a dice roll as nds or nDs, where n is the number of dice rolled and s is the number of sides on each die; if only one die is rolled, n is normally not shown. For example, d4 denotes one four-sided die; 6d8 means the player should roll six eight-sided dice and sum the results.
Dice towers have been used since at least the fourth century, in an attempt to ensure that dice roll outcomes were random. [1] The Vettweiss-Froitzheim Dice Tower is a surviving example, used by Romans in Germany; it has essentially the same design as modern examples, with internal baffles to force the dice to rotate more randomly.
For instance, F.A.T.A.L. uses a system of five attributes with four sub-attributes each, resulting in twenty total statistics to roll. This system was criticised for its complexity and for the lack of correlation between related sub-statistics, resulting in oddities such as a character with a higher Average Speech Rate than Maximum Speech Rate ...
Shadowrun (1989), designed by Bob Charrette, Paul Hume, and Tom Dowd, used a comparative dice pool, in which players roll a set of six-sided dice and each die rolled was compared to a target number to determine if that die was a success or a failure, with the number of successes determining the outcome of the action taken.