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<blockquote data-quote="cordell" data-source="post: 1737244" data-attributes="member: 21399">The bottom line is, to avoid a lot of re-rolls when trying to generate a non-standard number range, you have to do Math.&nbsp; The more Math you do, the fewer number of re-rolls there will be.If you need this for a one-time only situation, then its best just to roll d20 and re-roll 14 or higher.&nbsp; Defining the process will take longer than actually rolling a d20 six times.If you need to do this d13 on a regular basis, then define a process and write it down.&nbsp; Mine would be:Roll d100.&nbsp; reroll 99 and 00.&nbsp; Otherwise, divide by 6.&nbsp; Raise any fractions/decimals to the next highest integer.&nbsp; (This assumes you can divide by 6 in your head).01 thru 06 = 107 thru 14 = 2etc, etc.Why you might have a need for a d13 on a regular basis is beyond me.&nbsp; Maybe your regular gaming group includes 13 characters and you need to choose randomly quite often...(Now, if you want to really open a can of worms, try to convince a gamer that human beings cannot tell the difference between random/nonrandom number streams in a six-sided die rolled six times...)</blockquote>

[QUOTE="cordell, post: 1737244, member: 21399"] The bottom line is, to avoid a lot of re-rolls when trying to generate a non-standard number range, you have to do Math. The more Math you do, the fewer number of re-rolls there will be. If you need this for a one-time only situation, then its best just to roll d20 and re-roll 14 or higher. Defining the process will take longer than actually rolling a d20 six times. If you need to do this d13 on a regular basis, then define a process and write it down. Mine would be: Roll d100. reroll 99 and 00. Otherwise, divide by 6. Raise any fractions/decimals to the next highest integer. (This assumes you can divide by 6 in your head). 01 thru 06 = 1 07 thru 14 = 2 etc, etc. Why you might have a need for a d13 on a regular basis is beyond me. Maybe your regular gaming group includes 13 characters and you need to choose randomly quite often... (Now, if you want to really open a can of worms, try to convince a gamer that human beings cannot tell the difference between random/nonrandom number streams in a six-sided die rolled six times...) [/QUOTE]

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