I need to find a suitable mechanic for rolling open-ended rolls using D20 and D10. Currently, the mechanic I use is as follows:
A] D20 Result
1 :Go to B
2-19 :Stop
20 :Go to C
B] D20 Result
1-10 :Stop, result is 1
11-19 :Stop, subtract 10, subtract from prior result (-1 to -9)
20 :Result is -10, go to D
C] D20 Result
1-10 :Stop, result is 20
11-19 :Stop, subtract 10, add to prior result (21 to 29)
20 :Result is 30, go to E
D] Repeat B
E] Repeat C
In other words, if the first roll is 1 or 20 roll again. If the second or subsequent roll is 1-10 stop rolling. If the second or subsequent roll is 11-19 then add/subtract 1-9 from the first roll and stop rolling. If the second or subsequent rolls is 20 then add/subtract 10 and roll again.
The problem with this method is that extreme rolls become very rare. Does anyone know of a better open-ended system that centers on the numbers 1-20? Thanks very much for any suggestions.
Brian Koppi
chikoppi@pipeline.com
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