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<blockquote data-quote="nightwyrm" data-source="post: 5326638" data-attributes="member: 75542">The use of the O/G/A system is precisely why Alternity uses a roll under system. Sure, mathematically, the chance of rolling 4 or less is the same as rolling 17 or higher, but there is an additional calculation step involved in using a roll higher system. Say you have a skill score of 16, to find the target &quot;roll equal or under&quot; number for G and A results, you simply divide the score by 2 and 4 respectively to get 8 and 4. To obtain a &quot;roll equal or higher&quot; target number, you must then subtract those numbers from 21 to get the O/G/A targets of 5/13/17. Not a big deal with a single skill, but Alternity has almost a hundred different skills, each with its own score.&nbsp;Also, there are increases in skill scores as a char levels up. You can purchase additional skill ranks.&nbsp;Of coures, there's also the thing where in a &quot;roll equal or higher&quot; system, your target OGA numbers gets lower as your skill improves.&nbsp;&nbsp;d20 system works well with &quot;roll higher&quot; because the number on your character sheet is the modifier which you add to your roll and your DM determines the target number.&nbsp; In Alternity, the number on your char sheet are the target numbers while your DM determines your modifier.</blockquote>

[QUOTE="nightwyrm, post: 5326638, member: 75542"] The use of the O/G/A system is precisely why Alternity uses a roll under system. Sure, mathematically, the chance of rolling 4 or less is the same as rolling 17 or higher, but there is an additional calculation step involved in using a roll higher system. Say you have a skill score of 16, to find the target "roll equal or under" number for G and A results, you simply divide the score by 2 and 4 respectively to get 8 and 4. To obtain a "roll equal or higher" target number, you must then subtract those numbers from 21 to get the O/G/A targets of 5/13/17. Not a big deal with a single skill, but Alternity has almost a hundred different skills, each with its own score. Also, there are increases in skill scores as a char levels up. You can purchase additional skill ranks. Of coures, there's also the thing where in a "roll equal or higher" system, your target OGA numbers gets lower as your skill improves. d20 system works well with "roll higher" because the number on your character sheet is the modifier which you add to your roll and your DM determines the target number. In Alternity, the number on your char sheet are the target numbers while your DM determines your modifier. [/QUOTE]

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