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<blockquote data-quote="Patryn of Elvenshae" data-source="post: 5710197" data-attributes="member: 23094"><p>The "problem" with bell-curve distributions is that it makes ad-hoc bonus / penalty assignments (and the value of small, constant bonuses or penalties) a lot harder to judge.</p><p></p><p>Giving a +2 bonus to someone's Diplomacy check in a normal d20 regime results in a change in success rate of 10% (except at the very, very ends of the spectrum, which are rarely encountered).</p><p></p><p>Giving a +2 bonus to someone's Diplomacy check in a 2d10 regime is +15% chance of success if the original roll had to be 10 or better, vs. 5% if it had to be 5 or better, and if you had to originally roll a 13 then +2 is a +19% chance of success.</p><p></p><p>Going from a +2 to a +3 bonus is worth (in total) +21% chance of success if you originally had to roll a 10 (+6% over +2), +6% if you had to roll a 5 (you can't fail, now), and +28% if you originally had to roll a 13 (+9% over a +2 bonus).</p><p></p><p>Also, "5 or better" becomes the new "Don't roll a 1" which could be a little odd (e.g., both have about 5% chances of failure).</p><p></p><p>I say "problem" in quotes because it isn't <em>really</em> a problem, it's just a potentially unforseen difficulty or wrinkle.</p></blockquote><p></p>
[QUOTE="Patryn of Elvenshae, post: 5710197, member: 23094"] The "problem" with bell-curve distributions is that it makes ad-hoc bonus / penalty assignments (and the value of small, constant bonuses or penalties) a lot harder to judge. Giving a +2 bonus to someone's Diplomacy check in a normal d20 regime results in a change in success rate of 10% (except at the very, very ends of the spectrum, which are rarely encountered). Giving a +2 bonus to someone's Diplomacy check in a 2d10 regime is +15% chance of success if the original roll had to be 10 or better, vs. 5% if it had to be 5 or better, and if you had to originally roll a 13 then +2 is a +19% chance of success. Going from a +2 to a +3 bonus is worth (in total) +21% chance of success if you originally had to roll a 10 (+6% over +2), +6% if you had to roll a 5 (you can't fail, now), and +28% if you originally had to roll a 13 (+9% over a +2 bonus). Also, "5 or better" becomes the new "Don't roll a 1" which could be a little odd (e.g., both have about 5% chances of failure). I say "problem" in quotes because it isn't [I]really[/I] a problem, it's just a potentially unforseen difficulty or wrinkle. [/QUOTE]
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