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*Pathfinder & Starfinder
D20 vs 2D10
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<blockquote data-quote="swrushing" data-source="post: 1293422" data-attributes="member: 14140"><p>Let me take a crack at this...</p><p></p><p>whether you roll 2d10 or 1d20 is not going to change anything towards making the RESULTS of the action more or less likely. Sure, the 2d10 will roll 8-14 58% of the time while a 1d20 will roll the same numbers 35% of the time, but the factor then applied is "what does 8-14 mean" in terms of success and failure?</p><p></p><p>If i want a given task to succeed 25% of the time when the guy has +X skill at it, i will assign a DC wqhich means 25% of the die roll results fall in there. if the skill is +5, then i will assign a Dc of 21 for 1d20 and a DC of 19-20 for 2d10 (21%-28%.)</p><p></p><p>Changing the die rolls does not affect the probabilities of the results, unless you just ignore the DC changes that should accompany the shift in die rolls. if you do that, then you are buying a ton of basically random shifts in DCs you probably never had a problem with before.</p><p></p><p>It would be MUCH MUCH easier to just go thru and adjust the DCs you dont like and keep the very manageable and understandable 1d20.</p><p></p><p>By far the biggest problem with 2d10 or any multidie roll is that adjustments become variable in impact. if i say rain is causing a -2, the for some people that means rain is costing them 19 rolls out of 100, almos 20% but for others it is costing them only 9 rolls out of 100. Moreover, who gets 19 and who gets 9 is not readily obvious... its not "the skilled guys lose less" or even "the skilled guys lose more" its who is farthest from the "need a 10" crowd lose less. This applies of course to Dc assignment too. A Dc +5 higher might mean 54 fewewr rolls succeed out of 100 or it might mean 20 fewer rolls out of 100.</p><p></p><p>For me, I can take a flat d20, know every +1 is 5% and set the DCs based on knowing that each +1 DC or +1 modifier is adjusting the odds by 1 in 20 and then I know what i am doing. if i want the guys with moderate rolls to succeed more, say 60% vs 35%, i lower the Dc so that they will succeed on a roll of 9+, 60%.</p><p></p><p>2d10 is just d100 with uneven mapping of roll to result. 3d6 is just d216 with even more uneven apping between die roll and result. its the decision of "what rolls equate to success and failure" that then gives these systems the feel of more predictability. You can get that predictability without the uneven modifiers by just adjusting your DCs with flat d20.</p></blockquote><p></p>
[QUOTE="swrushing, post: 1293422, member: 14140"] Let me take a crack at this... whether you roll 2d10 or 1d20 is not going to change anything towards making the RESULTS of the action more or less likely. Sure, the 2d10 will roll 8-14 58% of the time while a 1d20 will roll the same numbers 35% of the time, but the factor then applied is "what does 8-14 mean" in terms of success and failure? If i want a given task to succeed 25% of the time when the guy has +X skill at it, i will assign a DC wqhich means 25% of the die roll results fall in there. if the skill is +5, then i will assign a Dc of 21 for 1d20 and a DC of 19-20 for 2d10 (21%-28%.) Changing the die rolls does not affect the probabilities of the results, unless you just ignore the DC changes that should accompany the shift in die rolls. if you do that, then you are buying a ton of basically random shifts in DCs you probably never had a problem with before. It would be MUCH MUCH easier to just go thru and adjust the DCs you dont like and keep the very manageable and understandable 1d20. By far the biggest problem with 2d10 or any multidie roll is that adjustments become variable in impact. if i say rain is causing a -2, the for some people that means rain is costing them 19 rolls out of 100, almos 20% but for others it is costing them only 9 rolls out of 100. Moreover, who gets 19 and who gets 9 is not readily obvious... its not "the skilled guys lose less" or even "the skilled guys lose more" its who is farthest from the "need a 10" crowd lose less. This applies of course to Dc assignment too. A Dc +5 higher might mean 54 fewewr rolls succeed out of 100 or it might mean 20 fewer rolls out of 100. For me, I can take a flat d20, know every +1 is 5% and set the DCs based on knowing that each +1 DC or +1 modifier is adjusting the odds by 1 in 20 and then I know what i am doing. if i want the guys with moderate rolls to succeed more, say 60% vs 35%, i lower the Dc so that they will succeed on a roll of 9+, 60%. 2d10 is just d100 with uneven mapping of roll to result. 3d6 is just d216 with even more uneven apping between die roll and result. its the decision of "what rolls equate to success and failure" that then gives these systems the feel of more predictability. You can get that predictability without the uneven modifiers by just adjusting your DCs with flat d20. [/QUOTE]
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