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Message: <blockquote data-quote="El Mahdi" data-source="post: 6660072" data-attributes="member: 59506">Stacking advantage or disadvantage does increase (or decrease) the chances of the desired (or undesired) result; but the increase is not cumulative...it's a little less with each additional D20.It's kind of like walking towards a wall, but only walking half-way every time.  You'll keep getting closer to the wall, though you'll never actually reach it (at least until you get to planck distance<img src="http://www.enworld.org/forum/images/smilies/glasses.png"  class="smilie" loading="lazy" alt="B-)" title="Glasses    B-)" data-shortname="B-)" />), and each step will be smaller and smaller.I like the extra dice and let advantage and disadvantage stack in my games, but be warned that the level of complexity rises faster than the gains due to stacking do.  (more dice to roll meaning longer turns, for diminishing returns from stacking)So, I think the effective bonus for a target of 10 with advantage is about +5.  With double advantage (three D20's) it's something like +6.5/+7.  With four D20's (triple advantage) it's something like +8.  Five is something like +8.5, six +9, etc, etc.I don't know the exact numbers and can't find where others had already figured it out that far, though there are lots of places on the internet you can run the probabilities.  However, here are some links to some helpful sites/pages talking about this.<a href="http://www.enworld.org/forum/showthread.php?323667-Probability-question-Advantage-and-Disadvantage" target="_blank">http://www.enworld.org/forum/showthread.php?323667-Probability-question-Advantage-and-Disadvantage</a><a href="http://onlinedungeonmaster.com/2012/05/24/advantage-and-disadvantage-in-dd-next-the-math/" target="_blank">http://onlinedungeonmaster.com/2012/05/24/advantage-and-disadvantage-in-dd-next-the-math/</a><a href="http://www.tabletopterrors.com/2014/10/16/advantage-disadvantage-and-beyond-the-true-odds-of-extra-d20s-by-kerne-fahey/" target="_blank">http://www.tabletopterrors.com/2014/10/16/advantage-disadvantage-and-beyond-the-true-odds-of-extra-d20s-by-kerne-fahey/</a></blockquote>

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