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Message: <blockquote data-quote="1Mac" data-source="post: 5848298" data-attributes="member: 48998">A way of slightly restating some of the points made above: We usually do not handle PC vs. NPC contests with two opposed rolls (and the fact that we do for most skill vs. skill checks is strange). Instead, we make one opposed check (from the PC or NPC, depending on the situation), vs. [the average d20 result] + [the modifier] for the other check. The average d20 result is 10.5, which is what we're really adding to the DC when we make these kind of checks.Adding 10.5 to the DC means there will never be a tie. It is a confusing modifier, though, so we have two choices to make it easier: round up to 11, and give the tie to the character actually rolling the d20, or round down to 10 and give the tie to the character who isn't rolling.Adding 10 is easier than adding 11, so we add 10 to things like AC and spell DCs* and say the tie goes to the "defender" (where "defender" is whoever has the static score to be beat by the character rolling the d20).*Actually lt looks like this isn't the case, at least in Pathfinder. But it should be <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" />.</blockquote>