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Message: <blockquote data-quote="sparxmith" data-source="post: 1595628" data-attributes="member: 14838">Last gaming session, the groups rules lawyer brought up an argument about concentration.  We play 3.5, and had been playing by the rule that if you are damaged in the turn that you cast a spell you had to make a concentration check 10 + spell level + damage dealt to be able to cast the spell.  An exampleRogue Bill attacks first, initiative count 20.  He moves forward and attacks Wizard Tim with a rapier.  He hits, and because Wizard Tim is flat-footed, adds sneak attack damage.  1d6 + 1 + 1d6 = appx 8 pts of damage.Wizard Tim, acting next on count 17, wants to cast a spell, magic missile, at Rogue Bill.  To do so, he must first succeed on a concentration check of 19.Now, I'm not the DM of this game, I just happen to be the only member of the group who like to post on message boards--so I got stuck with the question.  I just re-read the rule on concentration both in 3.0 and 3.5, and I no longer believe that our rule is correct.  I believe the rules lawyer is correct.  His argument is that you must succeed on a concentration check when someone interupts your spell casting--with an AoO, readied action, etc.  Looking at the above example, I figure that if Wizard Tim is first level, and has a constitution of 12, he has about a 30% chance of succeeding on this check, which really doesn't seem right.  (He succeeds on a die role of 14, not very good odds.)What's the correct ruling?  I'll report it back to the DM for next session.Thanx,Sparxmith</blockquote>

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