Many good point, Umbran, but it still doesn't help when the smart guy without he Int-dumped PC bluffs out the correct answer or otherwise doesn't RP within his PC's constraints. Even if you disallow his solution for THAT problem, he'll figure out this, that or the other and simply say it, and the party can act on his words.
It's especially a problem if you have other smart players who can pick up what the problem player is doing and run with it. (FWIW, i and several of the guys in my current group are very smart...but so far, nobody's been guilty of this behavior.)
As they say in the legal profession, you can't un-ring the bell.
It's especially a problem if you have other smart players who can pick up what the problem player is doing and run with it. (FWIW, i and several of the guys in my current group are very smart...but so far, nobody's been guilty of this behavior.)
As they say in the legal profession, you can't un-ring the bell.