Quote Originally Posted by Koo Rehtorb View Post
The GM's objective is to try to "win" the encounter, with all of the resources available to the creatures they're using at the time. Intelligence is one of those resources. Doing less cheapens the experience. If your group isn't looking for that particular experience, play a different RPG.
I think a better way to word this, while keeping the same idea, would be: "In an encounter [if the GM's objective is to run a verisimilitudinous game] a GM should play NPCs such that they are always trying to 'win', to accomplish whatever goal they have, and use all available resources".

I hope I interpreted what you're saying correctly; I just think the "GM should try to 'win' an encounter" statement carries a meaning you didn't mean to communicate (namely, that the GM is looking to defeat the players).