I think the point
@Charlaquin was making (and I made up-thread) is that just because you can distinguish knowledge you have from knowledge your character has doesn't mean you are able to accurately make a decision for your character
as if he/she didn't have that knowledge. The human brain simply can't compartmentalize that way. The simple example I gave earlier is to imagine that you, the player, know the way to the treasure room. To avoid metagaming, you make your character go the other way. But if you didn't have that information, how do you know which way you would have chosen? You would have based the decision off of something else...a hunch, a clue from the DM, a guess, a habit of always choosing the lefthand passage, etc. The question, "What would I, the player, choose to do if I didn't know that information" is
impossible to answer accurately.
Now, maybe that's fine for the anti-metagaming rules you impose on yourself, but don't kid yourself that you are making a decision "as your character".