Know-it-alls (CSC)

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: Four times during the game session, Rudy has informed the DM that the rules either don't reflect reality or that if the DM knew what he knew on the subject, the DM would obviously make a different decision. Each time, the subject was different and the player felt obliged to clarify the subject matter for all involved.
The expert (which we discussed above) and the know-it-all are two very closely related species of gamer. Chances are that the latter type of player does know his material, but the difference between them is that this fellow, the know-it-all, is very interested in letting people know that he knows more than they do and delights in the attention he gets when all eyes are focused on him.
The know-it-all is more a problem than the expert, since he has an opinion on everything. While he may not directly challenge the DM's authority, he often wants to play his character in light of his own knowledge.
Again, as with the expert, the DM should inform the player that he should role-play the character as if he did not possess the knowledge. If this does not do it, enforce the decision. Don't allow the player's character to use knowledge he would not normally know.
Furthermore, the DM should admit that although he may not have as much information on the subject as the player, his decisions are based on the rules of the game and will stand unless their is unilateral player support for any rule variants.