Pokertard

At every table online there is always one person that bluffs indiscriminately. Bluffing is a tactic that needs to be used in context. That is, the bet has to make sense when considered with the preceding action and the strategic considerations (when playing tournaments).

The first consideration is who to bluff. For instance, in a tournament the size of the chipstacks relative to your own is paramount. A large stack is more likely to call the bluff because losing the hand won't cripple them; a small stack will have a much wider calling range because they're just looking for a decent hand to get their money in with and is willing to take the worst of it just to get lucky. In tournaments, it's best to go after the medium stacks. These players will be more likely to play tight and respect the gap concept (the theory that a player will only call with premium hands, but will raise with a wide range of cards). Frequently, they are just waiting for an opportunity to get their money in with a great hand and are willing to fold into a higher finishing position if they do not get that opportunity.

Additionally, it is critical to consider the number of players in the pot. Someone that bluffs into two or more players needs to have the table image to do so, and the nature of the online game does not permit much in the way of establishing this image. Best to run bluffs against a single player, because it is more likely someone will have enough of a hand to look you up when you have two or more opponents.

For more about the bluffing in Texas Hold 'em, read Harrington on Hold 'em Expert Strategy for No Limit Tournaments, Vol. 2: Endgame. I can also say for a fact that this strategy works great in the tournaments at Full Tilt Poker, where you can get a 100% deposit bonus.