Holdem Strategy 3 - Deception
Poker is not just a mathematical game. It is also a game that entails a lot of psychological combat. Three of the most important psychological weapons in poker are bluffing, semi-bluffing, and slowplaying.
Bluffing
Bluffing is much more useful in a no-limit game than in a limit game. In a no-limit game, a player’s entire stack is at risk each hand. In a limit game, players know they can only lose so much if they call to the river.
Bluffing is almost useless in a low-stakes limit game (anything less than $2-$4). Rarely will a hand not be called to showdown, so there is no point in scaring people out of the pot. Bluffing becomes a much more powerful tool at high-limit games. When you play at a higher limit, it’s best to bluff when you ‘represent’ something and there are only one or two opponents in the pot. For example, betting at the flop with a high card on the board represents a pair, and raising with a flush draw out represents the flush.
Semi-Bluffing
Semi-bluffing is the name for bluffing when you also hold a drawing hand.
  Your Hand |
   Board |
You currently only have ace high, but you may hit a spade flush or make a pair of aces or kings. If you bet with this hand, you are bluffing, but you also have a high likelihood of gaining a strong hand on later betting rounds. Semi-bluffing can be a very useful technique, especially in no-limit games.