[nanoCRUSHER]

[ QUOTE ]
Definition: Deception in poker, is the art of playing your hand in a manner which is contrary to that which maximizes your +EV, which in theory, increases your opponent(s) chances of misplaying their hand and returning your lost EV from the deceptive play and earning you additional +EV through the subsequent mistakes of your opponents.

[/ QUOTE ]

I voted for "worthless," and while it's not worthless, it belies a beginner's approach to poker.

If you slowplay all your big hands, after a given amount of time astute players will grasp onto this and stop betting into you. Conversely, if you always play trash hands fast, your opponents will again pick up on this and raise you when your fast-play.

Furthermore, when you play deceptively, sometimes playing your big hands fast can be deceptive to your opponent if you've played big hands slow and small hands fast because your opponent can't know whether you have a huge hand or two rags. Furthermore, if you've played tight thus far and you bet a weak hand expecting to win, you've deceived your opponent.

In summation, your definition is too specific. Your definition shows static thinking, which is good for low-limits but fails in higher limits. I'd suggest the following definition:

Deception: In poker, the act of playing hands in a random manner that your opponent's expectation of your hand value are different from you acual hand value and your opponent misplays his hand. [/definition]

This means sometimes slowplaying big hands, sometimes fastplaying big hands; similarly, it means sometimes check-folding weak hands and sometimes betting/check-raising weak hands.