This is difficult to do and from my experience, those people that with extraordinary ability to control their emotions can only do this and often times they treat gambling as their career. If in a normal situation or other type of gambling games we can't control our emotion then being unpredicatable in poker is really impossible. Each of us has a 1 or 2 particular strategy that we follow in gambling, if we stick to that then in the long run our opponent will get used to it. To be unpredictable is to use different types of strategy as well as learning to be emotionless in different situations.