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Poker face and make it looks natural, that's truly hard to predict what encircling inside your minds.
Lots of gamblers practice this and make it realistic, they use this skills to take advantage with those gamblers who played against them,
if you able to practice this and managed to make it more realistic from time to time, you really got the opportunities to collect winning stats each time you made a call.
Besides the traditional poker face, aspiring pro poker players, mind games can be a good way to make things much more complicated for your opponents because they will be second guessing everytime since you employ two kinds of mind games.