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Do this, without becoming theatrical. If not, it will give you the clear idea that you are playing a meaningless and logical game, and that way it will be easier for opponents to be able to understand what you are trying to do.
Yeah, I forgot to add that you should look natural when you are doing a poker face because a bad one is a good tell that you are hiding something and makes you easy to predict. Another one I think you can do is play risky all the time but that is if you can handle the stress of playing risky.