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"the world's greatest mathematician and game theory expert goes heads up against the world's greatest behavioral psychologist / people reader. both have average skills in the other person's expertise, and both have a good understanding of poker. who has the edge, and how much is it?"

If you use perfect game theory and have no physical tells, no one can have an edge on you head up.

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This does not answer the question at all IMO. To employ perfect game theory you must be expert in both psychology/hand reading and mathematics. Neither player fits that profile. So for this hypothetical David's assumption that either player could employ perfect game theory is very unlikely.