Aside from disagreeing about the implied lack of psychology in chess; you won't catch the Dragon playing e4, & I hate the QGA,
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I agree that psychology is an important element of bridge but it applies across the 4 categories; bidding, declarer, defence & ethics.
Bidding? The obvious first candidate is the psych! Although, the Weak NT can be devastating if you've only ever played SAYC, ;D.
Declarer? Declarer has a lot of psychological ploys, my favourite is the pseudo-squeeze,
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Defence? False-carding is bread & butter to a competent defender.
Ethics? Is tough, online there is no "stop" bid & you cannot see your opponents! It makes it easy to ignore unauthorised information from partner but things like "playing at an even tempo" are subject to the vagaries of the Net.