I didn't use "tricks" at the time I played otb.
but Josh wrote about that some of his opponents used psychological tricks. such as tapping a chess piece against the table silently.
you cannot hear it because your brain registers it as extremely annoying.
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the only "trick" is rotating a queen in the hand if you are about to promote.
Share your tricks! I will probably never have an opportunity to play against you in real life so no worries about revealing some secrets. :)