How would you describe your posture and demeanor in tournament chess?

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Do you sit up straight, slouch, or slump?  Are you fidgity? What is the expression on your face? Are you tense? Relaxed? Angry? Nervous? Scared? Impatient? Are you struggling to conceive of things or lucid and  focused? If you lose a face to face match, does it faze you? How much? How?