Psychoanalytic speculations about play: tennis--the duel.
D000374:Aggression; D003163:Competitive Behavior; D005246:Feedback; D006167:Guilt; D006801:Humans; D007398:Interpersonal Relations; D010262:Paraphilic Disorders; D010988:Play and Playthings; D011573:Psychoanalytic Interpretation; D012801:Sibling Relations; D013177:Sports / Q000266:history; D013475:Superego