Chess is not a sport, not by definition. Chess has the competitive part in droves, but there is no physical activity to be honed.
Here(below) Carlson plays at least 3 games of chess without moving anything, chess is played in the mind, not the body. Sports are played with the body(skeletal, muscles, joints).
I started chess one year ago and my biceps doubled in size. Also my back pain disappeared.
Chess is definitely a sport.
Logical moves and systems and patterns recognition