I don`t want to start a discussion but for me as an long term chess club player chess is a sport! Not so physically as other sports, but believe me concentrating for max. 5 hours on a difficult position is challenging ;-) See this article regarding the DNMC Question. //en.wikipedia.org/wiki/Chess_Olympiad. I always been very seriously in deciding what fits the challenge but I agree it is often arguable.Thanks for all comments.