Raymond Chandler once wrote, “Chess is as elaborate a waste of human intelligence as you can find outside an advertising agency.” It is probably true that people who spend all of their time playing chess (and bridge) could make a more beneficial contribution to society at large by applying their minds elsewhere. Still, I doubt that Chandler objected to having his books advertised.
However, if you are going to play any game, you might as well spend that time concentrating on it to the exclusion of all else. So many contracts are easy to make or defeat if only the declarer or the defenders analyze the situation. For example, in today’s deal, South is in four spades. How should he plan the play after West leads the club queen?