John DuBois watches victories on the board transform young lives Much like a knight on the many chessboards that have been distributed in South Texas schools, John DuBois is not a high-profile player. He prefers to hang back, quietly sliding left to right or jumping obstacles to ensure that the mission of the Optimist Coastal Bend Chess Federation is achieved - to help kids stay in school and improve their grades by teaching them an age-old game. "Chess is different than athletics in that with sports like basketball, for instance, you have only 10 players or so that really get...