Just in time for the Major League Baseball playoffs later this week, Strat-O-Matic Llc, one of the nation's largest producer of sports board and computer-fantasy games, operating out of a tiny, comfortably rumpled building in Glen Head, has come out with a new board game, the first in its 50-year history specifically for kids, the first also to be broadly sold on retail shelves, and its only new product this year.