Starting with his jump from the Oshawa Generals to the NHL's Boston Bruins, Sports Illustrated began in-depth coverage of the career of Bobby Orr, a player who remains, over thirty years after his retirement, one of the greatest hockey players of all time.      Orr completely changed the way hockey was played, taking it from a game of grinding defence to a rushing, high-scoring affair. Along the way, Orr set scoring records, won individual awards, and led his Bruins to two Stanley Cups before a bad knee began costing him games. He tried two major comebacks in the late seventies, showing a perseverance and dedication unmatched in the game, but ultimately was forced into an early retirement at the age of thirty. Number Four, Bobby Orr brings together the stories and photographs behind the career. The media-shy Orr rarely opened up to reporters, hiding his charitable works and his loyalty to his friends and teammates and letting his play speak for itself. This anthology brings together all SI's reporting on Orr, from the 1960s to his new career as a player agent in the 2000s, to form a comprehensive biography of one of the greats of the game.