This hand-held chess machine endorsed by the New York Times offers all the advanced features of the larger table models. With over seventy strength levels and a beginners teaching mode both novice and seasoned players can enjoy the challenge of playing with this electronic chess set. Features: Hint option for coaching 500 checkmate problems for advanced training 73 strength levels Teaching mode for beginners Rates your level of play Selectable opening lines for play & learning Allows you to take back mistakes.