Moves identified by 64 warning lights, under the played piece and under the destination square. Translucent pieces spreading light. Complete and progressive: 64 difficulty levels (including 5 beginners) divided into 4 different play games. Advanced: Elo 1800 player rating system. Touch-sensitive board stores piece placement when board is turned off. 2 players’ mode or player VS. computer mode. MULTIMOVE level to referee a game between 2 players. Knows the 50-move rule, “pat” and draw by repetition, pawn promotion, “en passant” capture. Solve the mate in 5 moves. TRAINING mode (improvement) indicating to the player whether the move just played is optimal or allowing the player to attempt a new move. Functions included: HINT to suggest a move, TAKE BACK can go back up to 2 moves, MOVE, VERIFY, SET UP. Age grade : 7 years and older Power supply : 3 x LR6/AA batteries (not included) or 9V 3000mA with positive direction adapter (not included)