I don't understand how it can possibly select the "worst piece". As far as I've always believed, Tetris is np complete. Now I understand that in very simple ter

I don't understand how it can possibly select the "worst piece". As far as I've always believed, Tetris is np complete. Now I understand that in very simple terms you could say for one move that a piece looks difficult, but in the long run it could turn to have been a a great piece.