9 Photographic, optical, weighing, measuring and detecting apparatus; apparatus and instruments for digital chess board, namely, sensors for determining position of chess pieces; video cameras, digital audio and video recorders and players, microphones, pressure sensors, identity sensors, and vibration sensors; recorded and downloadable media, namely, audio and video recordings featuring chess; downloadable and recorded computer game software; downloadable mobile and computer applications in the fields of chess, chess players, and statistics relating to chess and chess players; downloadable augmented reality and virtual reality software; computers and computer peripheral devices; audiovisual apparatus, namely, augmented reality headset, virtual reality headsets, augmented reality glasses, virtual reality glasses; measuring equipment, namely, chess timers