chess with mozart

wolfgang von kempen´s famous chessmachine was a sensation in 1768 when he presented this chessturc to her empress marie theresia. till now it was not possible to find out who was the first person who conducted this machine from the inside of the chessturc. the college of pataphysique found recently a letter from a person who observed 12 yeras old mozart playing chess with wolfgang from kempen in the taronicafe a chessacafe in the center of vienna. was mozat the first turc who directed the machne from the inside ?

further information:
http://www.chessbase.de/spotlight/spotlight2.asp?id=11