Ah, I see. He changed his name:

http://www.youplay.it/play/User.Asp?UserID=StefanoZanotti#

Btw, not sure how to say this, but it is ... uh ... poor technique to use a changeable value as a key field. In this case, user ID should be numeric and unchangeable, while username ("zanotti" or whatever) should be a varchar, with a unique index if necessary. And this situation illustrates why.