Simple pop song (german text) about unsatisfied love, what else?

Somewhere in 1999 I used to go to my favourite pub for a late night chess play at the weekends. One day I noticed a beautiful girl standing alone at the bar. I fell (a bit) in love with her and considered to make a pass on her after the match, but when the chess game was over, she was gone. Neither bartender nor waitress knew her and in fact I never met her again. You can call it checkmate...