Chatbot Rose wins 2015's Loebner artificial intelligence prize
A chatbot named Rose has beaten three rivals in an artificial intelligence competition.
Judges - including the BBC's Rory Cellan-Jones - held conversations with the bots and humans and had to tell them apart.
Although Rose was judged to be the most convincing of the bots, the program did not fool the judges into thinking it was real.
So, the Loebner Prize in Artificial Intelligence's $100,000 (£64,380) jackpot remains unclaimed for another year.
Bruce Wilcox, the creator of Rose, spoke to the BBC shortly after the contest and suggested some of the questions the judges posed were not totally fair.