A computer program has beaten a master Go player 3-0 in a best-of-five competition, in what is seen as a landmark moment for artificial intelligence.
Google's AlphaGo program was playing against Lee Se-dol in Seoul, in South Korea.
Mr Lee had been confident he would win before the competition started.
The Chinese board game is considered to be a much more complex challenge for a computer than chess.
"AlphaGo played consistently from beginning to the end while Lee, as he is only human, showed some mental vulnerability," one of Lee's former coaches, Kwon Kap-Yong, told the AFP news agency.
Mr Lee is considered a champion Go player, having won numerous professional tournaments in a long, successful career.
Go is a game of two players who take turns putting black or white stones on a 19-by-19 grid. Players win by surrounding their opponents pieces with their own.
In the first game of the series, AlphaGo triumphed by a very narrow margin - Mr Lee had led for most of the match, but AlphaGo managed to build up a strong lead in its closing stages.
sources
http://www.bbc.com/news/technology-35785875
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