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Google's AI wins final Go challenge

BBC Online
Google's DeepMind artificial intelligence has secured its fourth win over a master player, in the final of a five match challenge.
Lee Se-dol, one of the world's top Go players, won just one of the matches against the AlphaGo program, missing out on the $ 1 m prize up for grabs.
Demis Hassabis, founder of DeepMind, said the match had been the "most exciting and stressful" for his team. Lee Se-dol said he felt "regrettable" about the result of the contest.
I n Go, players take turn placing stones on a 19-by-19 grid, competing to take control of the most territory. The game is considered to be much more challenging for computers than chess.
At a press conference held after the final match, Lee said he did not necessarily think AlphaGo was superior to humans. But he said he had more studying to do, and admitted the matches had challenged some of his ideas about the game Go.
In some countries the people watch football on big screens in public squares, but in South Korea it's been the mighty challenge of machine against humanity.
And the victory of the computer has led to some introspection. One South Korean newspaper complained that the contest was "lopsided" with the single Korean pitted against the corporate might of Google and its "army of super-smart people armed with unfathomable computing power".
In a spirit of magnanimity, however, the Korea Baduk Association -which governs the game of Go - has decided to give an honorary ninth-dan ranking to AlphaGo.
The 4-1 mechanical victory has also made some Go players doubt themselves. The European champion who lost last year to AlphaGo said it had really knocked his selfconfidence, even as it enabled him to climb up the world rankings.
Go was invented about 2,500 years or so ago in China. Until now, it has always had a human best player. Not any more. The five match challenge began in Seoul on 9 March, where AlphaGo scored its first victory.
After losing the second match, Lee Se-dol said he was "speechless" adding that the AlphaGo machine played a “nearly peifect game". In the third game commentators said that Lee Se-dol had brought his "top game" but that AlphaGo had won "in great style".
DeepMind's winning streak meant it won the $lm (£702,000) prize on offer. Google said the money would be donated to Unicef, Stem (science, technology, engineering, and maths) charities and Go organisations.