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| Google's AI wins final Go challenge | Google's AI wins final Go challenge |
| (35 minutes later) | |
| 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 $1m 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" that the competition had ended. | |
| At a press conference held after the final match, Mr 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 Go, players take turn placing stones on a 19-by-19 grid, competing to take control of the most territory. | In 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. | The game is considered to be much more challenging for computers than chess. |
| Ahead of the final, China's top ranked Go player Ke Jie said he believed he could beat Google's AI. | |
| He told China Central Television: "In terms of probability, I have a chance to win, but the probability is not as high as I thought before. I think it is 60 per cent in favour of me." | |
| The five match challenge began in Seoul on 9 March, where AlphaGo scored its first victory. | 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 perfect game". | After losing the second match, Lee Se-dol said he was "speechless" adding that the AlphaGo machine played a "nearly perfect game". |
| In the third game commentators said that Lee Se-dol had brought his "top game" but that AlphaGo had won "in great style". | In the third game commentators said that Lee Se-dol had brought his "top game" but that AlphaGo had won "in great style". |
| Google's winning streak means it will pocket the $1m (£702,000) prize on offer. | Google's winning streak means it will pocket the $1m (£702,000) prize on offer. |
| But Lee Se-dol did win the fourth game, after which he said: "I've never been congratulated so much because I've won one game." | But Lee Se-dol did win the fourth game, after which he said: "I've never been congratulated so much because I've won one game." |
| The AlphaGo system was developed by British computer company DeepMind which was bought by Google in 2014. | The AlphaGo system was developed by British computer company DeepMind which was bought by Google in 2014. |
| It has built up its expertise by studying older games and teasing out patterns of play. | It has built up its expertise by studying older games and teasing out patterns of play. |
| Analysis by Dr Noel Sharkey, AI expert | Analysis by Dr Noel Sharkey, AI expert |
| To beat one of the world's top players, Deep Mind used a mixture of clever strategies to make the search much smaller. | To beat one of the world's top players, Deep Mind used a mixture of clever strategies to make the search much smaller. |
| Does this mean AI is now smarter than us and will kill us mere humans? Certainly not. | Does this mean AI is now smarter than us and will kill us mere humans? Certainly not. |
| AlphaGo doesn't care if it wins or loses. It doesn't even care if it plays and it certainly couldn't make you a cup of tea after the game. | AlphaGo doesn't care if it wins or loses. It doesn't even care if it plays and it certainly couldn't make you a cup of tea after the game. |
| Does it mean that AI will soon take your job? Possibly you should be more worried about that. | Does it mean that AI will soon take your job? Possibly you should be more worried about that. |
| What is Go? | What is Go? |
| Go is thought to date back to several thousand years ago in China. | Go is thought to date back to several thousand years ago in China. |
| Using black-and-white stones on a grid, players gain the upper hand by surrounding their opponents pieces with their own. | Using black-and-white stones on a grid, players gain the upper hand by surrounding their opponents pieces with their own. |
| The rules are simpler than those of chess, but a player typically has a choice of 200 moves, compared with about 20 in chess - there are more possible positions in Go than atoms in the universe, according to DeepMind's team. | The rules are simpler than those of chess, but a player typically has a choice of 200 moves, compared with about 20 in chess - there are more possible positions in Go than atoms in the universe, according to DeepMind's team. |
| It can be very difficult to determine who is winning, and many of the top human players rely on instinct. | It can be very difficult to determine who is winning, and many of the top human players rely on instinct. |