Artificial intelligence: Go master Lee
Se-dol wins against AlphaGo program
13 March 2016
From
the section Technology
A master player of the game Go has won his
first match[1]
against a Google computer program, after losing three in a row in a
best-of-five competition.
Lee Se-dol, one of the world's top players,
said his win against AlphaGo was "invaluable".
The Chinese board game is considered to be
a much more complex challenge for a computer than chess, and AlphaGo's wins
were seen as a landmark[2]
moment for artificial intelligence.
A fifth game will be played on Tuesday.
Go is a game of two players who take turns
putting black or white stones on a 19-by-19 grid[3].
Players win by taking control of the most territory on the board.
Commentator[4]
Michael Redmond said AlphaGo had been playing well up until[5]
the middle of the game, but at move 78, Mr Lee played brilliantly[6].
Speaking after his victory, Mr Lee said:
"I've never been congratulated so much because I've won one game."
Google representatives[7]
said the defeat was "very valuable" for AlphaGo, as it identified a
problem which they could now try to fix.
In the first game of the series, AlphaGo
triumphed[8]
by a very narrow margin[9]
- Mr Lee had led for most of the match, but AlphaGo managed to build up a
strong lead in its closing stages.
After losing the second match to Deep Mind,
Lee Se-dol said he was "speechless[10]"
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".
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[11]
patterns of play.
DeepMind chief executive Demis Hassabis
said AlphaGo "played itself, different versions of itself, millions and
millions of times and each time got incrementally[12]
slightly better".
"It learns from its mistakes," he
told the BBC.
What is Go?
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.
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[13]
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[14].
Structure of the Lead：
WHO- A master player of the game Go
WHAT- has won his first match
WHEN- after losing three in a row in a
best-of-five competition
WHERE- not given
WHY- not given
HOW- not given
