<s>
AlphaGo	B-Application
versus	I-Application
Fan	I-Application
Hui	I-Application
was	O
a	O
five-game	O
Go	O
match	O
between	O
European	O
champion	O
Fan	O
Hui	O
,	O
a	O
2-dan	O
(	O
out	O
of	O
9	O
dan	O
possible	O
)	O
professional	O
,	O
and	O
AlphaGo	B-Application
,	O
a	O
computer	B-Application
Go	I-Application
program	O
developed	O
by	O
DeepMind	B-Application
,	O
held	O
at	O
DeepMind	B-Application
's	O
headquarters	O
in	O
London	O
in	O
October	O
2015	O
.	O
</s>
<s>
AlphaGo	B-Application
won	O
all	O
five	O
games	O
.	O
</s>
<s>
This	O
was	O
the	O
first	O
time	O
a	O
computer	B-Application
Go	I-Application
program	O
had	O
beaten	O
a	O
professional	O
human	O
player	O
on	O
a	O
full-sized	O
board	O
without	O
handicap	O
.	O
</s>
<s>
This	O
match	O
was	O
not	O
disclosed	O
to	O
the	O
public	O
until	O
27	O
January	O
2016	O
to	O
coincide	O
with	O
the	O
publication	O
of	O
a	O
paper	O
in	O
the	O
journal	O
Nature	O
describing	O
the	O
algorithms	O
AlphaGo	B-Application
used	O
.	O
</s>
<s>
I	O
know	O
AlphaGo	B-Application
is	O
a	O
computer	O
,	O
but	O
if	O
no	O
one	O
told	O
me	O
,	O
maybe	O
I	O
would	O
think	O
the	O
player	O
was	O
a	O
little	O
strange	O
,	O
but	O
a	O
very	O
strong	O
player	O
,	O
a	O
real	O
person.	O
"	O
</s>
<s>
In	O
this	O
match	O
,	O
DeepMind	B-Application
used	O
AlphaGo	B-Application
's	O
distributed	O
version	O
with	O
1,202	O
CPUs	B-General_Concept
and	O
176	O
GPUs	B-Architecture
with	O
Elo	O
rating	O
3,144	O
.	O
</s>
<s>
During	O
this	O
match	O
,	O
AlphaGo	B-Application
and	O
Fan	O
Hui	O
also	O
played	O
another	O
five	O
informal	O
games	O
with	O
shorter	O
time	O
control	O
(	O
each	O
player	O
having	O
just	O
three	O
30-second	O
byo-yomi	O
)	O
and	O
AlphaGo	B-Application
defeated	O
Fan	O
by	O
three	O
to	O
two	O
.	O
</s>
<s>
Fan	O
Hui	O
(	O
black	O
)	O
v	O
.	O
AlphaGo	B-Application
(	O
white	O
)	O
,	O
5	O
October	O
2015	O
,	O
AlphaGo	B-Application
won	O
by	O
2.5	O
points	O
.	O
</s>
<s>
AlphaGo	B-Application
(	O
black	O
)	O
v	O
.	O
Fan	O
Hui	O
(	O
white	O
)	O
,	O
6	O
October	O
2015	O
,	O
AlphaGo	B-Application
won	O
by	O
resignation	O
.	O
</s>
<s>
Although	O
the	O
white	O
stones	O
at	O
the	O
lower-left	O
corner	O
could	O
have	O
been	O
captured	O
if	O
black	O
135	O
had	O
been	O
placed	O
at	O
"	O
a	O
"	O
,	O
AlphaGo	B-Application
's	O
choice	O
might	O
be	O
safer	O
to	O
win	O
.	O
</s>
<s>
Fan	O
Hui	O
(	O
black	O
)	O
v	O
.	O
AlphaGo	B-Application
(	O
white	O
)	O
,	O
7	O
October	O
2015	O
,	O
AlphaGo	B-Application
won	O
by	O
resignation	O
.	O
</s>
<s>
AlphaGo	B-Application
(	O
black	O
)	O
v	O
.	O
Fan	O
Hui	O
(	O
white	O
)	O
,	O
8	O
October	O
2015	O
,	O
AlphaGo	B-Application
won	O
by	O
resignation	O
.	O
</s>
<s>
Fan	O
Hui	O
(	O
black	O
)	O
v	O
.	O
AlphaGo	B-Application
(	O
white	O
)	O
,	O
9	O
October	O
2015	O
,	O
AlphaGo	B-Application
won	O
by	O
resignation	O
.	O
</s>
<s>
AlphaGo	B-Application
's	O
victory	O
shocked	O
the	O
Go	O
community	O
.	O
</s>
<s>
Lee	O
Sedol	O
commented	O
that	O
AlphaGo	B-Application
reached	O
the	O
top	O
of	O
the	O
amateur	O
level	O
in	O
this	O
match	O
,	O
but	O
had	O
not	O
yet	O
reached	O
the	O
professional	O
level	O
,	O
and	O
he	O
could	O
give	O
AlphaGo	B-Application
one	O
or	O
two	O
stones	O
.	O
</s>
<s>
Ke	O
Jie	O
and	O
Mi	O
Yuting	O
thought	O
that	O
the	O
strength	O
of	O
AlphaGo	B-Application
in	O
this	O
match	O
was	O
equal	O
to	O
that	O
of	O
a	O
candidate	O
for	O
Go	O
professional	O
,	O
and	O
extremely	O
close	O
to	O
the	O
professional	O
level	O
,	O
while	O
Shi	O
Yue	O
thought	O
that	O
it	O
already	O
reached	O
the	O
professional	O
level	O
.	O
</s>
<s>
"	O
It	O
was	O
terrifying	O
,	O
"	O
said	O
Ke	O
Jie	O
,	O
"	O
that	O
AlphaGo	B-Application
could	O
learn	O
and	O
evolve	O
although	O
its	O
power	O
was	O
still	O
limited	O
then.	O
"	O
</s>
<s>
Canadian	O
AI	O
specialist	O
Jonathan	O
Schaeffer	O
,	O
comparing	O
AlphaGo	B-Application
with	O
a	O
"	O
child	O
prodigy	O
"	O
that	O
lacked	O
experience	O
,	O
considered	O
this	O
match	O
"	O
not	O
yet	O
a	O
Deep	O
Blue	O
moment	O
"	O
,	O
and	O
said	O
that	O
the	O
real	O
achievement	O
would	O
be	O
"	O
when	O
the	O
program	O
plays	O
a	O
player	O
in	O
the	O
true	O
top	O
echelon	O
"	O
.	O
</s>
