<s>
Crazy	B-Application
Stone	I-Application
(	O
Champion	B-Application
Go	I-Application
on	O
iOS	B-Application
and	O
Android	B-Application
platforms	I-Application
)	O
is	O
a	O
Go	O
playing	O
engine	O
,	O
developed	O
by	O
Rémi	O
Coulom	O
,	O
a	O
French	O
computer	O
scientist	O
.	O
</s>
<s>
It	O
is	O
one	O
of	O
the	O
first	O
computer	B-Application
Go	I-Application
programs	O
to	O
utilize	O
a	O
modern	O
variant	O
of	O
the	O
Monte	B-Application
Carlo	I-Application
tree	I-Application
search	I-Application
.	O
</s>
<s>
It	O
is	O
part	O
of	O
the	O
Computer	B-Application
Go	I-Application
effort	O
.	O
</s>
<s>
In	O
January	O
2012	O
Crazy	B-Application
Stone	I-Application
was	O
rated	O
as	O
5	O
dan	O
on	O
KGS	B-Application
,	O
in	O
March	O
2014	O
as	O
6	O
dan	O
.	O
</s>
<s>
Coulom	O
began	O
writing	O
Crazy	B-Application
Stone	I-Application
in	O
July	O
2005	O
,	O
and	O
at	O
the	O
outset	O
incorporated	O
the	O
Monte	O
Carlo	O
algorithm	O
in	O
its	O
design	O
.	O
</s>
<s>
Pattern	O
recognition	O
and	O
searching	O
was	O
added	O
in	O
2006	O
,	O
and	O
later	O
that	O
year	O
Crazy	B-Application
Stone	I-Application
took	O
part	O
in	O
its	O
first	O
tournament	O
,	O
winning	O
a	O
gold	O
medal	O
in	O
the	O
9x9	O
competition	O
at	O
the	O
11th	O
Computer	O
Olympiad	O
.	O
</s>
<s>
However	O
,	O
Crazy	B-Application
Stone	I-Application
's	O
most	O
significant	O
accomplishment	O
was	O
to	O
defeat	O
Kaori	O
Aoba	O
,	O
a	O
professional	O
Japanese	O
4	O
dan	O
,	O
in	O
an	O
8-stone	O
handicap	O
match	O
in	O
2008	O
.	O
</s>
<s>
Three	O
months	O
later	O
,	O
on	O
12	O
December	O
2008	O
,	O
Crazy	B-Application
Stone	I-Application
defeated	O
Aoba	O
again	O
in	O
a	O
7-stone	O
match	O
.	O
</s>
<s>
In	O
March	O
2013	O
,	O
Crazy	B-Application
Stone	I-Application
beat	O
Yoshio	O
Ishida	O
,	O
Japanese	O
9-dan	O
former	O
Honinbo	O
Meijin	O
,	O
in	O
a	O
19×19	O
game	O
with	O
four	O
handicap	O
stones	O
.	O
</s>
<s>
On	O
March	O
21	O
,	O
2014	O
,	O
at	O
the	O
second	O
annual	O
Densei-sen	O
competition	O
,	O
Crazy	B-Application
Stone	I-Application
defeated	O
Norimoto	O
Yoda	O
,	O
Japanese	O
professional	O
9-dan	O
,	O
in	O
a	O
19x19	O
game	O
with	O
four	O
handicap	O
stones	O
by	O
a	O
margin	O
of	O
2.5	O
points	O
.	O
</s>
<s>
02/12/2007	O
-	O
Won	O
the	O
first	O
Computer	B-Application
Go	I-Application
UEC	O
Cup	O
.	O
</s>
<s>
14/12/2008	O
-	O
Won	O
the	O
second	O
Computer	B-Application
Go	I-Application
UEC	O
Cup	O
.	O
</s>
<s>
29/11/2009	O
-	O
Finished	O
9th	O
in	O
the	O
third	O
Computer	B-Application
Go	I-Application
UEC	O
Cup	O
.	O
</s>
