<s>
Deep	B-General_Concept
Thought	I-General_Concept
was	O
a	O
computer	O
designed	O
to	O
play	O
chess	B-Application
.	O
</s>
<s>
Deep	B-General_Concept
Thought	I-General_Concept
was	O
initially	O
developed	O
at	O
Carnegie	O
Mellon	O
University	O
and	O
later	O
at	O
IBM	O
.	O
</s>
<s>
It	O
was	O
second	O
in	O
the	O
line	O
of	O
chess	B-Application
computers	I-Application
developed	O
by	O
Feng-hsiung	O
Hsu	O
,	O
starting	O
with	O
ChipTest	B-General_Concept
and	O
culminating	O
in	O
Deep	B-General_Concept
Blue	I-General_Concept
.	O
</s>
<s>
In	O
addition	O
to	O
Hsu	O
,	O
the	O
Deep	B-General_Concept
Thought	I-General_Concept
team	O
included	O
Thomas	O
Anantharaman	O
,	O
Mike	O
Browne	O
,	O
Murray	O
Campbell	O
and	O
Andreas	O
Nowatzyk	O
.	O
</s>
<s>
Deep	B-General_Concept
Thought	I-General_Concept
became	O
the	O
first	O
computer	O
to	O
beat	O
a	O
grandmaster	O
in	O
a	O
regular	O
tournament	O
game	O
when	O
it	O
beat	O
Bent	O
Larsen	O
in	O
1988	O
,	O
but	O
was	O
easily	O
defeated	O
in	O
both	O
games	O
of	O
a	O
two-game	O
match	O
with	O
Garry	O
Kasparov	O
in	O
1989	O
as	O
well	O
as	O
in	O
a	O
correspondence	O
match	O
with	O
Michael	O
Valvo	O
.	O
</s>
<s>
It	O
was	O
named	O
after	O
Deep	B-General_Concept
Thought	I-General_Concept
,	O
a	O
fictional	O
computer	O
in	O
Douglas	O
Adams	O
 '	O
series	O
,	O
The	B-Application
Hitchhiker	I-Application
's	I-Application
Guide	I-Application
to	I-Application
the	I-Application
Galaxy	I-Application
.	O
</s>
<s>
The	O
naming	O
of	O
chess	B-Application
computers	I-Application
has	O
continued	O
in	O
this	O
vein	O
with	O
Deep	B-General_Concept
Blue	I-General_Concept
,	O
Deep	B-Application
Fritz	I-Application
,	O
Deep	B-Application
Junior	I-Application
,	O
etc	O
.	O
</s>
<s>
Deep	B-General_Concept
Thought	I-General_Concept
won	O
the	O
North	O
American	O
Computer	B-Application
Chess	I-Application
Championship	O
in	O
1988	O
and	O
the	O
World	O
Computer	B-Application
Chess	I-Application
Championship	O
in	O
the	O
year	O
1989	O
,	O
and	O
its	O
rating	O
,	O
according	O
to	O
the	O
USCF	O
was	O
2551	O
.	O
</s>
<s>
In	O
1994	O
,	O
Deep	B-General_Concept
Thought	I-General_Concept
2	O
won	O
the	O
North	O
American	O
Computer	B-Application
Chess	I-Application
Championship	O
for	O
the	O
fifth	O
time	O
,	O
with	O
its	O
rating	O
estimated	O
at	O
around	O
2600	O
.	O
</s>
<s>
Some	O
engineers	O
who	O
designed	O
Deep	B-General_Concept
Thought	I-General_Concept
also	O
worked	O
in	O
the	O
design	O
of	O
Deep	B-General_Concept
Thought	I-General_Concept
2	O
.	O
</s>
<s>
Its	O
algorithms	O
were	O
quite	O
simple	O
evaluation	O
functions	O
,	O
but	O
it	O
could	O
examine	O
half	O
a	O
billion	O
chess	B-Application
positions	O
per	O
move	O
in	O
tournament	O
games	O
,	O
which	O
is	O
sufficient	O
to	O
reach	O
depth	O
of	O
10	O
or	O
11	O
moves	O
ahead	O
in	O
complex	O
positions	O
.	O
</s>
<s>
Despite	O
that	O
,	O
using	O
the	O
technique	O
of	O
singular	O
extensions	O
it	O
could	O
also	O
follow	O
lines	O
of	O
forced	O
moves	O
that	O
reach	O
even	O
further	O
,	O
which	O
is	O
how	O
it	O
once	O
found	O
a	O
checkmate	B-Application
in	O
18	O
moves	O
.	O
</s>
