<s>
Zappa	B-Application
,	O
Zap	B-Application
!	I-Application
Chess	I-Application
or	O
Zappa	B-Application
Mexico	O
,	O
is	O
a	O
UCI	B-General_Concept
chess	B-Application
engine	I-Application
written	O
by	O
Anthony	B-Application
Cozzie	I-Application
,	O
a	O
graduate	O
student	O
at	O
the	O
University	O
of	O
Illinois	O
at	O
Urbana-Champaign	O
.	O
</s>
<s>
Earlier	O
versions	O
of	O
Zappa	B-Application
are	O
free	O
(	O
though	O
not	O
open-source	B-Application
software	I-Application
)	O
and	O
the	O
current	O
version	O
(	O
Zappa	B-Application
Mexico	O
)	O
is	O
available	O
at	O
Shredder	B-Application
Computer	I-Application
Chess	I-Application
.	O
</s>
<s>
Zappa	B-Application
scored	O
an	O
upset	O
victory	O
at	O
the	O
World	O
Computer	O
Chess	O
Championship	O
in	O
August	O
,	O
2005	O
,	O
in	O
Reykjavík	O
,	O
Iceland	O
where	O
it	O
won	O
with	O
a	O
score	O
of	O
10	O
out	O
of	O
11	O
,	O
and	O
beat	O
both	O
Junior	B-Application
and	O
Shredder	B-Application
,	O
programs	O
that	O
had	O
won	O
the	O
championship	O
many	O
times	O
.	O
</s>
<s>
In	O
the	O
speed	O
chess	O
portion	O
of	O
the	O
tournament	O
Zappa	B-Application
placed	O
second	O
,	O
after	O
Shredder	B-Application
.	O
</s>
<s>
Zappa	B-Application
's	O
other	O
tournament	O
successes	O
include	O
winning	O
CCT7	O
on	O
the	O
Internet	O
Chess	O
Club	O
(	O
ICC	O
)	O
and	O
defeating	O
Grandmaster	O
Jaan	O
Ehlvest	O
3-1	O
.	O
</s>
<s>
In	O
Mexico	O
in	O
September	O
2007	O
Zappa	B-Application
won	O
a	O
match	O
against	O
Rybka	B-Application
by	O
a	O
score	O
of	O
5	O
-	O
4	O
.	O
</s>
<s>
For	O
some	O
time	O
,	O
Zappa	B-Application
was	O
considered	O
one	O
of	O
the	O
two	O
strongest	O
commercially	O
available	O
chess	B-Application
programs	I-Application
;	O
see	O
engine	O
rating	O
lists	O
like	O
CCRL	O
for	O
current	O
rankings	O
.	O
</s>
<s>
Some	O
speculate	O
that	O
Zappa	B-Application
's	O
more	O
efficient	O
SMP	B-Operating_System
parallel	O
search	O
could	O
make	O
it	O
stronger	O
on	O
enough	O
processors	O
.	O
</s>
<s>
In	O
March	O
2008	O
Anthony	B-Application
Cozzie	I-Application
announced	O
that	O
"	O
the	O
Zappa	B-Application
project	O
is	O
100%	O
finished	O
"	O
,	O
which	O
includes	O
both	O
tournaments	O
and	O
future	O
releases	O
.	O
</s>
<s>
In	O
June	O
2010	O
,	O
Zach	O
Wegner	O
announced	O
that	O
he	O
had	O
acquired	O
the	O
rights	O
to	O
maintain	O
and	O
improve	O
the	O
Zappa	B-Application
engine	O
.	O
</s>
<s>
The	O
improved	O
engine	O
competed	O
in	O
the	O
2010	O
WCCC	O
under	O
the	O
name	O
Rondo	O
,	O
achieving	O
second	O
place	O
behind	O
Rybka	B-Application
before	O
the	O
latter	O
's	O
disqualification	O
.	O
</s>
<s>
Immediately	O
after	O
the	O
successful	O
WCCC	O
2005	O
,	O
there	O
were	O
plans	O
to	O
commercialize	O
Zappa	B-Application
,	O
but	O
the	O
first	O
attempts	O
with	O
Vincent	O
Diepeveen	O
failed	O
.	O
</s>
<s>
In	O
April	O
2006	O
,	O
a	O
commercial	O
version	O
dubbed	O
Zap	B-Application
!	I-Application
Chess	I-Application
running	O
under	O
the	O
Fritz	O
GUI	O
was	O
released	O
by	O
ChessBase	O
.	O
</s>
<s>
The	O
version	O
of	O
Zappa	B-Application
that	O
won	O
the	O
Zappa-Rybka	O
match	O
,	O
Zappa	B-Application
Mexico	O
,	O
is	O
sold	O
by	O
Shredder	B-Application
Computer	I-Application
Chess	I-Application
,	O
is	O
compatible	O
with	O
Windows	O
and	O
Linux	B-Application
computers	O
with	O
up	O
to	O
512	O
CPU	O
cores	O
and	O
supports	O
multipv	O
analysis	O
and	O
Nalimov	O
tablebases	O
.	O
</s>
<s>
Despite	O
Zappa	B-Application
being	O
a	O
relative	O
newcomer	O
,	O
it	O
managed	O
to	O
win	O
the	O
tournament	O
and	O
in	O
general	O
caused	O
a	O
bit	O
of	O
a	O
stir	O
in	O
the	O
computer	O
chess	O
community	O
.	O
</s>
