<s>
Naum	B-Application
is	O
a	O
computer	B-Application
chess	I-Application
engine	B-Application
by	O
Canadian	O
programmer	B-Application
Aleksandar	O
Naumov	O
.	O
</s>
<s>
The	O
last	O
commercial	B-Application
version	O
(	O
4.2	O
)	O
was	O
released	O
in	O
March	O
2010	O
.	O
</s>
<s>
The	O
program	O
supports	O
both	O
UCI	B-General_Concept
and	O
Winboard	B-Application
protocols	O
and	O
can	O
therefore	O
be	O
operated	O
under	O
different	O
graphical	O
interfaces	O
.	O
</s>
<s>
Naum	B-Application
has	O
commercial	B-Application
versions	O
for	O
single	O
and	O
multiple-processor	O
systems	O
,	O
a	O
freeware	O
version	O
(	O
2.0	O
,	O
released	O
September	O
2006	O
)	O
for	O
single-processor	O
systems	O
,	O
and	O
a	O
version	O
for	O
Palm	B-Operating_System
OS	I-Operating_System
(	O
1.8	O
,	O
released	O
in	O
June	O
2006	O
)	O
.	O
</s>
<s>
After	O
Naum	B-Application
tied	O
for	O
first	O
with	O
Rybka	B-Application
in	O
the	O
2008	O
Internet	O
Computer	B-Application
Chess	I-Application
Tournament	O
,	O
it	O
did	O
not	O
compete	O
in	O
any	O
other	O
over-the-board	O
(	O
OTB	O
)	O
tournaments	O
.	O
</s>
<s>
In	O
early	O
2009	O
,	O
Naum	B-Application
attained	O
second	O
place	O
behind	O
Rybka	B-Application
on	O
chess	B-Application
engine	I-Application
rating	O
lists	O
,	O
such	O
as	O
CCRL	O
In	O
2012	O
,	O
the	O
development	O
of	O
Naum	B-Application
was	O
discontinued	O
,	O
and	O
it	O
has	O
since	O
only	O
had	O
minor	O
updates	O
.	O
</s>
<s>
In	O
2013	O
,	O
Naum	B-Application
participated	O
in	O
the	O
Thoresen	O
Chess	B-Application
Engines	I-Application
Competition	O
and	O
the	O
author	O
released	O
a	O
software	O
patch	O
to	O
enable	O
the	O
engine	B-Application
to	O
run	O
stably	O
with	O
16	O
processors	O
.	O
</s>
