<s>
XBoard	B-Application
is	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
chessboard	O
for	O
chess	B-Application
engines	I-Application
under	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
It	O
is	O
developed	O
and	O
maintained	O
as	O
free	B-Application
software	I-Application
by	O
the	B-Application
GNU	I-Application
project	I-Application
.	O
</s>
<s>
WinBoard	B-Application
is	O
a	O
port	O
of	O
XBoard	B-Application
to	O
run	O
natively	O
on	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
Originally	O
developed	O
by	O
Tim	O
Mann	O
as	O
a	O
front	B-Architecture
end	I-Architecture
for	O
the	O
GNU	B-Application
Chess	I-Application
engine	B-Application
,	O
XBoard	B-Application
eventually	O
came	O
to	O
be	O
described	O
as	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
for	O
XBoard	B-Application
engines	O
.	O
</s>
<s>
It	O
also	O
acts	O
as	O
a	O
client	O
for	O
Internet	B-Application
Chess	I-Application
Servers	I-Application
,	O
and	O
e-mail	O
chess	B-Application
,	O
and	O
can	O
allow	O
the	O
user	O
to	O
play	O
through	O
saved	O
games	O
.	O
</s>
<s>
XBoard/WinBoard	O
remain	O
updated	O
,	O
and	O
the	O
Chess	B-Application
Engine	I-Application
Communication	O
Protocol	O
has	O
been	O
extended	O
to	O
meet	O
the	O
needs	O
of	O
modern	O
engines	O
(	O
which	O
have	O
features	O
such	O
as	O
hash	O
tables	O
,	O
multi-processing	O
and	O
end-game	O
tables	O
,	O
which	O
could	O
not	O
be	O
controlled	O
through	O
the	O
old	O
protocol	O
)	O
.	O
</s>
<s>
XBoard/WinBoard	O
also	O
fully	O
support	O
engines	O
that	O
play	O
chess	B-Application
variants	O
,	O
such	O
as	O
Fairy-Max	B-Application
.	O
</s>
<s>
This	O
means	O
the	O
GUI	B-Application
is	O
able	O
to	O
display	O
a	O
wide	O
range	O
of	O
variants	O
such	O
as	O
xiangqi	O
(	O
Chinese	O
chess	B-Application
)	O
,	O
shogi	O
(	O
Japanese	O
chess	B-Application
)	O
,	O
makruk	O
(	O
Thai	O
chess	B-Application
)	O
,	O
Crazyhouse	O
,	O
Capablanca	O
Chess	B-Application
and	O
many	O
other	O
Western	O
variants	O
on	O
boards	O
of	O
various	O
sizes	O
.	O
</s>
<s>
It	O
offers	O
a	O
Westernized	O
representation	O
for	O
these	O
games	O
,	O
but	O
the	O
almost	O
limitless	O
configurability	O
of	O
XBoard/WinBoard	O
also	O
allows	O
a	O
high-quality	O
representation	O
of	O
non-Western	O
style	O
games	O
.	O
</s>
<s>
Another	O
computer	B-Application
chess	I-Application
protocol	O
is	O
the	O
Universal	B-General_Concept
Chess	I-General_Concept
Interface	I-General_Concept
(	O
UCI	O
)	O
.	O
</s>
<s>
XBoard/WinBoard	O
supports	O
this	O
protocol	O
(	O
and	O
its	O
dialects	O
USI	O
and	O
UCCI	O
,	O
which	O
are	O
in	O
common	O
use	O
for	O
shogi	O
and	O
Chinese	O
chess	B-Application
)	O
through	O
adapter	O
programs	O
such	O
as	O
Polyglot	O
and	O
UCI2WB	O
.	O
</s>
<s>
Since	O
2014	O
there	O
exists	O
a	O
special	O
version	O
of	O
XBoard	B-Application
that	O
better	O
integrates	O
with	O
Apple	O
's	O
OS	B-Operating_System
X	I-Operating_System
.	O
</s>
<s>
It	O
is	O
distributed	O
from	O
WinBoard	B-Application
forum	O
as	O
an	O
OS	B-Operating_System
X	I-Operating_System
App	O
,	O
including	O
several	O
engines	O
(	O
for	O
chess	B-Application
and	O
many	O
chess	B-Application
variants	O
)	O
,	O
and	O
adapters	O
for	O
running	O
engines	O
in	O
non-natively	O
supported	O
protocols	O
.	O
</s>
<s>
It	O
also	O
contains	O
supporting	O
software	O
for	O
connecting	O
with	O
the	O
popular	O
Internet	B-Application
Chess	I-Application
Servers	I-Application
FICS	O
and	O
ICC	O
for	O
on-line	O
play	O
.	O
</s>
<s>
XBoard	B-Application
OS	B-Operating_System
X	I-Operating_System
Apps	O
that	O
specifically	O
configure	O
XBoard	B-Application
for	O
oriental-style	O
shogi	O
or	O
xiangqi	O
are	O
also	O
available	O
.	O
</s>
<s>
WinBoard	B-Application
is	O
a	O
version	O
of	O
XBoard	B-Application
adapted	O
to	O
MS	B-Application
Windows	I-Application
,	O
and	O
is	O
available	O
in	O
a	O
similar	O
package	O
.	O
</s>
