<s>
Fairy-Max	B-Application
is	O
a	O
free	B-Application
and	O
open	O
source	O
chess	B-Application
engine	I-Application
which	O
can	O
play	O
orthodox	O
chess	B-Application
as	O
well	O
as	O
chess	B-Application
variants	O
.	O
</s>
<s>
Among	O
its	O
features	O
is	O
the	O
ability	O
of	O
users	O
to	O
define	O
and	O
use	O
their	O
own	O
custom	O
variant	O
chess	B-Application
pieces	O
for	O
use	O
in	O
games	O
.	O
</s>
<s>
Fairy-Max	B-Application
was	O
derived	O
from	O
micro-Max	O
(	O
also	O
developed	O
by	O
H.G.	O
</s>
<s>
Muller	O
)	O
,	O
one	O
of	O
the	O
smallest	O
programs	O
to	O
play	O
complete	O
FIDE	O
chess	B-Application
.	O
</s>
<s>
Therefore	O
,	O
Fairy-Max	B-Application
versioning	O
started	O
with	O
version	O
number	O
4.8	O
,	O
the	O
version	O
of	O
micro-Max	O
used	O
.	O
</s>
<s>
The	O
Fairy-Max	B-Application
module	O
is	O
a	O
chess	B-Application
engine	I-Application
only	O
,	O
but	O
is	O
packaged	O
with	O
WinBoard/XBoard	B-Application
,	O
which	O
serves	O
as	O
the	O
graphical	O
user	O
interface	O
.	O
</s>
<s>
Users	O
can	O
play	O
against	O
the	O
Fairy-Max	B-Application
engine	O
,	O
or	O
play	O
the	O
engine	O
against	O
other	O
engines	O
.	O
</s>
<s>
It	O
can	O
also	O
be	O
set	O
up	O
to	O
play	O
two	O
armies	O
against	O
each	O
other	O
,	O
both	O
using	O
the	O
Fairy-Max	B-Application
engine	O
,	O
for	O
the	O
purpose	O
of	O
analyzing	O
chess	B-Application
moves	O
,	O
chess	B-Application
variants	O
,	O
or	O
variant	O
chess	B-Application
pieces	O
.	O
</s>
<s>
Besides	O
classical	O
FIDE	O
chess	B-Application
,	O
Fairy-Max	B-Application
is	O
provided	O
with	O
a	O
large	O
selection	O
of	O
pre-defined	O
games	O
using	O
fairy	O
chess	B-Application
pieces	O
,	O
including	O
shatranj	O
(	O
ancient	O
Arabic	O
chess	B-Application
)	O
,	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
King	O
of	O
the	O
Hill	O
,	O
Capablanca	O
Chess	B-Application
,	O
Courier	O
chess	B-Application
,	O
Berolina	O
chess	B-Application
,	O
Seirawan	O
chess	B-Application
and	O
other	O
chess	B-Application
variants	O
.	O
</s>
<s>
Users	O
are	O
also	O
able	O
to	O
specify	O
their	O
own	O
board	O
sizes	O
,	O
and	O
define	O
custom	O
chess	B-Application
pieces	O
,	O
so	O
that	O
user-defined	O
chess	B-Application
variants	O
can	O
also	O
be	O
played	O
.	O
</s>
<s>
The	O
engine	O
's	O
Elo	O
rating	O
fluctuates	O
at	O
around	O
1900	O
when	O
playing	O
orthodox	O
chess	B-Application
in	O
CCRL	O
40/40	O
chess	B-Application
engine	I-Application
tournament	O
,	O
which	O
roughly	O
corresponds	O
to	O
class	O
A	O
human	O
player	O
.	O
</s>
<s>
The	O
author	O
of	O
the	O
program	O
has	O
said	O
"	O
the	O
goal	O
of	O
Fairy-Max	B-Application
is	O
to	O
make	O
an	O
entertaining	O
but	O
beatable	O
opponent	O
to	O
play	O
against	O
in	O
all	O
kind	O
of	O
chess	B-Application
variants.	O
"	O
</s>
