<s>
ChessV	B-Application
(	O
short	O
for	O
Chess	B-Application
Variants	O
)	O
is	O
a	O
free	B-Application
computer	B-Application
program	I-Application
designed	O
to	O
play	O
many	O
chess	B-Application
variants	O
.	O
</s>
<s>
ChessV	B-Application
is	O
an	O
open-source	O
,	O
universal	O
chess	B-Application
variant	O
program	O
with	O
a	O
graphical	O
user-interface	O
,	O
sophisticated	O
AI	O
,	O
support	O
for	O
opening	O
books	O
and	O
other	O
features	O
of	O
traditional	O
chess	B-Application
programs	I-Application
.	O
</s>
<s>
The	O
developer	O
of	O
this	O
program	O
,	O
Gregory	O
Strong	O
,	O
has	O
been	O
adding	O
more	O
variants	O
with	O
each	O
release	O
of	O
ChessV	B-Application
.	O
</s>
<s>
Over	O
100	O
chess	B-Application
variants	O
are	O
supported	O
,	O
including	O
the	O
developer	O
's	O
few	O
own	O
variants	O
and	O
other	O
exotic	O
variants	O
,	O
and	O
can	O
be	O
programmed	O
to	O
play	O
additional	O
variants	O
.	O
</s>
<s>
ChessV	B-Application
is	O
designed	O
to	O
be	O
able	O
to	O
play	O
any	O
game	O
that	O
is	O
reasonably	O
similar	O
to	O
chess	B-Application
.	O
</s>
<s>
ChessV	B-Application
is	O
one	O
of	O
only	O
a	O
few	O
such	O
programs	O
that	O
exist	O
.	O
</s>
<s>
As	O
of	O
ChessV	B-Application
0.93	O
,	O
it	O
is	O
possible	O
to	O
customize	O
the	O
variants	O
it	O
supports	O
.	O
</s>
<s>
Of	O
all	O
chess	B-Application
variants	O
supported	O
,	O
two	O
of	O
the	O
most-played	O
variants	O
are	O
probably	O
Fischer	O
Random	O
Chess	B-Application
and	O
Grand	O
Chess	B-Application
.	O
</s>
<s>
ChessV	B-Application
is	O
capable	O
of	O
playing	O
:	O
</s>
<s>
While	O
users	O
can	O
create	O
custom	O
variants	O
with	O
ChessV	B-Application
0.93	O
,	O
it	O
needs	O
to	O
be	O
recompiled	O
,	O
which	O
is	O
tedious	O
when	O
programming	O
.	O
</s>
<s>
ChessV	B-Application
2.0	O
+	O
fixes	O
this	O
,	O
using	O
a	O
scripting	O
language	O
.	O
</s>
<s>
While	O
the	O
pieces	O
in	O
a	O
custom	O
variant	O
have	O
to	O
be	O
chosen	O
from	O
a	O
limited	O
list	O
,	O
this	O
allows	O
ChessV	B-Application
to	O
play	O
hundreds	O
or	O
thousands	O
of	O
variants	O
of	O
each	O
game	O
it	O
directly	O
supports	O
.	O
</s>
<s>
Searching	B-Application
:	O
Alpha-Beta	B-Algorithm
Nega-Max	B-Algorithm
Principal	O
variation	O
search	O
,	O
Iterative	B-Algorithm
deepening	I-Algorithm
,	O
Null-move	B-Algorithm
Forward	O
Pruning	O
,	O
Static	O
Exchange	O
Evaluation	O
(	O
SEE	O
)	O
.	O
</s>
<s>
Search	O
Extensions	O
:	O
check	O
extension	O
,	O
recapture	O
extension	O
,	O
null-move	B-Algorithm
threat	O
extension	O
,	O
PV	O
extension	O
,	O
Futility	O
Pruning	O
and	O
Razoring	O
,	O
History	O
Heuristic	B-Algorithm
,	O
Killer-move	B-Algorithm
heuristic	I-Algorithm
.	O
</s>
<s>
Hash	B-Algorithm
Tables	I-Algorithm
:	O
Transposition	B-General_Concept
table	I-General_Concept
,	O
Pawn	O
structure	O
table	O
,	O
Evaluation	O
cache	B-General_Concept
,	O
Repetition	O
detection	O
.	O
</s>
<s>
Since	O
ChessV	B-Application
2.2	O
,	O
the	O
engine	O
can	O
be	O
set	O
to	O
adjust	O
to	O
their	O
player	O
's	O
needs	O
:	O
</s>
<s>
Transposition	B-General_Concept
Table	I-General_Concept
Size	O
can	O
be	O
adjusted	O
.	O
</s>
<s>
Weaken	O
the	O
chess	B-Application
engine	I-Application
to	O
be	O
human-beatable	O
even	O
for	O
beginners	O
.	O
</s>
<s>
ChessV	B-Application
supports	O
many	O
variants	O
.	O
</s>
<s>
Other	O
than	O
chess	B-Application
,	O
it	O
supports	O
:	O
</s>
<s>
Alice	O
Chess	B-Application
,	O
Almost	O
Chess	B-Application
,	O
Archchess	O
,	O
Berolina	O
Chess	B-Application
,	O
Bird	O
's	O
Chess	B-Application
,	O
Capablanca	O
Chess	B-Application
and	O
its	O
variants	O
,	O
Carrera	O
's	O
Chess	B-Application
,	O
Chess480	O
,	O
Chess	B-Application
and	O
a	O
Half	O
,	O
Chess	B-Application
with	O
Different	O
Armies	O
,	O
Courier	O
Chess	B-Application
,	O
Cylindrical	O
Chess	B-Application
,	O
Diagonal	O
Chess	B-Application
,	O
Diamond	O
Chess	B-Application
,	O
Doublemove	O
chess	B-Application
,	O
Embassy	O
Chess	B-Application
,	O
Eurasian	O
Chess	B-Application
,	O
Extinction	O
Chess	B-Application
,	O
Fischer	O
Random	O
Chess	B-Application
(	O
Chess960	O
)	O
,	O
Great	O
Chess	B-Application
,	O
Great	O
Shatranj	O
,	O
Grand	O
Chess	B-Application
,	O
Grotesque	O
Chess	B-Application
,	O
Janus	O
Chess	B-Application
,	O
Kinglet	O
,	O
Ladorean	O
Chess	B-Application
,	O
Legan	O
's	O
Game	O
,	O
Los	O
Alamos	O
Chess	B-Application
,	O
Makruk	O
,	O
Omega	O
Chess	B-Application
,	O
Opulent	O
Chess	B-Application
,	O
Roman	O
Chess	B-Application
,	O
Royal	O
Court	O
,	O
Shatranj	O
,	O
Shatranj	O
Kamil	O
,	O
Sosarian	O
Chess	B-Application
,	O
Switching	O
Chess	B-Application
,	O
TenCubed	O
Chess	B-Application
,	O
Three	O
Checks	O
Chess	B-Application
,	O
and	O
more	O
infamous	O
variants	O
.	O
</s>
<s>
Since	O
ChessV	B-Application
can	O
be	O
programmed	O
to	O
play	O
additional	O
variants	O
,	O
here	O
are	O
a	O
few	O
examples	O
:	O
</s>
<s>
Almost	O
Chess	B-Application
,	O
Enep	O
,	O
Butterfly	O
Chess	B-Application
,	O
Nightrider	O
chess	B-Application
and	O
Janus	O
Kamil	O
.	O
</s>
<s>
ChessV	B-Application
code	O
is	O
saved	O
as	O
the	O
extension	O
"	O
.cvc	O
"	O
(	O
ChessV	B-Application
Code	O
)	O
.	O
</s>
<s>
Its	O
syntax	O
is	O
reasonably	O
similar	O
to	O
C#	B-Application
.	O
</s>
<s>
Here	O
is	O
an	O
example	O
of	O
"	O
Almost	O
Chess	B-Application
"	O
in	O
.cvc	O
code	O
:	O
</s>
<s>
ChessV	B-Application
software	O
won	O
third	O
place	O
in	O
a	O
2004	O
Gothic	O
Chess	B-Application
Computer	I-Application
World	O
Championship	O
.	O
</s>
