<s>
Komodo	B-Application
and	O
Dragon	B-Application
by	I-Application
Komodo	I-Application
Chess	I-Application
(	O
also	O
known	O
as	O
Dragon	O
or	O
Komodo	B-Application
Dragon	I-Application
)	O
are	O
UCI	B-General_Concept
chess	B-Application
engines	I-Application
developed	O
by	O
Komodo	B-Application
Chess	I-Application
,	O
which	O
is	O
a	O
part	O
of	O
Chess.com	B-Application
.	O
</s>
<s>
Dragon	O
is	O
a	O
commercial	B-Application
chess	B-Application
engine	I-Application
,	O
but	O
Komodo	B-Application
is	O
free	O
for	O
non-commercial	O
use	O
.	O
</s>
<s>
Dragon	O
is	O
consistently	O
ranked	O
near	O
the	O
top	O
of	O
most	O
major	O
chess	B-Application
engine	I-Application
rating	O
lists	O
,	O
along	O
with	O
Stockfish	B-Application
and	O
Leela	B-Application
Chess	I-Application
Zero	I-Application
.	O
</s>
<s>
Komodo	B-Application
was	O
derived	O
from	O
Don	O
Dailey	O
's	O
former	O
engine	O
Doch	O
in	O
January	O
2010	O
.	O
</s>
<s>
The	O
first	O
multiprocessor	O
version	O
of	O
Komodo	B-Application
was	O
released	O
in	O
June	O
2013	O
as	O
Komodo	B-Application
5.1	O
MP	O
.	O
</s>
<s>
This	O
version	O
was	O
a	O
major	O
rewrite	O
and	O
a	O
port	O
of	O
Komodo	B-Application
to	O
C++11	B-Language
.	I-Language
</s>
<s>
A	O
single-processor	O
version	O
of	O
Komodo	B-Application
(	O
which	O
won	O
the	O
CCT15	O
tournament	O
in	O
February	O
earlier	O
that	O
year	O
)	O
was	O
released	O
as	O
a	O
stand-alone	O
product	O
shortly	O
before	O
the	O
5.1	O
MP	O
release	O
.	O
</s>
<s>
This	O
version	O
,	O
named	O
Komodo	B-Application
CCT	O
,	O
was	O
still	O
based	O
on	O
the	O
older	O
C	B-Language
code	O
,	O
and	O
was	O
approximately	O
30	O
Elo	O
stronger	O
than	O
the	O
5.1	O
MP	O
version	O
,	O
as	O
the	O
latter	O
was	O
still	O
undergoing	O
massive	O
code-cleanup	O
work	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
Komodo	B-Application
6	O
on	O
4	O
October	O
2013	O
,	O
Don	O
Dailey	O
announced	O
that	O
he	O
was	O
suffering	O
from	O
an	O
acute	O
form	O
of	O
leukaemia	O
,	O
and	O
would	O
no	O
longer	O
contribute	O
to	O
the	O
future	O
development	O
of	O
Komodo	B-Application
.	O
</s>
<s>
On	O
October	O
8	O
,	O
Don	O
made	O
an	O
announcement	O
on	O
the	O
Talkchess	O
forum	O
that	O
Mark	O
Lefler	O
would	O
be	O
joining	O
the	O
Komodo	B-Application
team	O
and	O
would	O
continue	O
its	O
development	O
.	O
</s>
<s>
On	O
May	O
24	O
,	O
2018	O
,	O
Chess.com	B-Application
announced	O
that	O
it	O
has	O
acquired	O
Komodo	B-Application
and	O
that	O
the	O
Komodo	B-Application
team	O
have	O
joined	O
Chess.com	B-Application
.	O
</s>
<s>
The	O
Komodo	B-Application
team	O
is	O
now	O
called	O
Komodo	B-Application
Chess	I-Application
.	O
</s>
<s>
On	O
December	O
17	O
,	O
2018	O
,	O
Komodo	B-Application
Chess	I-Application
released	O
Komodo	B-Application
12.3	O
MCTS	O
,	O
a	O
version	O
of	O
the	O
Komodo	B-Application
12.3	O
engine	O
that	O
uses	O
Monte	B-Application
Carlo	I-Application
tree	I-Application
search	I-Application
instead	O
of	O
alpha	O
–	O
beta	O
pruning/minimax	O
.	O
</s>
<s>
The	O
latest	O
version	O
,	O
Komodo	B-Application
14.1	O
,	O
was	O
released	O
on	O
November	O
2	O
,	O
2020	O
.	O
</s>
<s>
On	O
November	O
9	O
,	O
2020	O
,	O
Komodo	B-Application
Chess	I-Application
released	O
Dragon	B-Application
by	I-Application
Komodo	I-Application
Chess	I-Application
1.0	O
,	O
which	O
features	O
the	O
use	O
of	O
efficiently	B-General_Concept
updatable	I-General_Concept
neural	I-General_Concept
networks	I-General_Concept
in	O
its	O
evaluation	B-General_Concept
function	I-General_Concept
.	O
</s>
<s>
Dragon	O
is	O
derived	O
from	O
Komodo	B-Application
in	O
the	O
same	O
way	O
that	O
Komodo	B-Application
was	O
derived	O
from	O
Doch	O
.	O
</s>
<s>
Dragon	O
is	O
also	O
called	O
Komodo	B-Application
Dragon	I-Application
in	O
certain	O
tournaments	O
such	O
as	O
the	O
Top	O
Chess	B-Application
Engine	I-Application
Championship	O
and	O
the	O
World	O
Computer	O
Chess	O
Championship	O
(	O
WCCC	O
)	O
but	O
not	O
in	O
the	O
Chess.com	B-Application
Computer	O
Chess	O
Championship	O
(	O
CCC	O
)	O
.	O
</s>
<s>
A	O
Chess.com	B-Application
staff	O
member	O
named	O
Dmitry	O
Pervov	O
joined	O
the	O
Dragon	O
development	O
team	O
to	O
write	O
the	O
NNUE	B-General_Concept
code	O
for	O
Dragon	O
,	O
and	O
Dietrich	O
Kappe	O
joined	O
the	O
Dragon	O
development	O
team	O
to	O
help	O
Larry	O
Kaufman	O
and	O
Mark	O
Lefter	O
train	O
Dragon	O
's	O
neural	O
networks	O
.	O
</s>
<s>
On	O
March	O
17	O
,	O
2023	O
,	O
Larry	O
Kaufman	O
announced	O
that	O
he	O
and	O
Mark	O
Lefter	O
have	O
stepped	O
down	O
from	O
Dragon	O
development	O
and	O
from	O
ownership	O
of	O
Komodo	B-Application
Chess	I-Application
,	O
and	O
that	O
Chess.com	B-Application
have	O
taken	O
full	O
control	O
of	O
Komodo	B-Application
Chess	I-Application
.	O
</s>
<s>
As	O
of	O
March	O
17	O
,	O
2023	O
,	O
Dietrich	O
Kappe	O
is	O
the	O
only	O
person	O
responsible	O
for	O
the	O
development	O
of	O
Dragon	O
,	O
but	O
Chess.com	B-Application
are	O
looking	O
for	O
more	O
programmers	O
to	O
help	O
with	O
Dragon	O
development	O
.	O
</s>
<s>
Komodo	B-Application
has	O
played	O
in	O
the	O
ICT	O
2010	O
in	O
Leiden	O
,	O
and	O
further	O
in	O
the	O
CCT12	O
and	O
CCT14	O
.	O
</s>
<s>
Komodo	B-Application
had	O
its	O
first	O
tournament	O
success	O
in	O
1999	O
,	O
when	O
it	O
won	O
the	O
CCT15	O
with	O
a	O
score	O
of	O
6½/7	O
.	O
</s>
<s>
Komodo	B-Application
also	O
fared	O
very	O
well	O
in	O
the	O
TCEC	O
competition	O
,	O
where	O
in	O
Season	O
4	O
,	O
it	O
lost	O
only	O
eight	O
out	O
of	O
its	O
53	O
games	O
and	O
managed	O
to	O
reach	O
Stage	O
4	O
(	O
Quarterfinals	O
)	O
,	O
against	O
very	O
strong	O
competition	O
which	O
were	O
running	O
on	O
eight	O
cores	O
(	O
Komodo	B-Application
was	O
running	O
on	O
a	O
single	O
processor	O
)	O
.	O
</s>
<s>
In	O
TCEC	O
Season	O
5	O
,	O
it	O
won	O
the	O
superfinal	O
against	O
Stockfish	B-Application
.	O
</s>
<s>
It	O
managed	O
to	O
reach	O
the	O
Superfinal	O
in	O
TCEC	O
Season	O
6	O
again	O
,	O
but	O
this	O
time	O
,	O
it	O
lost	O
to	O
Stockfish	B-Application
.	O
</s>
<s>
Komodo	B-Application
regained	O
the	O
title	O
in	O
TCEC	O
Season	O
7	O
,	O
defeating	O
Stockfish	B-Application
in	O
the	O
superfinal	O
.	O
</s>
<s>
In	O
TCEC	O
Season	O
8	O
,	O
Komodo	B-Application
defeated	O
Stockfish	B-Application
again	O
in	O
the	O
superfinal	O
.	O
</s>
<s>
Komodo	B-Application
won	O
both	O
the	O
World	O
Computer	O
Chess	O
Championship	O
and	O
World	O
Computer	O
Software	O
Championship	O
in	O
2016	O
.	O
</s>
<s>
Komodo	B-Application
once	O
again	O
won	O
the	O
World	O
Computer	O
Chess	O
Championship	O
and	O
World	O
Blitz	O
in	O
2017	O
.	O
</s>
<s>
Komodo	B-Application
came	O
third	O
in	O
TCEC	O
Season	O
11	O
losing	O
to	O
Stockfish	B-Application
and	O
Houdini	O
,	O
and	O
came	O
second	O
in	O
Season	O
12	O
losing	O
to	O
Stockfish	B-Application
.	O
</s>
<s>
Komodo	B-Application
sacrifices	O
an	O
exchange	O
for	O
positional	O
gain	O
.	O
</s>
