<s>
Dueling	B-Application
Network	I-Application
(	O
commonly	O
abbreviated	O
DN	O
)	O
was	O
an	O
online	B-Application
,	O
unofficial	O
Adobe	B-Operating_System
Flash	I-Operating_System
–	O
based	O
simulation	O
of	O
the	O
Yu-Gi-Oh	O
!	O
</s>
<s>
At	O
its	O
peak	O
,	O
its	O
server	B-Application
allowed	O
for	O
more	O
than	O
10,000	O
players	O
to	O
be	O
online	B-Application
at	O
the	O
same	O
time	O
.	O
</s>
<s>
Dueling	B-Application
Network	I-Application
started	O
on	O
May	O
8	O
,	O
2011	O
and	O
officially	O
released	O
on	O
May	O
17	O
,	O
2011	O
.	O
</s>
<s>
Dueling	B-Application
Network	I-Application
updated	O
its	O
database	O
with	O
all	O
available	O
in	O
Yu-Gi-Oh	O
!	O
</s>
<s>
For	O
rating	O
calculation	O
,	O
Dueling	B-Application
Network	I-Application
used	O
the	O
formula	O
,	O
where	O
was	O
the	O
scaling	O
factor	O
for	O
rating	O
adjustments	O
,	O
represented	O
the	O
result	O
of	O
the	O
game	O
(	O
1	O
for	O
a	O
win	O
,	O
0.5	O
for	O
a	O
draw	O
,	O
0	O
for	O
a	O
loss	O
)	O
,	O
and	O
represented	O
the	O
expected	O
result	O
of	O
the	O
game	O
,	O
determined	O
by	O
the	O
relative	O
ratings	O
of	O
the	O
players	O
(	O
close	O
to	O
1	O
for	O
almost	O
certain	O
victory	O
,	O
close	O
to	O
0	O
for	O
almost	O
certain	O
loss	O
,	O
0.5	O
for	O
even	O
match-up	O
)	O
.	O
</s>
<s>
The	O
Rankings	O
section	O
was	O
the	O
leader	O
board	O
of	O
Dueling	B-Application
Network	I-Application
;	O
it	O
showed	O
singles	O
or	O
matches	O
.	O
</s>
<s>
Administrators	O
dealt	O
with	O
problems	O
in	O
which	O
players	O
found	O
themselves	O
,	O
such	O
as	O
in-game	O
ruling	O
questions	O
,	O
glitches	B-Error_Name
,	O
AFK	O
,	O
spam	O
,	O
cheating	O
,	O
and	O
harassment	O
.	O
</s>
<s>
The	O
Dueling	B-Application
Network	I-Application
Forum	I-Application
(	O
DNF	O
)	O
was	O
the	O
official	O
forum	O
of	O
Dueling	B-Application
Network	I-Application
.	O
</s>
<s>
On	O
July	O
5	O
,	O
2016	O
,	O
the	O
date	O
of	O
the	O
Dueling	B-Application
Network	I-Application
shutdown	O
,	O
the	O
Forum	O
was	O
still	O
active	O
.	O
</s>
<s>
On	O
July	O
5	O
,	O
2016	O
,	O
the	O
Dueling	B-Application
Network	I-Application
website	O
was	O
taken	O
offline	O
for	O
"	O
legal	O
reasons	O
...	O
until	O
further	O
notice	O
"	O
.	O
</s>
<s>
Dueling	B-Application
Network	I-Application
Forums	I-Application
planned	O
to	O
merge	O
with	O
The	O
Organization	O
forums	O
,	O
but	O
the	O
staff	O
reconsidered	O
.	O
</s>
<s>
A	O
former	O
Dueling	B-Application
Network	I-Application
administrator	O
made	O
a	O
replacement	O
called	O
Dueling	O
Book	O
.	O
</s>
