<s>
Nolot	B-General_Concept
is	O
a	O
chess	B-Application
test	O
suite	O
with	O
11	O
very	O
difficult	O
positions	O
from	O
real	O
games	O
.	O
</s>
<s>
They	O
were	O
compiled	O
by	O
Pierre	O
Nolot	B-General_Concept
for	O
the	O
French	O
chess	B-Application
magazine	O
Gambisco	O
and	O
posted	O
on	O
the	O
rec.games.chess	O
Usenet	B-Application
group	O
in	O
1994	O
.	O
</s>
<s>
Some	O
of	O
these	O
positions	O
were	O
particularly	O
hard	O
to	O
solve	O
for	O
chess	B-Application
engines	I-Application
at	O
the	O
time	O
.	O
</s>
<s>
Pierre	O
Nolot	B-General_Concept
seems	O
to	O
have	O
repudiated	O
this	O
problem	O
.	O
</s>
