[Retros] Ultimate question

[Christoph Fieberg]

>Guys,

>

>It's all about finding questions at the right level of difficulty. How

>hard is the following one to answer?

>

>      Which of the billion-odd at-home positions are (S)PGs?

>

>Regards,

>Andrew.


You could extend the question to the ultimate question:

         Which of the maximum 30,3*10^45 chess positions are (S)PGs?

For the figure which I calculated as lowest maximum number of distinct 
chess positions see my article in the magazine "Computer Schach & Spiele", 
issue 2/02.

Regards,
Christoph