[Retros] Shanah Tovah!

Elkies, Noam elkies at math.harvard.edu
Sat Sep 19 17:49:36 EDT 2020

Andrew Buchanan <andrew at anselan.com> writes:

> OSPG means "one-sided proof game". No Black pieces at all
> to interfere with the solitaire.


> In this case, it should be possible to find a regular series proof game,
> where the Black army just sits there.

Doesn't the latest version of Popeye (which I don't have yet)
have a setting that lets one test OSPG's directly, without
the need to work around a static Black array?

> Maybe:
> https://www.janko.at/Retros/d.php?ff=rnbqkbnr/ppppppPp/8/R7/PQPP3P/1P2PR2/B4P2/B3KNN1

The wQ has to be on b6; the problem with Qb4 is that d4 gives Her Majesty
an alternative path d1-d2-b4.  Other than that your version looks good to me.


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