[Retros] SPGs ending stalemate

Noam Elkies elkies at math.harvard.edu
Sun Jun 15 21:42:49 EDT 2014

<raosorio at fibertel.com.ar> writes:

> I´m looking for SPGs ending stalemate.
> I remember there were a couple of antecedents.
> Could somebody help me to find them?

In 1996 I composed this:


As remarked at the end, It is not the first such example,
because 9 years earlier Frolkin published a massacre SPG
ending in stalemate.  Mine does not quite stalemate Black's
entire army; as I recall this task was accomplished a bit later,
after which there was a stalemate SPG in about 12 moves based on
the famous 9.5 move help-stalemate (which is already almost
but not quite an SPG).  I do not remember the sources for
these later problems.  Looking online I found


so I guess mine was published in StrateGems 17, and SG 19 presumably
contains either the solution or the 16-man stalemate (or both).

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