[Retros] Three SPG's from Paul Monsky

[Noam Elkies]

Nicolas Dupont writes:


> Happy new year to you all !


Merci!


> Natch's verdict :  [...]


Thanks for checking these; 2+ hours looks like a significant computation
for a 15.5 mover...  Mario Richter meanwhile reports that he C+'d both
proof games with his own program.


> Crossed captures have been extensively studied. I remember a PJ

> (by Andrey Frolkin ?) showing 8 of them by the same side !


I didn't remember that, but then I didn't expect that
cross-captures in themselves would be new.  The interest here
would be the combination of cross-captures with other elements:
in the 13.0 mover, both cross-captures are of promoted pieces;
in the 15.5, both Kingside Rooks must travel to the initial square
of their Queenside compatriot (with the cross-captures taking
one of the QR's plus a promotee).  Have both of these combinations
been shown already?

NDE