[Retros] At home proof games in 7.0 moves

Francois Labelle flab at EECS.Berkeley.EDU
Sun Feb 13 03:01:05 EST 2005

Otto Janko wrote:

> What about a contribution to the "Encyclopedia of Integer Sequences"?

I was thinking about it, but there are other contenders for interesting
subsets of proof games: mirror-symmetric, checkmate, castling, en-passant,
promotion, Pronkin, Ceriani-Frolkin, ...

And there's the question of whether it is PGs or SPGs which should be

But in the at-home case, 14 plies is exceptionally far, and I'm very
confident in the results. So I sent the at-home PG sequence and it got


Someday I plan to extend the general PG sequence A090051 to ply 9, and I
think that this one will deserve its SPG version to be sent to the
encyclopedia as well.


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