[Retros] recent improvements
mri_two at t-online.de
Sun Dec 17 15:07:58 EST 2006
> But really they belong to Mario, if you would care to peer into your
> database and tell us what the solutions are!
My goal with providing the list without giving example games/positions
- helping to avoid waste of time for attempts to improve
records which are already optimal
- giving those who try to improve the current records some indications
where their efforts can be succesful
So if somebody finds an instance for a category mentioned in my
list - like Olli and Noam recently did - then he should get the
attribution as the composer, not my computer.
> Extrapolating the values you gave, the 12 ply case might take of the order
> of 100 hours. Is this possible for you to run? Or does Francois Labelle
> access to more powerful hardware that he might run?
The way my program works, it isn't only a matter of time,
but of space too, so an exthausive search for plies > 11 might not
be the best solution or even impractical.
But I can pick out some of the current records which look like
they can be improved, and try to break them.
> Mario -- you didn't specify whether "realizable" means in a sound
> proof game or in an unrestricted game, but now I see it must have been
> the former because g7-g8Q(R)# can be easily shown in 11 ply without
> the soundness condition, e.g. 1 g4 g6 2 g6 Nh6 3 gxh6 Bg7 4 hxg7 h5
> 5 random Rh7 6 g8R#.
With realizable I meant exactly that:
- the proofgame has exactly one solution
- there is not shorter uniquely realizable game with
the same mating pattern (i.e. with e.g Pe7xd8# there is neither
a shorter correct SPG with Pe7xd8# nor one with Pe2xd1#).
> Did you keep track of how many sound proof games
> each minimally "realizable" promotion mate had?
For 9 and 10 plies I can provide them immediatly, the data for 11 plies
follow in a later posting:
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