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Re: [Bug-gnubg] Bearoff dB position, few questions
From: |
Massimiliano Maini |
Subject: |
Re: [Bug-gnubg] Bearoff dB position, few questions |
Date: |
Fri, 26 Jun 2009 13:30:23 +0200 |
Massimiliano Maini
Product Manager Availability and Schedules
Availability and Shopping
Amadeus IT Group SA
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wrote on 26/06/2009 12:58:56:
> On Fri, Jun 26, 2009 at 12:37 PM, Misja Alma<address@hidden>
wrote:
> > Hi Alain,
> >
> > Yeah you're right that cubeless equities can well be different
for
> > matchplay and money play.
> > But not only is the equity different, also the 'Win' percentage
is
> > different that is shown together with the W(g), W(bg) etc when
you
> > click the 'hint' button.
> > The winning chance refers to the chance of just winning the game,
so
> > it should be the same for moneygame and matchplay. Or at least
in
> > cubeless bearoffs it should, because there are no gammons to
save and
> > all that.
> >
> > Misja
>
> Keep in mind that cubeless evaluations depend on cubeless/cubeful
> setting since the moves may depend on the score and cube value. So
can
> you show me the output without the 2 sided db and without cubeful
> evaluation.
I think it's simpler than that:
- open the money position, ask for a hint at 0/1/2/3ply:
the GWC will not
change, as they always come from the 2s bearoff db.
- open the match position, ask for a hint at 0/1/2/3ply:
the GWC will
change each time. I suspect this comes from the fact
that gnubg takes
0ply GWC (for positions N plies ahead, if we are a
N-ply) from the 2s
db and then apply 1/2/3 ply on top. I think gnubg
does this because he
does the same for cubeful equities. It would probably
be better/more
logical to take cubeless GWC for the current position
from the dB,
without any ply applied on top.
In other words, for match play: for a 2ply eval (cubeful
and cubeless)
gnubg needs 1ply eval of subsequent positions which
needs 0ply eval of
"subsequent subsequent" positions. I think
0ply cubeless GWCs of
"subsequent subsequent" positions come from
the dB, but then they are
plied to get 2ply cubeless of the original position
(just like 0ply
cubeful, obtained via janowski'd formula, are then
plied to get 2ply
cubeful of the original position).
Side question (purely theoretical): is it true that
cubeless GWC
(including g and bg %) for a given position are the
same no matter the
score (including money play) ?
This is somehow similar to supposing that the gammon
ratio or percentage
is the same across the whole MET ...
MaX.
- Re: [Bug-gnubg] Bearoff dB position, few questions, (continued)
- Re: [Bug-gnubg] Bearoff dB position, few questions, Christian Anthon, 2009/06/25
- Re: [Bug-gnubg] Bearoff dB position, few questions, Misja Alma, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions, Christian Anthon, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions, Massimiliano Maini, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions, Misja Alma, 2009/06/26
- RE: [Bug-gnubg] Bearoff dB position, few questions, Alain Redlinger, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions, Misja Alma, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions, Christian Anthon, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions, Misja Alma, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions, Massimiliano Maini, 2009/06/26
- Re: [Bug-gnubg] Bearoff dB position, few questions,
Massimiliano Maini <=
- Re: [Bug-gnubg] Bearoff dB position, few questions, Misja Alma, 2009/06/26
Re: [Bug-gnubg] Bearoff dB position, few questions, Robert-Jan Veldhuizen, 2009/06/28
RE: [Bug-gnubg] Bearoff dB position, few questions, Alain Redlinger, 2009/06/26
RE: [Bug-gnubg] Bearoff dB position, few questions, Alain Redlinger, 2009/06/27