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Re: FW: [Bug-gnubg] Update: Checkerplay vs cube decision errors
From: |
kvandoel |
Subject: |
Re: FW: [Bug-gnubg] Update: Checkerplay vs cube decision errors |
Date: |
Wed, 19 May 2004 20:13:27 +0200 (CEST) |
Hi,
Apart from noticing the misspelling of my name I have more comments:
Since chequer errors and cube errors really have different "units" the
ratio of the coefficients a2 and b is meaningless.
A meaningful measure is:
M = a2(N)*EPM / b(N)*EPC
M represents ratio of rating points lost due to chequer error adn cube
error. Clearly it is player dependent. For me it is usually 10 in actual
games I play.
Now in the article this is rewritten in the form of Eq. 5. The table
below Eq. 5 plots something undefined but I guess it is
(a2(N)/UFM(N))/(b(N)/UFC)
with UFM # unforced moves and UFC # unforced cubes as obtained from
rollout.
This is the ratio of the coefficients of a bilinear fit to total error
rates of chequer and cube play. It is not clear to me this is really a
better measure than a2/b. We still have the fact that cube decisions are
really of a different kind than chequer play decisions even though both
can be expressed in equity losses.
I don't understand the ssecond paragraph of the "Results". If the cutoff
for actual cube decision is decreased to .05 the # of actual cube
decision goes down and the coefficient b(N) will also go down (it was
measured assuming a fixed cutoff) so nothing changes.
In the 3d paragraph I read "... doubtful to clain cube error were
less..". I don't see any arguments that support that claim.
The opposite statement "cube errors are less important than chequer
errors" has no rigorous meaning either. It just seems in practice that
the rating points you lose due to cube errors are much less than the
loss due to chequer play.
Kees
--
On Tue, 18 May 2004, Albert Silver wrote:
> Hi Joachim,
>
> I'm taking the liberty of forwarding this to Kees so that he may
> read your comments and respond to them if he so desires.
>
> Regards,
>
> Albert
>
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of
> Joachim Matussek
> Sent: Tuesday, May 18, 2004 9:51 AM
> To: address@hidden
> Subject: [Bug-gnubg] Update: Checkerplay vs cube decision errors
>
> Hello,
>
> it didn?t let me sleep.
>
> After thoroughly examining Kees van Doel?s scripts I have found an
> important misunderstanding. Within his item he uses the term "unforced
> cube decision" but in fact means "actual or close cube decision". This
> lead to many changes. Thus I had to rewrite my article.
>
> http://home.arcor.de/joachimmatussek/CheckerVsCubeErrorsImproved.zip
>
> Sorry for any inconvenience,
>
> Joachim Matussek
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