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Re: [Bug-gnubg] Why is odd ply equity always lower?

From: Ned Cross
Subject: Re: [Bug-gnubg] Why is odd ply equity always lower?
Date: Thu, 19 Jun 2003 09:57:56 -0700

----- Original Message ----- 
From: "Ian Shaw" <address@hidden>
To: "Nis" <address@hidden>; <address@hidden>
Sent: Thursday, June 19, 2003 3:59 AM
Subject: RE: [Bug-gnubg] Why is odd ply equity always lower?

> ---
> Only relevant for cube decisions?
> The wrong estimations of equity is mainly a problem of
> absolute equities.
> As Joseph has pointed out, chequerplay relies almost solely
> on the relative equities of positions.
> Thus a fix should only "need" to be applied for cube
> decisions (and cubeful
> chequerplay? Someone help me here)

A possible result of this even/odd ply equity discrepancy is GNU's cube
decisions in many situations.  I haven't been keeping a log, but I notice
numerous positions where GNU 2-ply evaluates double/take (usually somewhere
between 0.850 and 0.900) and GNU 3-ply evaluates double/pass (usually
somewhere between 1.000 and 1.100).  The difference seems to always be in
the same direction.


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