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Re: [Bug-gnubg] 4 ply predefined level

From: Ian Shaw
Subject: Re: [Bug-gnubg] 4 ply predefined level
Date: Fri, 29 Jul 2011 09:31:50 +0000

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Michael Petch
Sent: 28 July 2011 23:07
To: address@hidden
Subject: Re: [Bug-gnubg] 4 ply predefined level

On 28/07/2011 3:56 PM, Philippe Michel wrote:
> With modern multicore machines, it has become practical to use 4 ply 
> for match analysis. I think it would be useful to create a predefined 
> setting for it.
> Moreover, the current settings are :
> world class : 2 ply, normal move filter supremo : 2 ply, large move 
> filter grandmaster : 3 ply, normal move filter
> Wouldn'it it be sensible to use a large move filter for this 4 ply 
> setting, but for the current grandmaster as well ?
> And obviously this new setting would need a name, ideally even more 
> impressive sounding than those above :-).
I wonder if it my be prudent to actually redefine World Class with higher 
settings and go from there?

One thing I'd like to see is that Grandmaster cube be reduced from 3 to 2. 3ply 
(or odd ply) for cube decisions can be problematic and give results that may be 
unusual. Depreli study pretty shows this as well.

Michael Petch

I agree that 4-ply should now be in the standard options, but I think 2-ply = 
World Class is a good baseline.

The labels are for convenience only; there is no generally recognised 
correlation between title and setting. Therefore, I would prefer to drop 
supremo, which I would guess is little used and barely different from the 
normal 2-ply.

That would leave:

0-ply: Expert
2-ply: World Class
3-ply: Supremo. I'm ambivalent about 2- or 3-ply cube setting. I've seen the 
studies but I do like to use 3-ply cube for holding games, because it is more 
accurate in those positions.
4-ply: Grandmaster

-- Ian Shaw

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