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Re: [Bug-gnubg] Hint only uses 0-ply when importing / setting positions
From: |
Joern Thyssen |
Subject: |
Re: [Bug-gnubg] Hint only uses 0-ply when importing / setting positions |
Date: |
Fri, 16 May 2003 14:40:11 +0000 |
User-agent: |
Mutt/1.4.1i |
On Fri, May 16, 2003 at 03:22:26PM +0200, Henrik Ravn wrote
> Hi there!
>
> GNU BG seems to be using 0-ply hints when you set positions up manually.
> Steps to reproduce:
>
> (Using GNU BG for Windows 030501)
>
> 1. Start GNUBG
> 2. Confirm that evaluation parameters are set to at least world class
> 3. select Edit->Enter command and enter "set matchid cInqADAAIAAA" (w/o
> quotes, of course), and click OK
> 4. select Edit->Enter command and enter "set board 4LsLgArgOTjAUQ" and click
> OK
> 5. Select Analyse->Hint
>
> This is what I get:
>
> 1. Cubeful 0-ply bar/23 21/16* MWC: 56,66%
> 0,483 0,094 0,003 - 0,517 0,176 0,007
> 0-ply cubeful [expert]
> 2. Cubeful 0-ply bar/20 6/4* MWC: 54,68% ( -1,98%)
> 0,458 0,081 0,002 - 0,542 0,234 0,012
> 0-ply cubeful [expert]
> .. etc ...
>
> This in spite of Evaluation parameters are clearly set to world class
> (and so should be using 2ply)
Not necesarily :-)
The world class setting uses the "normal" movefilter which has
Move filter for 2 ply:
keep the first 0 0-ply moves and up to 8 more moves within equity 0.16
Skip pruning for 1-ply moves.
The best move bar/23 21/16 has equity -0.251. Since the second best
move has equity -0.474 no moves are selected for 2-ply.
If you want to force analysis at 2-ply you need to select a move filter
with has "accept" larger than or equal to 2.
Jørn