Re: [Bug-gnubg] Hint only uses 0-ply when importing / setting positions

[Joern Thyssen]

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