Re: [Bug-gnubg] Analysis changing the game record and producing garbage

[Christian Anthon]

An example sgf (as small as possible) and minimal instructions to
reproduce the problem would be very helpful.

Christian.

On Tue, Oct 6, 2009 at 10:40 AM, Neil Robins <address@hidden> wrote:
> I have analysed several matches at 4-ply using the 20091002 Windows build. I
> am finding the move made in the game record often being changed from that
> actually played in the match to what GNU thought best - which obviosly then
> renders the rest of the game meaningless garbage full of illegal moves.
>
> Example:
>
>  GNU Backgammon  Position ID: sHPkASjg6+ABJA
>                  Match ID   : MAH6ACAACAAA
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+     O: Opp
>  | X           O  O |   | O           X  X |     2 points
>  | X           O    |   | O                |     Rolled 46
>  | X           O    |   | O                |
>  | X                |   | O                |
>  |                  |   | O                |
> ^|                  |BAR|                  |     7 point match (Cube: 1)
>  |                  |   |                  |
>  | O                |   |                  |
>  | O           X    |   | X                |
>  | O           X    |   | X  X             |
>  | O  X        X    |   | X  X     O     O |     1 point
>  +13-14-15-16-17-18------19-20-21-22-23-24-+     X: You
>
>  1. Cubeful 4-ply    24/18 22/18                  Eq.:  -0.209
>        0.467 0.094 0.002 - 0.533 0.127 0.004
>         4-ply cubeful prune
>     2. Cubeful 4-ply    8/2* 6/2                     Eq.:  -0.327 ( -0.118)
>        0.433 0.146 0.007 - 0.567 0.165 0.008
>         4-ply cubeful prune
> My opponent moved 8/2* 6/2 which is correctly highlighted in red. The
> problem is that GNU puts its preferred 24/18 22/18 into the game record in
> place of 8/2* 6/2 - thus rendering all further analysis of that game
> meaningless.
> This nonsense seems to have affected almost all the games I have analysed.
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