RE: [Bug-gnubg] How do you play a deuce point backgame?

[Ian Shaw]

> Øystein, I think there's something wrong with your position ID.
> 
> I think the right ID should be: j/8AAMB0N0AEBg
> This ID gives this board:
> 
>     GNU Backgammon  Position ID: j/8AAMB0N0AEBg
>                     Match ID   : UYkUAAAAAAAA
>     +24-23-22-21-20-19------18-17-16-15-14-13-+  O: GNUBackgammon
>   O | O  X     O       |   |    X        X    |  0 points
>   O | O  X     O       |   |                  |
>     | O        O       |   |                  |
>     | O        O       |   |                  |
>     |          9       |   |                  |
>     |                  |BAR|                  |v
>     |                  |   |                  |
>     |                  |   |                  |
>     |          X  X    |   |                  |
>     | X        X  X  X |   |                  |  Rolled 15
>     | X     X  X  X  X |   |                  |  0 points
>     +-1--2--3--4--5--6-------7--8--9-10-11-12-+  X: user (Cube: 2)
> 
> So the same question: How to play 51?
> 
> -Øystein
> 

I would play 23/18 to make O's 2s bad, then 4/3 to make a five point board.

    1. Cubeful 3-ply    23/18 4/3                    Eq.: -1.123
       0.138 0.000 0.000  - 0.862 0.453 0.002
    2. Cubeful 3-ply    17/11                        Eq.: -1.228 (-0.105)
       0.073 0.000 0.000  - 0.927 0.399 0.004
    3. Cubeful 3-ply    17/12 4/3                    Eq.: -1.232 (-0.109)
       0.084 0.000 0.000  - 0.916 0.428 0.004

0-ply had the top move way down, in about 20th.

    1. Cubeful 0-ply    14/8                         Eq.: -0.875
       0.185 0.000 0.000  - 0.815 0.309 0.005
    1. Cubeful 1-ply    23/22 17/12                  Eq.: -0.977
       0.167 0.000 0.000  - 0.833 0.371 0.004
    1. Cubeful 2-ply    17/11                        Eq.: -0.962
       0.156 0.000 0.000  - 0.844 0.327 0.006

Other stuff

I love the new features on the Hint window. (Windows build 020719), esp the
ability to upgrade the evaluation settings. I notice that you can't
downgrade them again, the higher ply settings are cached or something.
The results are remembered even if I create the position at a new location
in the game record. Ah! If I evaluate a different position the original
high-ply is lost and a lower-ply obtained.


In the Settings...Options, every time I press OK I get a popup window
telling me that I am already using Mersenne Twister RNG. This shouldn't
happen if I have not fiddled with it. (The new layout is much improved BTW.)


How come...
The position is set up by entering j/8AAMB0N0AEBg, but the game record
displays (Set Position 090AERiP/wAAAA)

--
Ian Shaw
ian on Fibs, GG