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## Fw: [Bug-gnubg] The meaning of the numbers in the double evaluation

 From: W.Stroop Subject: Fw: [Bug-gnubg] The meaning of the numbers in the double evaluation Date: Tue, 19 Nov 2002 03:23:55 +0100

```----- Original Message -----
Sent: Tuesday, November 19, 2002 3:21 AM
Subject: Re: [Bug-gnubg] The meaning of the numbers in the double evaluation

>
> ----- Original Message -----
> From: Tim Daughters
> Sent: Saturday, November 16, 2002 10:34 PM
> Subject: [Bug-gnubg] The meaning of the numbers in the double evaluation
>
>
> What is meant by the numbers to the right of the "No double", and "Double,
> take" fields when I choose "Evaluate"?  I thought that it would be the
> expected value of each option (I think that is true for "Double, pass"
since
> it is always 1.), but it can't be right for the other two options.  Here
is
> an example:
>
> I set up a board position with the player having a checker on the 3 and 2
> point, and gnubg having a checker on the 2 point.  It is the player's
roll.
> The player will win with 25 out of 36 rolls, and will lose on the other
11.
> That gives the player an expected value of (25-11)/36 = 0.389 to roll it
out
> and double that for an accepted double.  Since the player will refuse any
> redouble if he doesn't win on the next roll.
>
> The Evaluation option lists this information:
>
> No double     : 0.594
> Double, pass: 1.000
> Double, take : 0.594
>
> What do those numbers mean?
>
>
>
> Hi there :)
>
> The program improved a lot since August .
>
>  Great job !!!!
>
> Those numbers represent equity.
>  I  did not succeed in copying y're result of the same posistion. ( i
> suppose it's a money game)
> Instead i got this :
> Evaluator:  BEAROFF2
>
>              Player       Opponent
> Position           14             2
>
> Rolls Player Opponent
>     1 69,444  100,000
>     2 30,556    0,000
>
> Average rolls
> Bearing off
>  Player Opponent
> Mean   1,305   1,000
> Std dev   0,461   0,021
>
>         Win    W(g)   W(bg)  L(g)   L(bg)  Equity  (cubeful)
> static:  69,4%   0,0%   0,0%   0,0%   0,0% (+0,389  (+0,594))
>  1 ply:  69,4%   0,0%   0,0%   0,0%   0,0% (+0,389  (+0,778))
>  2 ply:  69,4%   0,0%   0,0%   0,0%   0,0% (+0,389  (+0,778))
>
>
> Double, take        : +0,778
> Double, pass        : +1,000   (+0,222)
> No double           : +0,389   (-0,389)
>
> Correct cube action: Double, take
>

```