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Re: [Bug-gnubg] G/BG rates [minor ?]
From: |
Joern Thyssen |
Subject: |
Re: [Bug-gnubg] G/BG rates [minor ?] |
Date: |
Mon, 8 Sep 2003 11:42:12 +0000 |
User-agent: |
Mutt/1.4.1i |
On Mon, Sep 08, 2003 at 12:16:09PM +0200, address@hidden wrote
>
>
> Hi all,
>
> I do the following :
>
> - evaluate a position (anyone where market window make sense/is allowed)
>
> - write down the static, 1 ply and 2 ply [Win, W(g), W(bg)] percentages
>
> - open the "Market Window Analyzer" and try to see if the indicated gammon
> and backgammon rates matches the ones you can compute manually
>
> EXAMPLE :
>
> This is the output of the Evaluation :
>
> Position ID: 4HPiQSDgc/ABMA
> Match ID: cAngAAAAAAAA
>
> Evaluator: CONTACT
>
> <SNIP ... SNIP>
>
> Win W(g) W(bg) L(g) L(bg) Equity Cubeful
> static: 48,46% 13,86% 0,41% 13,49% 0,72% -0,0304 -0,0458
> 1 ply: 50,32% 14,01% 0,50% 12,90% 0,48% +0,0186 +0,0232
> 2 ply: 48,58% 13,59% 0,44% 13,58% 0,63% -0,0305 -0,0436
>
> Now I was expecting :
>
> gammon rate (static) = 13.86/48.46 = 28.60%
> gammon rate (1 ply) = 14.01/50.32 = 27.84%
> gammon rate (2 ply) = 13.59/48.58 = 27.97%
Note as well as Win includes W(g) and W(bg), W(g) includes W(bg), so I'd
expect:
gammon rate (static) = (13.86-0.41)/48.46 = 27.75%
gammon rate (1-ply) = (14.01-0.50)/50.32 = 26.85%
gammon rate( 2-ply) = (13.59-0.44)/48.58 = 27.07%
I guess the small differences to the ones calculaetd by the market
window is due to rounding errors.
>
> But in the "Market Window Analyzer" GNUbg shows :
>
> gammon rate (static) = 27.75%
> gammon rate (1 ply) = 26.87%
> gammon rate (2 ply) = 27.04%
>
> Small (not so small in fact) differences exists for backgammon rates
> too, no matter the ply and for both players.
I wouldn't expect any difference on the bg percentages, except those who
can be attributed to rounding errors. For example,
bg rate( static) = 0.50/48.46 = 0.10%
ørn
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