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Re: [Bug-gnubg] Confusing 2-away 2-away cube action


From: Joern Thyssen
Subject: Re: [Bug-gnubg] Confusing 2-away 2-away cube action
Date: Wed, 27 Nov 2002 10:24:29 +0000
User-agent: Mutt/1.4i

On Wed, Nov 27, 2002 at 09:39:28AM -0000, Ian Shaw wrote
>     GNU Backgammon  Position ID: 4HPwAFiYz8gFAg
>                     Match ID   : MAFgAZAASAAA
>     +-1--2--3--4--5--6-------7--8--9-10-11-12-+  O: GnuBg
>     | X        O     O |   |    O        O  X |  9 points
>     | X        O     O |   |    O           X |  On roll
>     |                O |   |                X |  
>     |                O |   |                X |  
>     |                O |   |                  |  
>     |                  |BAR|                  |^ 11 point match (Cube: 1)
>     |                X |   |                  |  
>     |                X |   |                  |  
>     |                X |   |    X           O |  
>     |                X |   |    X           O |  
>     |             O  X | X |    X        O  O |  9 points
>     +24-23-22-21-20-19------18-17-16-15-14-13-+  X: Ian
> 
> Cube analysis
> 2-ply cubeless MWC  62.70% (Money:  +0.634)
>   0.705 0.254 0.021 - 0.295 0.049 0.001
> 1. Double, take         54.86%
> 2. Double, pass         70.00%  (+15.14%)
> 3. No double            54.24%  ( -0.62%)
> Proper cube action: Double, take
> 
> I am using the W-H MET, so the take point is 30%. 2-ply evaluation has
> X's winning chances at 29.5%. There is no recube value, so this can't
> be a take.

Yes, it sure looks like something is wrong. The MWC for double, take
looks quite wrong.

Jørn

-- 
Joern Thyssen, PhD
Vendsysselgade 3, 3., DK-9000 Aalborg, Denmark
+45 9813 2791 (private) / +45 2818 0183 (mobile) / +45 9633 7036 (work)
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