RE: [Bug-gnubg] 1-chequer hypergammon

[Ian Shaw]

> -----Original Message-----
> From: Ned Cross
> 
> That either side has a nonzero probability of winning 
> backgammon is simply
> wrong, since contact is broken and both sides have cleared 
> the enemy home
> board. Removing the BG probabilities should slightly alter 
> the equities.
> 
> 
There is still contact. X is at the bottom and heading left.
I don't think it's clear from the diagram that it was O who doubled.

> 
>     GNU Backgammon  Position ID: AAIAAAAIAAAAAA
>                     Match ID   : MBkAAIAAKAAA
>     +-1--2--3--4--5--6-------7--8--9-10-11-12-+  O: Leader
>     |                  |   |                  |  8 points
>     |                  |   |                  |
>     |                  |   |                  |
>     |                  |   |                  |
>     |                  |   |                  |
>     |                  |BAR|                  |^
>     |                  |   |                  |
>     |                  |   |                  |
>     |                  |   |                  |
>     |                  |   |                  |  Cube offered at 2
>     |                  |   | O        X       |  5 points
>     +24-23-22-21-20-19------18-17-16-15-14-13-+  X: Trailer
> 
> 
> Cube analysis
> 2-ply cubeless equity  +0.025
>   0.498 0.498 0.038 - 0.502 0.502 0.006
> Cubeful equities:
> 1. Double, take         -0.035
> 2. Double, pass         +1.000  ( +1.035)
> 3. No double            -0.049  ( -0.014)
> Proper cube action: Double, beaver
>