Re: [Bug-gnubg] Race position theoretical question?

[Øystein Schønning-Johansen]

Yes! This position actually proves that there are positions that can both loose backgammon and still be won. X can get all his checkers off in 15 rolls (with only 6-6 rolls), while O also may use 15 rolls to get off all checkers. Based on this example, I actually guess there are several positions with this property.

Josephs position also work, but it has to be the race leading player on roll. 

Thanks guys,

-Øystein

On Tue, Jan 29, 2019 at 9:46 PM Philippe Michel <address@hidden> wrote:

On Tue, Jan 29, 2019 at 08:00:22PM +0100, Øystein Schønning-Johansen wrote:
> Hi all!
>
> Here is a theoretical question for all of you:
>
> Can a race (aka. non-contact) position, be possible to lose backgammon with
> a good dash of unluck, and still be possible to win (with a good dash of
> luck).

Something like this ?

 GNU Backgammon  Position ID: /P8BAAAAAPD/Bw
                 Match ID   : UQkAAAAAAAAA
 +13-14-15-16-17-18------19-20-21-22-23-24-+     O: GNUbg
 |                  |   |       X  O       |     0 points
 |                  |   |       X  O       |     
 |                  |   |       X  O       |     
 |                  |   |       X  O       |     
 |                  |   |       F  F       |   
v|                  |BAR|                  |     
 |                  |   |                  |   
 |                  |   |                  |     
 |                  |   |                  |     
 |                  |   |                  |     On roll
 |                  |   |                  |     0 points
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     X: You (Cube: 2)
                    Pip counts : O 45, X 315

X wins if he rolls only 6-6s and O only 2-1s, and loses a backgammon if
he is moderately unlucky.