Re: [Bug-gnubg] never too good?

[Joseph Heled]

Øystein O Johansen wrote:
> 
> > Your opponent has borne out at least one
> > one. It is possible the positions is no-double,
> > double/take and double/drop.
> > But can it ever be too-good-to-double/drop?
> 
> Yes, I think you're right. These are the only
> three cube decisions that makes sense. Valid for
> money game and match play. I can't think of any
> known paradoxes that invalidates the statment
> either.
> 
> -Øystein
 
This is the position that prompted my temporary self doubt. (number 55 in
doubles.dat 0000)

 GNU Backgammon  Position ID: BgAC2HZ7AAAEAA
                 Match ID   : MAGgAAAAAAAA
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     O: gnubg
 |          X       |   |    O  O  O  O  O | O   0 points
 |                  |   |    O  O  O  O  O |     On roll
 |                  |   |    O     O       |     
 |                  |   |    O             |     
 |                  |   |                  |    
^|                  |BAR|                  |     5 point match (Cube: 1)
 |                  |   |                  | XX 
 |                  |   |                  | XX  
 |                  |   |                  | XX  
 |                  | X |             X    | XX  
 |                  | X |             X  O | XX  0 points
 +13-14-15-16-17-18------19-20-21-22-23-24-+     X: joseph
 
My cubefull rollout gave 
  ND  59.428%
  D/T 59.754%

With D/D 57.5%, this is strange. Without gammons/bg's, ND should be <= D/D.
I think this means X is making a great number of bad takes, or in other words,
this position (and others like it) are a good source for finding positions where
GNUbg makes cube errors.

-Joseph