RE: [Bug-gnubg] Post-Crawford 2-away opening 41 for leader

[Ian Shaw]

> -----Original Message-----
> From: Nardy Pillards [mailto:address@hidden

> 
> > GnuBg thinks that after an opening 41, Leader should use 
> the free drop.
> > However, if I give Leader the cube on 2, GnuBg says that 
> Leader is over
> 50% to win. If this is the case, then Leader should be taking.
> > My test does not change the depth of the search, so what is 
> going on?
> >
> >     GNU Backgammon  Position ID: 4HPwATDgc/ABMA
> >                     Match ID   : MAFGABAAAAAA
> >     +-1--2--3--4--5--6-------7--8--9-10-11-12-+  O: Leader
> >     | X              O |   |    O           X |  1 point
> >     | X              O |   |    O           X |  Rolled 41
> >     |                O |   |    O           X |
> >     |                O |   |                X |
> >     |                O |   |                X |
> >     |                  |BAR|                  |^ 2 point 
> match (Cube: 1)
> >     |                X |   |                O |
> >     |                X |   |                O |
> >     |                X |   |    X           O |
> >     | O              X |   |    X           O |
> >     | O              X |   |    X           O |  0 points
> >     +24-23-22-21-20-19------18-17-16-15-14-13-+  X: Trailer
> 
> Just a remark:
> This position shows a 2 point match, score 1-0.
> That has to be a Crawford game, no doubling possible.
> (I don't think this can be a 2-away post Crawford)
> 

Setting Crawford changes the first letter of the match ID to "s" (see below), 
so I'm sure I'd set it to post-Crawford. However, it would be more obvious if 
the "(Cube: 1)" read "(Crawford game)", and under the "2 point match" to save 
space.

    GNU Backgammon  Position ID: 4HPwATDgc/ABMA
                    Match ID   : sAFGABAAAAAA
    +-1--2--3--4--5--6-------7--8--9-10-11-12-+  O: Leader
    | X              O |   |    O           X |  1 point
    | X              O |   |    O           X |  Rolled 41
    |                O |   |    O           X |  
    |                O |   |                X |  
    |                O |   |                X |  
    |                  |BAR|                  |^ 2 point match (Cube: 1)
    |                X |   |                O |  
    |                X |   |                O |  
    |                X |   |    X           O |  
    | O              X |   |    X           O |  
    | O              X |   |    X           O |  0 points
    +24-23-22-21-20-19------18-17-16-15-14-13-+  X: Trailer

--Ian