Re: [Bug-gnubg] Some positions in the benchmark database

[Achim Mueller]

Ok, I'll give it a try without taking a look at any gnubg analysis.

* Øystein Johansen <address@hidden> [070619 20:36]:
> Hi all.
> 
> I'm browsing through some positions in the benchmark database, and some
> of the positions are really wired. I sometimes find positions where I
> really believe the rollout don't find the right move. Can anyone comment
> on these positions?
> 
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  | O     X  O  O  O |   | O  X  X  X  O  O |
>  | O     X  O  O    |   | O  X  X  X     O |
>  |       X     O    |   |    X  X          |
>  |                  |   |    X  X          |
>  |                  |   |    X             |
> v|                  |BAR|                  |
>  |                  |   |                  |
>  |                  |   |                  |
>  |                  |   |                  |
>  | O                |   |                  |
>  | O                |   |    X             |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Joseph-ID: ALOLMGAGAABAIAIDOPAN
> X to play 66.

A few general considerations to the position:
- o has three nearly dead checkers on his 2- and 1-point.
- besides his 8-point o has a ultimate stripped position and will most
  likely leave shots within the next 3 or 4 rolls
- getting hit is obviously not decisive

- x has too many spare checkers on point 20/21 and will loose
  flexibility if only te checkers on the 15-point can move freely.
- x first goal should be getting more control of both outfields before
  he hits a potential blot of o.
- x should not consider covering the blot on his 5-point in the near
  future

My first choice would be something like 20/14(3), 21/15 to switch some
spares into o's outfield. In general I'd strive for a classical prime vs
prime position (as x), because of the three dead checker of o.


 
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  |             X    |   |          O  X    |
>  |                  |   |                  |
>  |                  |   |                  |
>  |                  |   |                  |
>  |                  |   |                  |
> v|                  |BAR|                  |
>  |                  |   |       6          |
>  |                  |   |    X  X  O  O    |
>  |                  |   |    X  X  O  O    |
>  |             O  O |   | X  X  X  O  O  O |
>  | X           O  O |   | X  X  X  O  O  O |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Joseph-ID: AEAADGLMDHPILNIBCABA
> X to play 51.

x should not hit the checker on the 22-point. That checker is badly
placed at least for now. I'd either make the 12-point (17/12, 5/4) and 
wait for the remaining checker coming nearer to home or move 12/6.

Ciao

Achim