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Re: [Bug-gnubg] Some positions in the benchmark database
From: |
Achim Mueller |
Subject: |
Re: [Bug-gnubg] Some positions in the benchmark database |
Date: |
Wed, 20 Jun 2007 14:16:40 +0200 |
User-agent: |
Mutt/1.5.9i |
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