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Re: [Bug-gnubg] Some positions in the benchmark database
From: |
David Montgomery |
Subject: |
Re: [Bug-gnubg] Some positions in the benchmark database |
Date: |
Wed, 20 Jun 2007 10:06:33 -0700 |
From: Achim Mueller <address@hidden>
>
> +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.
[...]
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.
I would make the same play. But I would be aiming at a distant
outside prime, from the 10-15 point, or further back if the 16 and 17
points become available.
> +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.
I'm really unsure about this. My first thought was 12/6.
But then I decided that I actually did want to hit. As O,
I would want to be diversifying my checkers and working
towards building up a blockade mostly in X's outer board.
By hitting as X, I prevent this, at least for now, which feels
like a good idea. My goal is to come home quickly and
get as many checkers off as I can before O's offense (the
outside prime) is in place. So I'll play 23/22* 17/12. I don't
really want the 12 point, but I don't want to get hit, either.
I don't know if any bot plays these positions even plausibly well.
Up into the early 2000's JellyFish was still the strongest available
program for positions with a developed outside prime. But 1) these
don't have the outside prime in place, so I don't know how good it
is; 2) JF wasn't that great, anyway -- the others were just horrible;
3) I haven't kept up with improvements to Snowie starting with v4,
so maybe it knows how to play these positions now.
David