Breaking the 6-point
dar...@aaii.oz.au
SnowWhite must be a good player - it was in the top 10 last time I looked.
Perhaps this is one of those moves which distinguishes it from the humans:
13 14 15 16 17 18 19 20 21 22 23 24
+------------------------------------------+ X: SnowWhite - score: 3
| O X X X | | X X X O O |
| O X X | | X X X |
| O | | |
| O | | |
| | | |
v| |BAR| | 5-point match
| | | |
| | | |
| | | |
| X O | | O O O |
| X X O | O | O X O O |
+------------------------------------------+ O: Rourke - score: 1
12 11 10 9 8 7 6 5 4 3 2 1
BAR: O-1 X-0 OFF: O-0 X-0 Cube: 1 turn: SnowWhite
>
SnowWhite rolls 4 and 4.
Think about it for a moment ...
SnowWhite moves 2(19/23) 18/22 8/12 !!! Leaving a shot, a three-point
homeboard, and a vacant 6-point. With three of mine on the bar, of course.
Can you imagine yourself playing this? Can you imagine defending it in a
chouette? Would they all laugh at you? (Do they do that anyway? ... but
that's another story ...) You would have been crucified by them when I
threw that 6-6 next roll. I still managed to lose, unfortunately.
So, can we have another bot's view? What does Jellyfish think of all this?
Do any of you human experts ever break the 6-point in situations like
this, where there's a lot of play spread round the board? Will you from
now on if JF agrees?
Wow, you see something new on a BG board every day.
--
... Rourke on FIBS ... http://www.aaii.oz.au/staff/darren/ozibg/
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John Greenwood
dar...@aaii.oz.au wrote:
>SnowWhite must be a good player - it was in the top 10 last time I looked.
>Perhaps this is one of those moves which distinguishes it from the humans:
> 13 14 15 16 17 18 19 20 21 22 23 24
> +------------------------------------------+ X: SnowWhite - score: 3
> | O X X X | | X X X O O |
> | O X X | | X X X |
> | O | | |
> | O | | |
> | | | |
> v| |BAR| | 5-point match
> | | | |
> | | | |
> | | | |
> | X O | | O O O |
> | X X O | O | O X O O |
> +------------------------------------------+ O: Rourke - score: 1
> 12 11 10 9 8 7 6 5 4 3 2 1
> BAR: O-1 X-0 OFF: O-0 X-0 Cube: 1 turn: SnowWhite
>>
>SnowWhite rolls 4 and 4.
>Think about it for a moment ...
>SnowWhite moves 2(19/23) 18/22 8/12 !!! Leaving a shot, a three-point
>homeboard, and a vacant 6-point. With three of mine on the bar, of course.
>Can you imagine yourself playing this? Can you imagine defending it in a
>chouette? Would they all laugh at you? (Do they do that anyway? ... but
>that's another story ...) You would have been crucified by them when I
>threw that 6-6 next roll. I still managed to lose, unfortunately.
>So, can we have another bot's view? What does Jellyfish think of all this?
Jellyfish 3.0 plays this move from level 4 upwards. At levels 1 to3 it
settles for 8/20, 18/22*
An interesting side note is the level 7 equity estimates are -0.852
and -0.849 at this score (with volatiltilties of 0.36 and 0.28) but
the best move is more favourable at lower match scores for X as the
backgammon becomes worth winning and the equity estimate for the
underdog falls to -0.871 at a 2-1 score line.
JohnG
---
John Greenwood
jo...@johng.ftech.co.uk
http://www.ftech.net/~johng/
Brian Sheppard
John Greenwood <Jo...@johng.ftech.co.uk> wrote in article
<5pisni$46t$1...@alpha.ftech.net>...
> dar...@aaii.oz.au wrote:
> > 13 14 15 16 17 18 19 20 21 22 23 24
> > +------------------------------------------+ X: SnowWhite - score: 3
> > | O X X X | | X X X O O |
> > | O X X | | X X X |
> > | O | | |
> > | O | | |
> > v| |BAR| | 5-point match
> > | X O | | O O O |
> > | X X O | O | O X O O |
> > +------------------------------------------+ O: Rourke - score: 1
> > 12 11 10 9 8 7 6 5 4 3 2 1
>
> > BAR: O-1 X-0 OFF: O-0 X-0 Cube: 1 turn: SnowWhite
> >>
> >SnowWhite rolls 4 and 4.
>
> >homeboard, and a vacant 6-point. With three of mine on the bar, of
course.
>
> >Can you imagine yourself playing this?
Actually, yes. I think this is an automatic play. I would pause to
think about whether to play 8/12 or 16/20 or 5/9 or 12/16 or ...,
but the first three 4's are quite obvious.
This type of play is called a "wash." It is a standard blitzing
tactic.
Brian