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interests / rec.games.backgammon / Gammon go play

SubjectAuthor
* Gammon go playTimothy Chow
+- Rollout: Gammon go playTimothy Chow
`- Re: Gammon go playah...Clem

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Gammon go play

<tqm5t9$3ldqs$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Gammon go play
Date: Mon, 23 Jan 2023 09:34:18 -0500
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 by: Timothy Chow - Mon, 23 Jan 2023 14:34 UTC

XGID=--aB-BC-a---bEb-Bb-c-b-b-A:0:0:1:63:0:1:1:2:10

Score is X:0 O:1 2 pt.(s) match.
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O X O | | O O O |
| X O X O | | O O O |
| X | | O |
| X | | |
| X | X | |
| |BAR| |
| | | |
| | | |
| | | X |
| O | | X X X |
| O O | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 156 O: 134 X-O: 0-1/2 Crawford
Cube: 1
X to play 63

---
Tim Chow

Rollout: Gammon go play

<tqrc2k$md7t$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Gammon go play
Date: Wed, 25 Jan 2023 08:50:12 -0500
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 by: Timothy Chow - Wed, 25 Jan 2023 13:50 UTC

XGID=--aB-BC-a---bEb-Bb-c-b-b-A:0:0:1:63:0:1:1:2:10

Score is X:0 O:1 2 pt.(s) match.
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O X O | | O O O |
| X O X O | | O O O |
| X | | O |
| X | | |
| X | X | |
| |BAR| |
| | | |
| | | |
| | | X |
| O | | X X X |
| O O | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 156 O: 134 X-O: 0-1/2 Crawford
Cube: 1
X to play 63

The score certainly makes a huge difference here. According to XG,
bar/16 is mandatory at a normal score, and is essentially tied with
bar/22 13/7 at DMP, but bar/22 13/7 is mandatory at GG.

1. Rollout¹ Bar/22 13/7 eq:+0.079
Player: 41.51% (G:12.46% B:0.71%)
Opponent: 58.49% (G:24.66% B:2.05%)
Confidence: ±0.007 (+0.072..+0.087) - [100.0%]

2. Rollout¹ Bar/16 eq:-0.020 (-0.099)
Player: 40.51% (G:8.49% B:0.75%)
Opponent: 59.49% (G:12.33% B:0.47%)
Confidence: ±0.007 (-0.027..-0.013) - [0.0%]

¹ 1296 Games rolled with Variance Reduction.
Dice Seed: 271828
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2

---
Tim Chow

Re: Gammon go play

<tr36q1$1mt7v$1@dont-email.me>

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From: ah_c...@ymail.com (ah...Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Gammon go play
Date: Sat, 28 Jan 2023 08:09:19 -0500
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 by: ah...Clem - Sat, 28 Jan 2023 13:09 UTC

On 1/23/2023 9:34 AM, Timothy Chow wrote:
> XGID=--aB-BC-a---bEb-Bb-c-b-b-A:0:0:1:63:0:1:1:2:10
>
> Score is X:0 O:1 2 pt.(s) match.
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  | X  O     X  O    |   | O     O     O    |
>  | X  O     X  O    |   | O     O     O    |
>  | X                |   | O                |
>  | X                |   |                  |
>  | X                | X |                  |
>  |                  |BAR|                  |
>  |                  |   |                  |
>  |                  |   |                  |
>  |                  |   | X                |
>  | O                |   | X  X     X       |
>  | O           O    |   | X  X     X  O    |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 156  O: 134 X-O: 0-1/2 Crawford
> Cube: 1
> X to play 63

bar/16 is the obvious play. Even though X is behind in the race, there
seems to be enough contact to escape the runner.

Is the bot play 13/7? Bring another checker into the zone to facilitate
a blitz? With only eight checkers in the zone? Not seeing it.

bar/16.

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