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interests / rec.games.backgammon / Is this a backgame?

SubjectAuthor
* Is this a backgame?Timothy Chow
+* Re: Is this a backgame?Stick Rice
|`- Re: Is this a backgame?Frank Berger
`- Rollout: Is this a backgame?Timothy Chow

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Is this a backgame?

<uh8enm$3suc5$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Is this a backgame?
Date: Tue, 24 Oct 2023 08:53:09 -0400
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 by: Timothy Chow - Tue, 24 Oct 2023 12:53 UTC

XGID=---b-bE-C-B-bD---bbd-A-a--:0:0:1:54:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O X O |
| X O O | | O |
| X | | O |
| X | | O |
| | | |
| |BAR| |
| | | X |
| | | X |
| X | | X |
| O X X | | X O O |
| O X X | | X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 147 O: 166 X-O: 0-0
Cube: 1
X to play 54

---
Tim Chow

Re: Is this a backgame?

<dacd355a-bd0c-472e-8545-a72f9e34a436n@googlegroups.com>

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Subject: Re: Is this a backgame?
From: bananabo...@gmail.com (Stick Rice)
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 by: Stick Rice - Tue, 24 Oct 2023 17:38 UTC

On Tuesday, October 24, 2023 at 8:53:12 AM UTC-4, Timothy Chow wrote:
> XGID=---b-bE-C-B-bD---bbd-A-a--:0:0:1:54:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | X O O | | O X O |
> | X O O | | O |
> | X | | O |
> | X | | O |
> | | | |
> | |BAR| |
> | | | X |
> | | | X |
> | X | | X |
> | O X X | | X O O |
> | O X X | | X O O |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 147 O: 166 X-O: 0-0
> Cube: 1
> X to play 54
>
> ---
> Tim Chow

No.

Stick

Re: Is this a backgame?

<5908040f-b952-401e-80d0-d2d19b740d6bn@googlegroups.com>

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Subject: Re: Is this a backgame?
From: bgblit...@googlemail.com (Frank Berger)
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 by: Frank Berger - Wed, 25 Oct 2023 10:56 UTC

The points are unusual high and it lacks a race deficit.
Maybe this is a backgame: XGID=---bBbDBC-B-bB---bbd---a--:0:0:1:54:2:4:0:11:10

Rollout: Is this a backgame?

<uhfb5j$239g4$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Is this a backgame?
Date: Thu, 26 Oct 2023 23:35:13 -0400
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 by: Timothy Chow - Fri, 27 Oct 2023 03:35 UTC

XGID=---b-bE-C-B-bD---bbd-A-a--:0:0:1:54:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O X O |
| X O O | | O |
| X | | O |
| X | | O |
| | | |
| |BAR| |
| | | X |
| | | X |
| X | | X |
| O X X | | X O O |
| O X X | | X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 147 O: 166 X-O: 0-0
Cube: 1
X to play 54

I didn't like the look of 6/2 but XG thinks that anything other than
21/16 6/2 is horrible. Changing the spare distribution makes some
difference, but not enough to swing the play.

1. Rollout¹ 21/16 6/2 eq:+0.425
Player: 61.20% (G:11.39% B:0.37%)
Opponent: 38.80% (G:8.78% B:0.26%)
Confidence: ±0.014 (+0.410..+0.439) - [100.0%]

2. Rollout¹ 13/8 6/2 eq:+0.292 (-0.133)
Player: 57.39% (G:13.47% B:0.50%)
Opponent: 42.61% (G:11.23% B:0.28%)
Confidence: ±0.016 (+0.275..+0.308) - [0.0%]

3. Rollout¹ 21/16 13/9 eq:+0.262 (-0.163)
Player: 57.29% (G:12.01% B:0.48%)
Opponent: 42.71% (G:11.36% B:0.39%)
Confidence: ±0.015 (+0.247..+0.276) - [0.0%]

4. Rollout¹ 21/16 8/4 eq:+0.256 (-0.168)
Player: 57.69% (G:11.43% B:0.46%)
Opponent: 42.31% (G:11.83% B:0.37%)
Confidence: ±0.015 (+0.242..+0.271) - [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

-------
Variant
-------

XGID=---b-bD-D-B-bD---bbd-A-a--:0:0:1:54:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O X O |
| X O O | | O |
| X | | O |
| X | | O |
| | | |
| |BAR| |
| | | |
| X | | X |
| X | | X |
| O X X | | X O O |
| O X X | | X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 149 O: 166 X-O: 0-0
Cube: 1
X to play 54

1. Rollout¹ 21/16 6/2 eq:+0.416
Player: 61.26% (G:10.78% B:0.39%)
Opponent: 38.74% (G:8.67% B:0.26%)
Confidence: ±0.019 (+0.396..+0.435) - [100.0%]

2. Rollout¹ 21/16 8/4 eq:+0.355 (-0.061)
Player: 59.96% (G:11.04% B:0.45%)
Opponent: 40.04% (G:10.03% B:0.26%)
Confidence: ±0.015 (+0.339..+0.370) - [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

---
Tim Chow

interests / rec.games.backgammon / Is this a backgame?

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