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interests / rec.games.backgammon / The woes of an inflexible position

SubjectAuthor
* The woes of an inflexible positionTimothy Chow
+- Re: The woes of an inflexible positionah....Clem
`- Rollout: The woes of an inflexible positionTimothy Chow

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The woes of an inflexible position

<tdvvu0$2lvtn$1@dont-email.me>

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https://www.novabbs.com/interests/article-flat.php?id=9520&group=rec.games.backgammon#9520

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Path: i2pn2.org!i2pn.org!eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: The woes of an inflexible position
Date: Mon, 22 Aug 2022 09:22:05 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Mon, 22 Aug 2022 13:22 UTC

XGID=--aaC-C-D-B-ba-A--bdb-b-B-:1:1:1:65:0:0:0:0:10

X:Player 1 O:Player 2
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O X O | | O O O X |
| O | | O O O X |
| | | O |
| | | O |
| | | |
| |BAR| |
| | | |
| X | | |
| X | | X X | +---+
| O X X | | X X | | 2 |
| O X X | | X X O O | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 145 O: 137 X-O: 0-0
Cube: 2, X own cube
X to play 65

---
Tim Chow

Re: The woes of an inflexible position

<te0kom$2o4di$1@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: The woes of an inflexible position
Date: Mon, 22 Aug 2022 15:17:41 -0400
Organization: The Future Fair
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 by: ah....Clem - Mon, 22 Aug 2022 19:17 UTC

On 8/22/2022 9:22 AM, Timothy Chow wrote:
> XGID=--aaC-C-D-B-ba-A--bdb-b-B-:1:1:1:65:0:0:0:0:10
>
> X:Player 1   O:Player 2
> Score is X:0 O:0. Unlimited Game
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  | O     X        O |   | O  O     O     X |
>  |                O |   | O  O     O     X |
>  |                  |   | O                |
>  |                  |   | O                |
>  |                  |   |                  |
>  |                  |BAR|                  |
>  |                  |   |                  |
>  |             X    |   |                  |
>  |             X    |   | X     X          | +---+
>  | O     X     X    |   | X     X          | | 2 |
>  | O     X     X    |   | X     X  O  O    | +---+
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 145  O: 137 X-O: 0-0
> Cube: 2, X own cube
> X to play 65
What's the game plan? It's not to race since we're behind. 15/4 is
safe, but inflexible.

Loose hits are problematic since we're outboarded, but 15/10 8/2* looks
playable, as does 15/9 8/3*.

Hittins two seems too loose as does slotting the five point since
there's no good six to be had.

I'll hit loose on the two and safety the outfield blot. The three is
usually the better hit, but with her strong board 15/10 should lose
fewer gammons.

15/10 8/2*

Ah....Clem
The future is fun, the future is fair.

Rollout: The woes of an inflexible position

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: The woes of an inflexible position
Date: Wed, 24 Aug 2022 07:46:54 -0400
Organization: A noiseless patient Spider
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In-Reply-To: <tdvvu0$2lvtn$1@dont-email.me>
 by: Timothy Chow - Wed, 24 Aug 2022 11:46 UTC

XGID=--aaC-C-D-B-ba-A--bdb-b-B-:1:1:1:65:0:0:0:0:10

X:Player 1 O:Player 2
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O X O | | O O O X |
| O | | O O O X |
| | | O |
| | | O |
| | | |
| |BAR| |
| | | |
| X | | |
| X | | X X | +---+
| O X X | | X X | | 2 |
| O X X | | X X O O | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 145 O: 137 X-O: 0-0
Cube: 2, X own cube
X to play 65

XG hits twice. It does lose more gammons than hitting once, but it
also wins more games and gammons. The safer plays don't have as much
upside---even if X is not hit back, they don't do a lot to solve X's
problems.

1. Rollout¹ 8/3* 8/2* eq:-0.283
Player: 36.95% (G:15.63% B:0.94%)
Opponent: 63.05% (G:28.37% B:4.03%)
Confidence: ±0.011 (-0.294..-0.272) - [100.0%]

2. Rollout¹ 15/9 8/3* eq:-0.380 (-0.098)
Player: 33.00% (G:11.39% B:0.65%)
Opponent: 67.00% (G:25.84% B:2.77%)
Confidence: ±0.010 (-0.390..-0.371) - [0.0%]

3. Rollout¹ 15/10 8/2* eq:-0.417 (-0.134)
Player: 30.65% (G:9.94% B:0.43%)
Opponent: 69.35% (G:22.83% B:1.65%)
Confidence: ±0.009 (-0.427..-0.408) - [0.0%]

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

eXtreme Gammon Version: 2.19.207.pre-release

---
Tim Chow

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