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interests / rec.games.backgammon / Rollout: 4pt vs 7pt 5

SubjectAuthor
* 4pt vs 5pt 5Timothy Chow
+* Re: 4pt vs 5pt 5Bradley K. Sherman
|`- Re: 4pt vs 5pt 5Timothy Chow
+- Re: 4pt vs 5pt 5ah....Clem
`- Rollout: 4pt vs 7pt 5Timothy Chow

1
4pt vs 5pt 5

<u6hjps$qr9j$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: 4pt vs 5pt 5
Date: Fri, 16 Jun 2023 08:15:55 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Fri, 16 Jun 2023 12:15 UTC

XGID=--a--CC-CA-BbB---cbe-b-A--:0:0:1:21:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O O X |
| X O O | | O O |
| O | | O |
| | | O |
| | | O |
| |BAR| |
| | | |
| | | |
| X | | X X |
| O X X | | X X |
| O X X X | | X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 137 O: 125 X-O: 0-0
Cube: 1
X to play 21

---
Tim Chow

Re: 4pt vs 5pt 5

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From: bks...@panix.com (Bradley K. Sherman)
Newsgroups: rec.games.backgammon
Subject: Re: 4pt vs 5pt 5
Date: Fri, 16 Jun 2023 13:07:29 -0000 (UTC)
Organization: RNA + Sunlight
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 by: Bradley K. Sherman - Fri, 16 Jun 2023 13:07 UTC

Timothy Chow <tchow12000@yahoo.com> wrote:
>XGID=--a--CC-CA-BbB---cbe-b-A--:0:0:1:21:0:0:0:0:10
>
>Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | X O O | | O O X |
> | X O O | | O O |
> | O | | O |
> | | | O |
> | | | O |
> | |BAR| |
> | | | |
> | | | |
> | X | | X X |
> | O X X | | X X |
> | O X X X | | X X O |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
>Pip count X: 137 O: 125 X-O: 0-0
>Cube: 1
>X to play 21

I think the Subject line sould be "vs 7pt". And thanks
for all the examples. Do you find these by memory, or
do you keep a personal tagged database?

--bks

Re: 4pt vs 5pt 5

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: 4pt vs 5pt 5
Date: Fri, 16 Jun 2023 18:44:30 -0400
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 by: ah....Clem - Fri, 16 Jun 2023 22:44 UTC

On 6/16/2023 8:15 AM, Timothy Chow wrote:
> XGID=--a--CC-CA-BbB---cbe-b-A--:0:0:1:21:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  | X           O  O |   | O     O     X    |
>  | X           O  O |   | O     O          |
>  |             O    |   | O                |
>  |                  |   | O                |
>  |                  |   | O                |
>  |                  |BAR|                  |
>  |                  |   |                  |
>  |                  |   |                  |
>  |             X    |   | X  X             |
>  | O  X        X    |   | X  X             |
>  | O  X     X  X    |   | X  X        O    |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 137  O: 125 X-O: 0-0
> Cube: 1
> X to play 21

I'll make the bar point to block sixes and create a solid four prime.

Not sure I understand these positions at all...

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

Re: 4pt vs 5pt 5

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Re: 4pt vs 5pt 5
Date: Sat, 17 Jun 2023 08:42:32 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Sat, 17 Jun 2023 12:42 UTC

On 6/16/2023 9:07 AM, Bradley K. Sherman wrote:

> I think the Subject line sould be "vs 7pt".

LOL. Yes!

> Do you find these by memory, or
> do you keep a personal tagged database?

They're in a database. Or rather, I have a large collection of
positions arranged into folders and subfolders. I have a folder
for the 4pt and a subfolder for the 7pt.

---
Tim Chow

Rollout: 4pt vs 7pt 5

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: 4pt vs 7pt 5
Date: Sun, 18 Jun 2023 09:28:10 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Sun, 18 Jun 2023 13:28 UTC

XGID=--a--CC-CA-BbB---cbe-b-A--:0:0:1:21:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O O X |
| X O O | | O O |
| O | | O |
| | | O |
| | | O |
| |BAR| |
| | | |
| | | |
| X | | X X |
| O X X | | X X |
| O X X X | | X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 137 O: 125 X-O: 0-0
Cube: 1
X to play 21

By now the heuristic "attack with the 4pt, prime with the 7pt" seems
to be taking shape, but which one is this? XG makes the 4pt, which
makes some sense since O has a blot, but see also the variant, where
O's blot has been moved back 1 pip.

1. Rollout¹ 6/4 5/4 eq:+0.117
Player: 54.46% (G:12.73% B:0.53%)
Opponent: 45.54% (G:14.91% B:0.42%)
Confidence: ±0.014 (+0.104..+0.131) - [100.0%]

2. Rollout¹ 9/7 8/7 eq:+0.037 (-0.080)
Player: 51.83% (G:11.38% B:0.45%)
Opponent: 48.17% (G:14.56% B:0.43%)
Confidence: ±0.012 (+0.026..+0.049) - [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=-a---CC-CA-BbB---cbe-b-A--:0:0:1:21:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O O X |
| X O O | | O O |
| O | | O |
| | | O |
| | | O |
| |BAR| |
| | | |
| | | |
| X | | X X |
| O X X | | X X |
| O X X X | | X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 137 O: 126 X-O: 0-0
Cube: 1
X to play 21

1. Rollout¹ 6/4 5/4 eq:+0.078
Player: 53.44% (G:12.66% B:0.53%)
Opponent: 46.56% (G:15.02% B:0.44%)
Confidence: ±0.013 (+0.065..+0.090) - [95.5%]

2. Rollout¹ 9/7 8/7 eq:+0.062 (-0.016)
Player: 52.45% (G:11.57% B:0.49%)
Opponent: 47.55% (G:14.84% B:0.42%)
Confidence: ±0.014 (+0.048..+0.075) - [4.5%]

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

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