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interests / rec.games.backgammon / Early game 32

SubjectAuthor
* Early game 32Timothy Chow
+- Re: Early game 32ah....Clem
`- Rollout: Early game 32Timothy Chow

1
Early game 32

<tbgqmd$3sgrk$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Early game 32
Date: Sat, 23 Jul 2022 08:48:11 -0400
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 by: Timothy Chow - Sat, 23 Jul 2022 12:48 UTC

XGID=-a-a--EBB---dD---bbcb---B-:0:0:1:32:0:0:0:0:10

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-+
| X O O | | O O X |
| X O O | | O O X |
| X | | O |
| X | | |
| | | |
| |BAR| |
| | | X |
| O | | X |
| O | | X |
| O X X | | X |
| O X X | | X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 160 O: 156 X-O: 0-0
Cube: 1
X to play 32

---
Tim Chow

Re: Early game 32

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Early game 32
Date: Sun, 24 Jul 2022 16:57:46 -0400
Organization: The Future Fair
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 by: ah....Clem - Sun, 24 Jul 2022 20:57 UTC

On 7/23/2022 8:48 AM, Timothy Chow wrote:
> XGID=-a-a--EBB---dD---bbcb---B-:0:0:1:32:0:0:0:0:10
>
> 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-+
>  | X           O  O |   | O  O           X |
>  | X           O  O |   | O  O           X |
>  | X                |   | O                |
>  | X                |   |                  |
>  |                  |   |                  |
>  |                  |BAR|                  |
>  |                  |   | X                |
>  | O                |   | X                |
>  | O                |   | X                |
>  | O           X  X |   | X                |
>  | O           X  X |   | X        O     O |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 160  O: 156 X-O: 0-0
> Cube: 1
> X to play 32

Splitting seems thematic. But whacking both has its merits too. The
chicken play seems weak. The hybrid plays 6/3* 24/22 and 6/3* 13/11 are
intriguing too.

Hitting (one checker) loose seems to lack enough follow-on, but may well
be the bot play. I'll go for the simple split since I have a hunch it's
not all that wrong if not best. 24/21 13/11.

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

Rollout: Early game 32

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Early game 32
Date: Mon, 25 Jul 2022 09:04:42 -0400
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 by: Timothy Chow - Mon, 25 Jul 2022 13:04 UTC

XGID=-a-a--EBB---dD---bbcb---B-:0:0:1:32:0:0:0:0:10

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-+
| X O O | | O O X |
| X O O | | O O X |
| X | | O |
| X | | |
| | | |
| |BAR| |
| | | X |
| O | | X |
| O | | X |
| O X X | | X |
| O X X | | X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 160 O: 156 X-O: 0-0
Cube: 1
X to play 32

In his response, ah_clem mentioned many candidates, but not the bot play
of 24/22 24/21. This sort of play reminds me of former chess world
champion Mikhail Tal, who was famous for leaving multiple pieces en
prise (vulnerable to capture). He would say, "They can take only one
piece at a time!" In backgammon, some rolls actually allow O to hit
(or even point on) both of X's blots after 24/22 24/21, but most do not.
If only one checker is hit, X may escape, or anchor on, the other one.

1. Rollout¹ 24/22 24/21 eq:-0.445
Player: 40.31% (G:9.54% B:0.45%)
Opponent: 59.69% (G:20.32% B:0.70%)
Confidence: ±0.013 (-0.458..-0.432) - [100.0%]

2. Rollout¹ 24/21 13/11 eq:-0.532 (-0.087)
Player: 37.60% (G:9.16% B:0.41%)
Opponent: 62.40% (G:19.05% B:1.02%)
Confidence: ±0.019 (-0.551..-0.513) - [0.0%]

3. Rollout¹ 24/22 6/3* eq:-0.577 (-0.132)
Player: 36.23% (G:8.67% B:0.36%)
Opponent: 63.77% (G:18.19% B:0.95%)
Confidence: ±0.017 (-0.594..-0.560) - [0.0%]

4. Rollout¹ 24/22 13/10 eq:-0.600 (-0.155)
Player: 35.97% (G:8.48% B:0.35%)
Opponent: 64.03% (G:19.48% B:0.99%)
Confidence: ±0.013 (-0.613..-0.587) - [0.0%]

5. Rollout¹ 6/3* 3/1* eq:-0.660 (-0.214)
Player: 34.06% (G:9.31% B:0.26%)
Opponent: 65.94% (G:19.61% B:1.08%)
Confidence: ±0.015 (-0.675..-0.645) - [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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