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interests / rec.games.backgammon / Early(ish) game checker play

SubjectAuthor
* Early(ish) game checker playTimothy Chow
+- Re: Early(ish) game checker playah....Clem
`- Rollout: Early(ish) game checker playTimothy Chow

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Early(ish) game checker play

<tj5vu9$1m4jc$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Early(ish) game checker play
Date: Mon, 24 Oct 2022 08:20:25 -0400
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 by: Timothy Chow - Mon, 24 Oct 2022 12:20 UTC

XGID=--a-BBC-----dE-a-c-d--b-BA:0:0:1:41:0:0:0:0:10

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 X |
| X O | | O |
| X | | O |
| X | X | |
| |BAR| |
| | | |
| O | | |
| O | | X |
| O | | X X X |
| O | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 174 O: 139 X-O: 0-0
Cube: 1
X to play 41

---
Tim Chow

Re: Early(ish) game checker play

<tj6klp$1noqm$1@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Early(ish) game checker play
Date: Mon, 24 Oct 2022 14:14:17 -0400
Organization: The Future Fair
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 by: ah....Clem - Mon, 24 Oct 2022 18:14 UTC

On 10/24/2022 8:20 AM, Timothy Chow wrote:
> XGID=--a-BBC-----dE-a-c-d--b-BA:0:0:1:41:0:0:0:0:10
>
> 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     X |
>  | X           O    |   | O                |
>  | X                |   | O                |
>  | X                | X |                  |
>  |                  |BAR|                  |
>  |                  |   |                  |
>  | O                |   |                  |
>  | O                |   | X                |
>  | O                |   | X  X  X          |
>  | O                |   | X  X  X     O    |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 174  O: 139 X-O: 0-0
> Cube: 1
> X to play 41

X can play bar/24 13/9 and bring a ninth checker into the zone in a
blitz-ish position, but I don't like the looks of three checkers on the
ace point this early in the game. O has ten in the zone so leaving three
blots in her home board seems too risky. That leaves 21/20 or 6/5 as the
ace if I enter with the four. Not sure which is better, but I'll go for
bar/20.

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

Rollout: Early(ish) game checker play

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Early(ish) game checker play
Date: Wed, 26 Oct 2022 08:33:05 -0400
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 by: Timothy Chow - Wed, 26 Oct 2022 12:33 UTC

XGID=--a-BBC-----dE-a-c-d--b-BA:0:0:1:41:0:0:0:0:10

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 X |
| X O | | O |
| X | | O |
| X | X | |
| |BAR| |
| | | |
| O | | |
| O | | X |
| O | | X X X |
| O | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 174 O: 139 X-O: 0-0
Cube: 1
X to play 41

XG strongly prefers to stack a third checker on the 24pt and hit loose
with only 7 checkers in the zone. This still looks unnatural to me, but
I interpret the play as a tempo hit. Given free rein, many of O's rolls
play well, letting her make a good point or run her last checker.

For comparison, see the variant.

1. Rollout¹ Bar/24 6/2* eq:-0.323
Player: 44.11% (G:12.19% B:0.42%)
Opponent: 55.89% (G:21.79% B:2.34%)
Confidence: ±0.016 (-0.339..-0.306) - [100.0%]

2. Rollout¹ Bar/20 eq:-0.405 (-0.082)
Player: 41.53% (G:10.82% B:0.41%)
Opponent: 58.47% (G:19.71% B:1.63%)
Confidence: ±0.014 (-0.419..-0.390) - [0.0%]

3. Rollout¹ Bar/21 24/23 eq:-0.409 (-0.087)
Player: 41.21% (G:10.66% B:0.39%)
Opponent: 58.79% (G:20.63% B:1.28%)
Confidence: ±0.014 (-0.423..-0.396) - [0.0%]

4. Rollout¹ Bar/21 6/5 eq:-0.432 (-0.109)
Player: 40.55% (G:10.45% B:0.37%)
Opponent: 59.45% (G:19.77% B:1.56%)
Confidence: ±0.016 (-0.448..-0.416) - [0.0%]

5. Rollout¹ Bar/24 13/9 eq:-0.461 (-0.139)
Player: 40.24% (G:11.06% B:0.40%)
Opponent: 59.76% (G:21.16% B:2.19%)
Confidence: ±0.018 (-0.480..-0.443) - [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--BBC-----dE-a-c-d--b-BA:0:0:1:51:0:0:0:0:10

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 X |
| X O | | O |
| X | | O |
| X | X | |
| |BAR| |
| | | |
| O | | |
| O | | X |
| O | | X X X |
| O | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 174 O: 140 X-O: 0-0
Cube: 1
X to play 51

1. XG Roller++ Bar/20 24/23 eq:-0.349
Player: 42.84% (G:10.83% B:0.38%)
Opponent: 57.16% (G:19.84% B:0.96%)

2. XG Roller++ Bar/20 6/5 eq:-0.356 (-0.007)
Player: 42.55% (G:10.41% B:0.32%)
Opponent: 57.45% (G:18.31% B:1.41%)

3. XG Roller++ Bar/24 13/8 eq:-0.404 (-0.055)
Player: 41.96% (G:10.39% B:0.35%)
Opponent: 58.04% (G:20.49% B:1.94%)

4. XG Roller++ Bar/24 6/1* eq:-0.442 (-0.093)
Player: 41.02% (G:11.21% B:0.31%)
Opponent: 58.98% (G:21.03% B:2.03%)

eXtreme Gammon Version: 2.19.211.pre-release

---
Tim Chow

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