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interests / rec.games.backgammon / Rollout: Bar point or anchor?

SubjectAuthor
* Bar point or anchor?Timothy Chow
+- Re: Bar point or anchor?ah...Clem
`- Rollout: Bar point or anchor?Timothy Chow

1
Bar point or anchor?

<u7ju05$25hi1$2@dont-email.me>

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Path: i2pn2.org!i2pn.org!eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Bar point or anchor?
Date: Thu, 29 Jun 2023 08:38:28 -0400
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 by: Timothy Chow - Thu, 29 Jun 2023 12:38 UTC

XGID=-A--aaD-DA--cC---c-eb-A-A-:0:0:1:62:0:0:0:0:10

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 X |
| X O | | O O |
| X O | | O |
| | | O |
| | | O |
| |BAR| |
| | | |
| X | | X |
| O X | | X |
| O X | | X |
| O X X | | X O O X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 151 O: 144 X-O: 0-0
Cube: 1
X to play 62

---
Tim Chow

Re: Bar point or anchor?

<u7k3il$23u9a$1@dont-email.me>

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From: ah_c...@ymail.com (ah...Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Bar point or anchor?
Date: Thu, 29 Jun 2023 10:13:39 -0400
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 by: ah...Clem - Thu, 29 Jun 2023 14:13 UTC

On 6/29/2023 8:38 AM, Timothy Chow wrote:
> XGID=-A--aaD-DA--cC---c-eb-A-A-:0:0:1:62:0:0:0:0:10
>
> 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     X |
>  | X           O    |   | O  O             |
>  | X           O    |   | O                |
>  |                  |   | O                |
>  |                  |   | O                |
>  |                  |BAR|                  |
>  |                  |   |                  |
>  |             X    |   | X                |
>  | O           X    |   | X                |
>  | O           X    |   | X                |
>  | O        X  X    |   | X  O  O        X |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 151  O: 144 X-O: 0-0
> Cube: 1
> X to play 62

After making the anchor, how do we play the six? 9/3 buries a second
checker, as does 8//2. 13/7 is way too loose.

Maybe make the ace point instead? Modern play says once you slot it, go
ahead and make it, so it might be the bot play. I get dinged a lot
because I'm reluctant to play to the ace (because is is wrong so often)

I'll make the bar here. Seems like a fairly normal thing to do and
maybe the bots will agree with me. Safety the blot that currently faces
a double shot and make a permanent asset. It does leave our points
stacked and stripped, but I'm not seeing that as enough of a liability
to make the anchor or the ace.

Rollout: Bar point or anchor?

<u7p8la$2uaqp$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Bar point or anchor?
Date: Sat, 1 Jul 2023 09:11:05 -0400
Organization: A noiseless patient Spider
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In-Reply-To: <u7ju05$25hi1$2@dont-email.me>
 by: Timothy Chow - Sat, 1 Jul 2023 13:11 UTC

XGID=-A--aaD-DA--cC---c-eb-A-A-:0:0:1:62:0:0:0:0:10

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 X |
| X O | | O O |
| X O | | O |
| | | O |
| | | O |
| |BAR| |
| | | |
| X | | X |
| O X | | X |
| O X | | X |
| O X X | | X O O X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 151 O: 144 X-O: 0-0
Cube: 1
X to play 62

With O having 10 checkers stacked up in the zone and X having a weak
board, making a defensive anchor is imperative, even though the 6 is
awkward.

1. Rollout¹ 24/22 9/3 eq:-0.415
Player: 38.68% (G:7.15% B:0.14%)
Opponent: 61.32% (G:10.09% B:0.42%)
Confidence: ±0.011 (-0.426..-0.404) - [100.0%]

2. Rollout¹ 9/1 eq:-0.521 (-0.105)
Player: 37.60% (G:9.78% B:0.27%)
Opponent: 62.40% (G:19.70% B:0.72%)
Confidence: ±0.012 (-0.533..-0.508) - [0.0%]

3. Rollout¹ 13/7 9/7 eq:-0.564 (-0.149)
Player: 36.94% (G:9.56% B:0.33%)
Opponent: 63.06% (G:21.13% B:0.89%)
Confidence: ±0.017 (-0.580..-0.547) - [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

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