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interests / rec.games.backgammon / Anchor or PoH?

SubjectAuthor
* Anchor or PoH?Timothy Chow
+- Re: Anchor or PoH?peps...@gmail.com
+- Re: Anchor or PoH?Robert Zimmerman
+- Rollout: Anchor or PoH?Timothy Chow
`- Re: Anchor or PoH?MK

1
Anchor or PoH?

<u2offa$6acm$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Anchor or PoH?
Date: Mon, 1 May 2023 09:39:54 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Mon, 1 May 2023 13:39 UTC

XGID=-a-a--E-CB--dC---cAdb--A--:0:0:1:53:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O X | | O O X |
| X O | | O O |
| X O | | O |
| | | O |
| | | |
| |BAR| |
| | | X |
| O | | X |
| O X | | 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: 152 O: 156 X-O: 0-0
Cube: 1
X to play 53

---
Tim Chow

Re: Anchor or PoH?

<ccd45627-4934-4c21-b443-4913bbb5c193n@googlegroups.com>

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Subject: Re: Anchor or PoH?
From: pepste...@gmail.com (peps...@gmail.com)
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 by: peps...@gmail.com - Mon, 1 May 2023 15:19 UTC

On Monday, May 1, 2023 at 2:39:57 PM UTC+1, Timothy Chow wrote:
> XGID=-a-a--E-CB--dC---cAdb--A--:0:0:1:53:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | X O X | | O O X |
> | X O | | O O |
> | X O | | O |
> | | | O |
> | | | |
> | |BAR| |
> | | | X |
> | O | | X |
> | O X | | 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: 152 O: 156 X-O: 0-0
> Cube: 1
> X to play 53
>
> ---
> Tim Chow
PoH for sure, but it's hard for me to justify it.
It's not as if anchoring is as senseless as
Norman Mailer.

Paul

Re: Anchor or PoH?

<fbc9c669-ed42-4851-badc-db5f95a8c884n@googlegroups.com>

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Subject: Re: Anchor or PoH?
From: zimbrook...@gmail.com (Robert Zimmerman)
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 by: Robert Zimmerman - Tue, 2 May 2023 01:48 UTC

On Monday, May 1, 2023 at 9:39:57 AM UTC-4, Timothy Chow wrote:
> XGID=-a-a--E-CB--dC---cAdb--A--:0:0:1:53:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | X O X | | O O X |
> | X O | | O O |
> | X O | | O |
> | | | O |
> | | | |
> | |BAR| |
> | | | X |
> | O | | X |
> | O X | | 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: 152 O: 156 X-O: 0-0
> Cube: 1
> X to play 53
>
> ---
> Tim Chow
Anchoring and PoH are close. To me, what breaks the tie is taking away a good 6 from O. So make the anchor. Then I'd hit as it unstacks the 6 point and doesn't strip the midpoint.
Bob

Rollout: Anchor or PoH?

<u2tkkf$19f8r$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Anchor or PoH?
Date: Wed, 3 May 2023 08:38:39 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Wed, 3 May 2023 12:38 UTC

XGID=-a-a--E-CB--dC---cAdb--A--:0:0:1:53:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O X | | O O X |
| X O | | O O |
| X O | | O |
| | | O |
| | | |
| |BAR| |
| | | X |
| O | | X |
| O X | | 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: 152 O: 156 X-O: 0-0
Cube: 1
X to play 53

O has 9 checkers in the zone and has the better board (even after we
PoH, if we choose to do so), so she does have an attacking threat,
which incentivizes anchoring. The 3pt evidently isn't valuable enough
to justify the PoH play. See the variant, where the choice is between
anchoring and pointing on the 4pt.

1. Rollout¹ 23/18 13/10 eq:+0.137
Player: 54.02% (G:10.38% B:0.30%)
Opponent: 45.98% (G:9.81% B:0.35%)
Confidence: ±0.012 (+0.125..+0.149) - [94.0%]

2. Rollout¹ 23/18 6/3* eq:+0.122 (-0.015)
Player: 52.94% (G:12.13% B:0.40%)
Opponent: 47.06% (G:10.87% B:0.37%)
Confidence: ±0.014 (+0.109..+0.136) - [6.0%]

3. Rollout¹ 8/3* 6/3 eq:+0.040 (-0.097)
Player: 51.11% (G:14.81% B:0.67%)
Opponent: 48.89% (G:14.47% B:0.61%)
Confidence: ±0.015 (+0.025..+0.055) - [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--a-E-CB--dC---cAdb-A---:0:0:1:42:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O X | | O O X |
| X O | | O O |
| X O | | O |
| | | O |
| | | |
| |BAR| |
| | | X |
| O | | X |
| O X | | 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: 151 O: 155 X-O: 0-0
Cube: 1
X to play 42

1. XG Roller++ 8/4* 6/4 eq:+0.171
Player: 54.19% (G:15.33% B:0.76%)
Opponent: 45.81% (G:12.84% B:0.47%)

2. XG Roller++ 22/18 13/11 eq:+0.132 (-0.039)
Player: 53.88% (G:9.60% B:0.26%)
Opponent: 46.12% (G:8.86% B:0.31%)

3. XG Roller++ 22/18 6/4* eq:+0.102 (-0.069)
Player: 52.90% (G:11.58% B:0.37%)
Opponent: 47.10% (G:10.94% B:0.35%)

eXtreme Gammon Version: 2.19.211.pre-release

---
Tim Chow

Re: Anchor or PoH?

<46e0101b-5ccf-4825-ab80-8198f0d06fa2n@googlegroups.com>

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Subject: Re: Anchor or PoH?
From: mur...@compuplus.net (MK)
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 by: MK - Fri, 5 May 2023 10:10 UTC

On May 1, 2023 at 7:39:57 AM UTC-6, Timothy Chow wrote:

> XGID=-a-a--E-CB--dC---cAdb--A--:0:0:1:53:0:0:0:0:10
> X to play 53

23/10, 13/18

MK

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