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interests / rec.games.backgammon / Rollout: Fourth-roll position

SubjectAuthor
* Fourth-roll positionTimothy Chow
+- Re: Fourth-roll positionBlueDice
+- Re: Fourth-roll positionah....Clem
`- Rollout: Fourth-roll positionTimothy Chow

1
Fourth-roll position

<tnfbcm$33r6g$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Fourth-roll position
Date: Thu, 15 Dec 2022 09:36:05 -0500
Organization: A noiseless patient Spider
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 by: Timothy Chow - Thu, 15 Dec 2022 14:36 UTC

XGID=aA--a-D-C---dE---d-e----B-:0:0:1:64:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O | | O X |
| X O | | O X |
| X O | | O |
| X O | | O |
| X | | O |
| |BAR| |
| | O | |
| O | | X |
| O X | | X |
| O X | | X |
| O X | | X O X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 162 O: 160 X-O: 0-0
Cube: 1
X to play 64

---
Tim Chow

Re: Fourth-roll position

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Subject: Re: Fourth-roll position
From: bluedice...@gmail.com (BlueDice)
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 by: BlueDice - Thu, 15 Dec 2022 20:59 UTC

On Thursday, December 15, 2022 at 2:36:08 PM UTC, Tim Chow wrote:
> XGID=aA--a-D-C---dE---d-e----B-:0:0:1:64:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | X O | | O X |
> | X O | | O X |
> | X O | | O |
> | X O | | O |
> | X | | O |
> | |BAR| |
> | | O | |
> | O | | X |
> | O X | | X |
> | O X | | X |
> | O X | | X O X |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 162 O: 160 X-O: 0-0
> Cube: 1
> X to play 64
>
> ---
> Tim Chow

For lack of anything more appealing, I'll try a blitz with 8/4* then more wood with 13/7.
Even if the blitz stalls we may prevent O from making a good anchor.
--
BD

Re: Fourth-roll position

<tnggtn$36p6k$2@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Fourth-roll position
Date: Thu, 15 Dec 2022 20:16:39 -0500
Organization: The Future Fair
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 by: ah....Clem - Fri, 16 Dec 2022 01:16 UTC

On 12/15/2022 9:36 AM, Timothy Chow wrote:
> XGID=aA--a-D-C---dE---d-e----B-:0:0:1:64:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  | X           O    |   | O              X |
>  | X           O    |   | O              X |
>  | X           O    |   | O                |
>  | X           O    |   | O                |
>  | X                |   | O                |
>  |                  |BAR|                  |
>  |                  | O |                  |
>  | O                |   | X                |
>  | O           X    |   | X                |
>  | O           X    |   | X                |
>  | O           X    |   | X     O        X |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 162  O: 160 X-O: 0-0
> Cube: 1
> X to play 64

O is on the bar, so why not make a second home board point and increase
the dancing rolls by a factor of four?

Make the deuce point.

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

Rollout: Fourth-roll position

<tnkg5r$3lm0k$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Fourth-roll position
Date: Sat, 17 Dec 2022 08:28:26 -0500
Organization: A noiseless patient Spider
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 by: Timothy Chow - Sat, 17 Dec 2022 13:28 UTC

XGID=aA--a-D-C---dE---d-e----B-:0:0:1:64:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O | | O X |
| X O | | O X |
| X O | | O |
| X O | | O |
| X | | O |
| |BAR| |
| | O | |
| O | | X |
| O X | | X |
| O X | | X |
| O X | | X O X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 162 O: 160 X-O: 0-0
Cube: 1
X to play 64

For Stick's benefit, let's mention the Nactation: 51S-41K-64<-64.

No play is particularly attractive here. Like ah...clem, I tried
8/2 6/2. The trouble is that unless O dances, 8/2 6/2 doesn't
accomplish too much; it's an attacking play, but O should be able
to enter easily, possibly anchoring or hitting in the process, and
X has only 8 checkers in the zone. If X is going to attack, then
hitting 8/4* and bringing another checker into the zone is the way
to go. I didn't like this play because it creates two blots in
my board, but at least it stops O from anchoring immediately, and
if things go well, it could turn into a blitz.

1. Rollout¹ 13/7 8/4* eq:-0.092
Player: 47.64% (G:15.46% B:0.46%)
Opponent: 52.36% (G:15.99% B:1.07%)
Confidence: ±0.014 (-0.106..-0.078) - [100.0%]

2. Rollout¹ 24/20 13/7 eq:-0.143 (-0.051)
Player: 46.73% (G:12.17% B:0.32%)
Opponent: 53.27% (G:14.46% B:0.77%)
Confidence: ±0.015 (-0.158..-0.128) - [0.0%]

3. Rollout¹ 24/18 8/4* eq:-0.152 (-0.060)
Player: 46.66% (G:12.52% B:0.37%)
Opponent: 53.34% (G:16.19% B:0.79%)
Confidence: ±0.015 (-0.167..-0.136) - [0.0%]

4. Rollout¹ 8/2 6/2 eq:-0.176 (-0.084)
Player: 45.60% (G:14.19% B:0.40%)
Opponent: 54.40% (G:15.99% B:0.80%)
Confidence: ±0.016 (-0.192..-0.160) - [0.0%]

5. Rollout¹ 24/14 eq:-0.213 (-0.121)
Player: 45.58% (G:10.39% B:0.36%)
Opponent: 54.42% (G:15.45% B:0.65%)
Confidence: ±0.014 (-0.227..-0.198) - [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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