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interests / rec.games.backgammon / Six-prime versus six-prime

SubjectAuthor
* Six-prime versus six-primeTimothy Chow
+- Re: Six-prime versus six-primeah....Clem
`- Rollout: Six-prime versus six-primeTimothy Chow

1
Six-prime versus six-prime

<tb6buo$13udq$2@dont-email.me>

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Path: i2pn2.org!i2pn.org!eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Six-prime versus six-prime
Date: Tue, 19 Jul 2022 09:35:19 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Tue, 19 Jul 2022 13:35 UTC

XGID=-a-BBBBCC---------cbbcbbA-:0:0:1:00:0:0:0:0:10

X:Player 2 O:Player 1
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O | | O O O O O X |
| O | | O O O O O |
| O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| X X | | |
| X X | | X X X X |
| X X | | X X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 105 O: 89 X-O: 0-0
Cube: 1
X on roll, cube action

---
Tim Chow

Re: Six-prime versus six-prime

<tb924k$1llkp$1@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Six-prime versus six-prime
Date: Wed, 20 Jul 2022 10:06:11 -0400
Organization: The Future Fair
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In-Reply-To: <tb6buo$13udq$2@dont-email.me>
 by: ah....Clem - Wed, 20 Jul 2022 14:06 UTC

On 7/19/2022 9:35 AM, Timothy Chow wrote:
> XGID=-a-BBBBCC---------cbbcbbA-:0:0:1:00:0:0:0:0:10
>
> X:Player 2   O:Player 1
> Score is X:0 O:0. Unlimited Game
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  |                O |   | O  O  O  O  O  X |
>  |                O |   | O  O  O  O  O    |
>  |                O |   |       O          |
>  |                  |   |                  |
>  |                  |   |                  |
>  |                  |BAR|                  |
>  |                  |   |                  |
>  |                  |   |                  |
>  |             X  X |   |                  |
>  |             X  X |   | X  X  X  X       |
>  |             X  X |   | X  X  X  X     O |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 105  O: 89 X-O: 0-0
> Cube: 1
> X on roll, cube action

Stick says all "normal looking" prime vs primes are takes. Where,
presumably, he has a much better eye than the rest of us for what looks
"normal".

But this looks pretty normal to me so I'll say take. Then, O has less
timing before she's forced to hit or break the prime, either of which
gives great advantage to X. Lots of market losers and few bad sequences
(e.g. big doubles for X) So I'll say it's a cube. Can't be TG.

D/T.

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

Rollout: Six-prime versus six-prime

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Six-prime versus six-prime
Date: Thu, 21 Jul 2022 08:56:02 -0400
Organization: A noiseless patient Spider
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In-Reply-To: <tb6buo$13udq$2@dont-email.me>
 by: Timothy Chow - Thu, 21 Jul 2022 12:56 UTC

XGID=-a-BBBBCC---------cbbcbbA-:0:0:1:00:0:0:0:0:10

X:Player 2 O:Player 1
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O | | O O O O O X |
| O | | O O O O O |
| O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| X X | | |
| X X | | X X X X |
| X X | | X X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 105 O: 89 X-O: 0-0
Cube: 1
X on roll, cube action

The rollouts below say this is a pass, but if you make a one-pip
change, it becomes a big take.

Analyzed in Rollout
No double
Player Winning Chances: 76.00% (G:9.78% B:0.34%)
Opponent Winning Chances: 24.00% (G:3.82% B:0.12%)
Double/Take
Player Winning Chances: 76.00% (G:10.61% B:0.42%)
Opponent Winning Chances: 24.00% (G:3.97% B:0.12%)

Cubeful Equities:
No double: +0.787 (-0.213)
Double/Take: +1.032 (+0.032)
Double/Pass: +1.000

Best Cube action: Double / Pass

Rollout:
1296 Games rolled with Variance Reduction.
Dice Seed: 271828
Moves: 3-ply, cube decisions: XG Roller
Confidence No Double: ± 0.008 (+0.779..+0.796)
Confidence Double: ± 0.013 (+1.019..+1.045)

eXtreme Gammon Version: 2.19.207.pre-release

-------
Variant
-------

XGID=-a-BBBCBC---------cbbcbbA-:0:0:1:00:0:0:0:0:10

X:Player 2 O:Player 1
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O | | O O O O O X |
| O | | O O O O O |
| O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| X | | X |
| X X | | X X X X |
| X X | | X X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 104 O: 89 X-O: 0-0
Cube: 1
X on roll, cube action

Analyzed in Rollout
No double
Player Winning Chances: 71.88% (G:9.02% B:0.31%)
Opponent Winning Chances: 28.12% (G:4.40% B:0.16%)
Double/Take
Player Winning Chances: 71.75% (G:9.86% B:0.34%)
Opponent Winning Chances: 28.25% (G:4.59% B:0.16%)

Cubeful Equities:
No double: +0.662 (-0.148)
Double/Take: +0.810
Double/Pass: +1.000 (+0.190)

Best Cube action: Double / Take

Rollout:
1296 Games rolled with Variance Reduction.
Dice Seed: 271828
Moves: 3-ply, cube decisions: XG Roller
Confidence No Double: ± 0.010 (+0.653..+0.672)
Confidence Double: ± 0.015 (+0.795..+0.825)

eXtreme Gammon Version: 2.19.207.pre-release

---
Tim Chow

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