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interests / rec.games.backgammon / Re: Which 6?

SubjectAuthor
* Which 6?Timothy Chow
+- Re: Which 6?Robert Zimmerman
+- Rollout: Which 6?Timothy Chow
`- Re: Which 6?MK

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Which 6?

<u1rdft$jpr9$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Which 6?
Date: Thu, 20 Apr 2023 09:08:12 -0400
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 by: Timothy Chow - Thu, 20 Apr 2023 13:08 UTC

XGID=--aaaBEAB---ca---bccAA-B-A: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-+
| O O O | | O X X X |
| O O | | O X |
| O | | O |
| | | |
| | X | |
| |BAR| |
| | | X |
| | | X |
| O | | X |
| O X | | X X |
| O X X | | X X O O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 175 O: 172 X-O: 0-0
Cube: 1
X to play 64

---
Tim Chow

Re: Which 6?

<b84681c6-a3cc-484f-9f8a-7fd993d5914bn@googlegroups.com>

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Subject: Re: Which 6?
From: zimbrook...@gmail.com (Robert Zimmerman)
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 by: Robert Zimmerman - Thu, 20 Apr 2023 15:26 UTC

On Thursday, April 20, 2023 at 9:08:16 AM UTC-4, Timothy Chow wrote:
> XGID=--aaaBEAB---ca---bccAA-B-A: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-+
> | O O O | | O X X X |
> | O O | | O X |
> | O | | O |
> | | | |
> | | X | |
> | |BAR| |
> | | | X |
> | | | X |
> | O | | X |
> | O X | | X X |
> | O X X | | X X O O O |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 175 O: 172 X-O: 0-0
> Cube: 1
> X to play 64
>
> ---
> Tim Chow
Seems like not moving would be most desirable. But that's not an option. We're not in back game territory with an even pip count. Moving forward looks viable, but messy without the midpoint to work with. To move forward it would be really desirable to make the golden point, so moving that blot to the outfield is not great. But moving from the anchors is worse. Playing a 6 in the infield? 8/2 is asking for a back game. 7/1 kills a checker but would be most consistent with a blitzing game, which is what the infield is set up for right now. For me it's between 20/14 and 7/1 which is not exactly sticking you neck out, Bob, since there are only 4 items on the menu. OK, 20/14.
Bob

Rollout: Which 6?

<u21573$3bv2k$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Which 6?
Date: Sat, 22 Apr 2023 13:23:46 -0400
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 by: Timothy Chow - Sat, 22 Apr 2023 17:23 UTC

XGID=--aaaBEAB---ca---bccAA-B-A: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-+
| O O O | | O X X X |
| O O | | O X |
| O | | O |
| | | |
| | X | |
| |BAR| |
| | | X |
| | | X |
| O | | X |
| O X | | X X |
| O X X | | X X O O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 175 O: 172 X-O: 0-0
Cube: 1
X to play 64

If you're playing this with a physical board, or with the pip count
turned off, it's easy to fall into the trap of thinking that X is
behind in the pip count because he has so many checkers back. Putting
a checker out of play with 7/1 goes against the grain, but it's XG's
preferred play by far. It does have the obvious advantage of dodging
O's triple direct shot.

For the variant, I made a rather large change in the position, by
swinging one of X's 6pt spares all the way around the board.

1. Rollout¹ Bar/21 7/1 eq:-0.527
Player: 36.25% (G:11.34% B:0.44%)
Opponent: 63.75% (G:17.98% B:0.80%)
Confidence: ±0.017 (-0.544..-0.510) - [100.0%]

2. Rollout¹ Bar/15 eq:-0.633 (-0.106)
Player: 34.66% (G:10.05% B:0.55%)
Opponent: 65.34% (G:22.85% B:1.61%)
Confidence: ±0.028 (-0.662..-0.605) - [0.0%]

3. Rollout¹ Bar/21 20/14 eq:-0.649 (-0.122)
Player: 34.59% (G:9.90% B:0.52%)
Opponent: 65.41% (G:20.48% B:1.03%)
Confidence: ±0.022 (-0.672..-0.627) - [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=--aaaBDAB---ca---bccBA-B-A: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-+
| O O O | | O X X X |
| O O | | O X X |
| O | | O |
| | | |
| | X | |
| |BAR| |
| | | |
| | | X |
| O | | X |
| O X | | X X |
| O X X | | X X O O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 189 O: 172 X-O: 0-0
Cube: 1
X to play 64

1. Rollout¹ Bar/15 eq:-0.485
Player: 39.15% (G:9.81% B:0.47%)
Opponent: 60.85% (G:18.93% B:0.91%)
Confidence: ±0.015 (-0.499..-0.470) - [100.0%]

2. Rollout¹ Bar/21 7/1 eq:-0.526 (-0.042)
Player: 36.52% (G:9.92% B:0.30%)
Opponent: 63.48% (G:16.31% B:0.70%)
Confidence: ±0.013 (-0.539..-0.513) - [0.0%]

¹ 2592 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

Re: Which 6?

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Subject: Re: Which 6?
From: mur...@compuplus.net (MK)
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 by: MK - Fri, 5 May 2023 10:31 UTC

On April 20, 2023 at 7:08:16 AM UTC-6, Timothy Chow wrote:

> XGID=--aaaBEAB---ca---bccAA-B-A:0:0:1:64:0:0:0:0:10
> X to play 64

Bar/1, 7/21 :)

MK

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