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interests / rec.games.backgammon / Doublets are tricky to play

SubjectAuthor
* Doublets are tricky to playTimothy Chow
+- Re: Doublets are tricky to playah....Clem
+- Re: Doublets are tricky to playbadgolferman
`- Rollout: Doublets are tricky to playTimothy Chow

1
Doublets are tricky to play

<tj12ks$uevj$4@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Doublets are tricky to play
Date: Sat, 22 Oct 2022 11:35:55 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Sat, 22 Oct 2022 15:35 UTC

XGID=--b-BBE-----c----cBcBb-bAA:1:-1:1:55:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O X | | O X O O X | +---+
| O X | | O X O O | | 2 |
| O | | O | +---+
| | | |
| | X | |
| |BAR| |
| | | X |
| | | X |
| O | | X |
| O | | X X X O |
| O | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 173 O: 139 X-O: 0-0
Cube: 2, O own cube
X to play 55

---
Tim Chow

Re: Doublets are tricky to play

<tj1f82$vo08$1@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Doublets are tricky to play
Date: Sat, 22 Oct 2022 15:11:01 -0400
Organization: The Future Fair
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 by: ah....Clem - Sat, 22 Oct 2022 19:11 UTC

On 10/22/2022 11:35 AM, Timothy Chow wrote:
> XGID=--b-BBE-----c----cBcBb-bAA:1:-1:1:55:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  |             O  X |   | O  X  O     O  X | +---+
>  |             O  X |   | O  X  O     O    | | 2 |
>  |             O    |   | O                | +---+
>  |                  |   |                  |
>  |                  | X |                  |
>  |                  |BAR|                  |
>  |                  |   | X                |
>  |                  |   | X                |
>  | O                |   | X                |
>  | O                |   | X  X  X     O    |
>  | O                |   | X  X  X     O    |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 173  O: 139 X-O: 0-0
> Cube: 2, O own cube
> X to play 55

I often get these quite wrong, but here goes anyway:

Burying checkers on the ace seems anti-positional. The rearmost checker
is stuck. One five is forced to enter, which leaves three more fives to
play.

20/15(3) looks playable - if the game plan is to transition to a bar
point holding game that play does it. It also does a nice job of
outfield control and gives the straggler more chances to rest there than
keeping the 20 point.

Re-making the midpoint has it's merits, but how to play the final five?
6/1 buries a checker which i'm reluctant to do.

I'll go with bar/15 20/15(2), but without much conviction.

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

Re: Doublets are tricky to play

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From: REMOVETH...@gmail.com (badgolferman)
Newsgroups: rec.games.backgammon
Subject: Re: Doublets are tricky to play
Date: Sat, 22 Oct 2022 19:15:51 -0000 (UTC)
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 by: badgolferman - Sat, 22 Oct 2022 19:15 UTC

Timothy Chow wrote:

>XGID=--b-BBE-----c----cBcBb-bAA:1:-1:1:55:0:0:0:0:10
>
>Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | O X | | O X O O X | +---+
> | O X | | O X O O | | 2 |
> | O | | O | +---+
> | | | |
> | | X | |
> | |BAR| |
> | | | X |
> | | | X |
> | O | | X |
> | O | | X X X O |
> | O | | X X X O |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
>Pip count X: 173 O: 139 X-O: 0-0
>Cube: 2, O own cube
>X to play 55
>
>---
>Tim Chow

I think I'd just play Bar/5 and maintain the status quo for another
turn. If O happens to run one of their back checkers now I will have
two chances to hit it.

Rollout: Doublets are tricky to play

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Doublets are tricky to play
Date: Mon, 24 Oct 2022 08:19:10 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Mon, 24 Oct 2022 12:19 UTC

XGID=--b-BBE-----c----cBcBb-bAA:1:-1:1:55:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O X | | O X O O X | +---+
| O X | | O X O O | | 2 |
| O | | O | +---+
| | | |
| | X | |
| |BAR| |
| | | X |
| | | X |
| O | | X |
| O | | X X X O |
| O | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 173 O: 139 X-O: 0-0
Cube: 2, O own cube
X to play 55

A general rule of thumb is that the bar-point and 5pt anchors don't
work very well together. This roll allows X to re-establish his
midpoint and re-connect his somewhat disconnected position.

1. Rollout¹ Bar/15 18/13(2) eq:-0.134
Player: 50.94% (G:17.63% B:0.57%)
Opponent: 49.06% (G:13.44% B:0.60%)
Confidence: ±0.010 (-0.144..-0.124) - [100.0%]

2. Rollout¹ Bar/15 20/15(2) eq:-0.206 (-0.072)
Player: 49.07% (G:15.70% B:0.49%)
Opponent: 50.93% (G:15.82% B:0.61%)
Confidence: ±0.011 (-0.217..-0.195) - [0.0%]

3. Rollout¹ Bar/5 eq:-0.210 (-0.076)
Player: 48.17% (G:15.92% B:0.46%)
Opponent: 51.83% (G:12.81% B:0.52%)
Confidence: ±0.010 (-0.220..-0.200) - [0.0%]

4. Rollout¹ Bar/20 18/13(2) 6/1 eq:-0.237 (-0.103)
Player: 47.55% (G:16.08% B:0.39%)
Opponent: 52.45% (G:13.33% B:0.57%)
Confidence: ±0.011 (-0.248..-0.226) - [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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