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It is much easier to suggest solutions when you know nothing about the problem.

interests / rec.games.backgammon / Re: Rollout: O has 8 checkers borne off

O has 8 checkers borne off

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: O has 8 checkers borne off
Date: Wed, 3 May 2023 08:40:41 -0400
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by: Timothy Chow - Wed, 3 May 2023 12:40 UTC

I'm not sure why XG doesn't draw the borne-off checkers. Sometimes
I add them by hand, but I'm feeling lazy today. Oh, and X has
2 checkers borne off already.

XGID=aB-BCCC----------------db-:1:1:1:44:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| | | O O |
| | | O O |
| | | O |
| | | O |
| | | |
| |BAR| |
| | O | |
| | | |
| | | X X X | +---+
| | | X X X X X | | 2 |
| | | X X X X X | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 53 O: 35 X-O: 0-0
Cube: 2, X own cube
X to play 44

---
Tim Chow

Rollout: O has 8 checkers borne off

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: O has 8 checkers borne off
Date: Fri, 5 May 2023 12:29:16 -0400
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by: Timothy Chow - Fri, 5 May 2023 16:29 UTC

XGID=aB-BCCC----------------db-:1:1:1:44:0:0:0:0:10

I was rather surprised that XG thought that keeping a five-point board
was so much better than ripping off an extra two checkers. I'm not sure
I have any good techniques for making this type of decision in general.

1. Rollout¹ 6/2(3) 4/Off eq:+0.263
Player: 52.72% (G:0.00% B:0.00%)
Opponent: 47.28% (G:0.00% B:0.00%)
Confidence: ±0.005 (+0.258..+0.268) - [100.0%]

2. Rollout¹ 5/1 4/Off(3) eq:+0.177 (-0.085)
Player: 50.39% (G:0.00% B:0.00%)
Opponent: 49.61% (G:0.00% B:0.00%)
Confidence: ±0.006 (+0.171..+0.183) - [0.0%]

¹ 1296 Games rolled with Variance Reduction.
Dice Seed: 271828
Moves: 4-ply, cube decisions: XG Roller+
Search interval: Large

eXtreme Gammon Version: 2.19.211.pre-release

---
Tim Chow

Re: Rollout: O has 8 checkers borne off

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Subject: Re: Rollout: O has 8 checkers borne off
From: bananabo...@gmail.com (Stick Rice)
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by: Stick Rice - Sat, 6 May 2023 03:44 UTC

On Friday, May 5, 2023 at 12:29:19 PM UTC-4, Timothy Chow wrote:
> XGID=aB-BCCC----------------db-:1:1:1:44:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | | | O O |
> | | | O O |
> | | | O |
> | | | O |
> | | | |
> | |BAR| |
> | | O | |
> | | | |
> | | | X X X | +---+
> | | | X X X X X | | 2 |
> | | | X X X X X | +---+
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 53 O: 35 X-O: 0-0
> Cube: 2, X own cube
> X to play 44
> I was rather surprised that XG thought that keeping a five-point board
> was so much better than ripping off an extra two checkers. I'm not sure
> I have any good techniques for making this type of decision in general.
>
> 1. Rollout¹ 6/2(3) 4/Off eq:+0.263
> Player: 52.72% (G:0.00% B:0.00%)
> Opponent: 47.28% (G:0.00% B:0.00%)
> Confidence: ±0.005 (+0.258..+0.268) - [100.0%]
>
> 2. Rollout¹ 5/1 4/Off(3) eq:+0.177 (-0.085)
> Player: 50.39% (G:0.00% B:0.00%)
> Opponent: 49.61% (G:0.00% B:0.00%)
> Confidence: ±0.006 (+0.171..+0.183) - [0.0%]
>
> ¹ 1296 Games rolled with Variance Reduction.
> Dice Seed: 271828
> Moves: 4-ply, cube decisions: XG Roller+
> Search interval: Large
>
> eXtreme Gammon Version: 2.19.211.pre-release
>
> ---
> Tim Chow

It's two extra checkers off immediately but overall not only does it leave a lot more shots immediately, it's such a slow bearoff that those 'extra two checkers off' come back to not being cumulatively more.

Stick

Subject	Author
O has 8 checkers borne off	Timothy Chow
Rollout: O has 8 checkers borne off	Timothy Chow
Re: Rollout: O has 8 checkers borne off	Stick Rice