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interests / rec.games.backgammon / I want another checker!

SubjectAuthor
* I want another checker!Timothy Chow
+- Re: I want another checker!peps...@gmail.com
`- Rollout: I want another checker!Timothy Chow

1
I want another checker!

<tamhnq$2cjr2$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: I want another checker!
Date: Wed, 13 Jul 2022 09:35:53 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Wed, 13 Jul 2022 13:35 UTC

XGID=-CaCBBB----------------ba-:1:1:1:43:0:0:0:0:10

X:Player 1 O:Player 2
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| | | O O |
| | | O |
| | | |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| | | X X | +---+
| | | X X X X X | | 2 |
| | | X X X X O X | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 42 O: 28 X-O: 0-0
Cube: 2, X own cube
X to play 43

---
Tim Chow

Re: I want another checker!

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Subject: Re: I want another checker!
From: pepste...@gmail.com (peps...@gmail.com)
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 by: peps...@gmail.com - Thu, 14 Jul 2022 17:05 UTC

On Wednesday, July 13, 2022 at 2:35:56 PM UTC+1, Tim Chow wrote:
> XGID=-CaCBBB----------------ba-:1:1:1:43:0:0:0:0:10
>
> X:Player 1 O:Player 2
> Score is X:0 O:0. Unlimited Game
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | | | O O |
> | | | O |
> | | | |
> | | | |
> | | | |
> | |BAR| |
> | | | |
> | | | |
> | | | X X | +---+
> | | | X X X X X | | 2 |
> | | | X X X X O X | +---+
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 42 O: 28 X-O: 0-0
> Cube: 2, X own cube
> X to play 43
>
> ---
> Tim Chow
When you count the pips with expected wastage, I think we're underdogs but it's hard (for me) to compute this exactly.
So we will need to be somewhat aggressive. I like 6/2* 5/2. This works well if we're hit and we return the hit, and it works well
if the opponent dances.
So it fails 5/9 * 25/36 of the time which ain't that often.
Tim's title makes me wary of it. Would he really create a title which hints at the solution like that? Some kind of double bluff peut-etre?
Stimmt das so?
I'll project a fake air of confidence while backing 6/2* 5/2
If I'm wrong, I hope to see a variantization where my idea works.
Hmmm, maybe the tricksterishness comes from my play being correct but not because of the return hit but because of the dancing parlay.
The dancing variation might be some sort of cube.
I like my play even better now.
Paul

Rollout: I want another checker!

<tat7c0$39him$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: I want another checker!
Date: Fri, 15 Jul 2022 22:21:48 -0400
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 by: Timothy Chow - Sat, 16 Jul 2022 02:21 UTC

XGID=-CaCBBB----------------ba-:1:1:1:43:0:0:0:0:10

X:Player 1 O:Player 2
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| | | O O |
| | | O |
| | | |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| | | X X | +---+
| | | X X X X X | | 2 |
| | | X X X X O X | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 42 O: 28 X-O: 0-0
Cube: 2, X own cube
X to play 43

According to the rollout below, Paul correctly grasped the basic
principles of this position, but chose the second-best play.
After 6/2*, XG bears off a checker with 3/off instead of covering
with 5/2. I blundered badly by ripping two checkers: 4/off 3/off.
Aggressively bearing off without worrying about getting hit is a
reasonable idea, but hitting is much better. Either O dances and
we are happy to have caught up a bit in the race, or O enters and
hits and we get a direct shot at a second checker.

1. Rollout¹ 6/2* 3/Off eq:-0.408
Player: 25.06% (G:0.00% B:0.00%)
Opponent: 74.94% (G:0.00% B:0.00%)
Confidence: ±0.005 (-0.413..-0.403) - [100.0%]

2. Rollout¹ 6/2* 5/2 eq:-0.480 (-0.072)
Player: 22.19% (G:0.00% B:0.00%)
Opponent: 77.81% (G:0.00% B:0.00%)
Confidence: ±0.004 (-0.484..-0.476) - [0.0%]

3. Rollout¹ 6/3 6/2* eq:-0.562 (-0.154)
Player: 18.87% (G:0.00% B:0.00%)
Opponent: 81.13% (G:0.00% B:0.00%)
Confidence: ±0.004 (-0.566..-0.558) - [0.0%]

4. Rollout¹ 5/1 5/2* eq:-0.603 (-0.195)
Player: 17.23% (G:0.00% B:0.00%)
Opponent: 82.77% (G:0.00% B:0.00%)
Confidence: ±0.004 (-0.607..-0.599) - [0.0%]

5. Rollout¹ 5/2* 4/Off eq:-0.630 (-0.222)
Player: 15.81% (G:0.00% B:0.00%)
Opponent: 84.19% (G:0.00% B:0.00%)
Confidence: ±0.005 (-0.634..-0.625) - [0.0%]

6. Rollout¹ 4/Off 3/Off eq:-0.677 (-0.269)
Player: 14.13% (G:0.00% B:0.00%)
Opponent: 85.87% (G:0.00% B:0.00%)
Confidence: ±0.004 (-0.681..-0.673) - [0.0%]

7. Rollout¹ 6/2* 4/1 eq:-0.697 (-0.289)
Player: 12.95% (G:0.00% B:0.00%)
Opponent: 87.05% (G:0.00% B:0.00%)
Confidence: ±0.004 (-0.700..-0.693) - [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: 2.19.207.pre-release

---
Tim Chow

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