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interests / rec.games.backgammon / More blitzing fun

SubjectAuthor
* More blitzing funTimothy Chow
+- Re: More blitzing funah....Clem
`- Rollout: More blitzing funTimothy Chow

1
More blitzing fun

<tok9c4$b7rr$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: More blitzing fun
Date: Thu, 29 Dec 2022 09:48:36 -0500
Organization: A noiseless patient Spider
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 by: Timothy Chow - Thu, 29 Dec 2022 14:48 UTC

XGID=bBBABBB-----d-b-Ac-dB--A--:1:-1:1:54:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O X O | | O X X | +---+
| O O | | O X | | 2 |
| O | | O | +---+
| | | O |
| | | |
| |BAR| |
| | O | |
| O | O | |
| O | | |
| O | | X X X X X |
| O | | X X X X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 118 O: 172 X-O: 0-0
Cube: 2, O own cube
X to play 54

---
Tim Chow

Re: More blitzing fun

<tondpn$nq0e$2@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: More blitzing fun
Date: Fri, 30 Dec 2022 14:22:32 -0500
Organization: The Future Fair
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In-Reply-To: <tok9c4$b7rr$2@dont-email.me>
 by: ah....Clem - Fri, 30 Dec 2022 19:22 UTC

On 12/29/2022 9:48 AM, Timothy Chow wrote:
> XGID=bBBABBB-----d-b-Ac-dB--A--:1:-1:1:54:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  |    O     X  O    |   | O  X        X    | +---+
>  |    O        O    |   | O  X             | | 2 |
>  |             O    |   | O                | +---+
>  |                  |   | O                |
>  |                  |   |                  |
>  |                  |BAR|                  |
>  |                  | O |                  |
>  | O                | O |                  |
>  | O                |   |                  |
>  | O                |   | X  X  X     X  X |
>  | O                |   | X  X  X  X  X  X |
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 118  O: 172 X-O: 0-0
> Cube: 2, O own cube
> X to play 54

Point > hit > build > escape says play 15/7. So, I'll do that, fully
expecting QF to say it's not the bot play.

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

Rollout: More blitzing fun

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: More blitzing fun
Date: Sat, 31 Dec 2022 10:29:51 -0500
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In-Reply-To: <tok9c4$b7rr$2@dont-email.me>
 by: Timothy Chow - Sat, 31 Dec 2022 15:29 UTC

XGID=bBBABBB-----d-b-Ac-dB--A--:1:-1:1:54:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O X O | | O X X | +---+
| O O | | O X | | 2 |
| O | | O | +---+
| | | O |
| | | |
| |BAR| |
| | O | |
| O | O | |
| O | | |
| O | | X X X X X |
| O | | X X X X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 118 O: 172 X-O: 0-0
Cube: 2, O own cube
X to play 54

When there's no danger that our back checkers will get stuck, we
usually prioritize bringing builders into the zone over escaping
the back checkers. However, in this position, 16/7 creates enough
inflexibility (visualize, for example, what happens if X rolls 33
or 44 next) that XG favors 20/11, which is a balance between
escaping and building.

See also the variant for comparison.

1. Rollout¹ 20/11 eq:+1.223
Player: 82.03% (G:69.30% B:0.40%)
Opponent: 17.97% (G:3.83% B:0.20%)
Confidence: ±0.009 (+1.215..+1.232) - [100.0%]

2. Rollout¹ 20/16 20/15 eq:+1.194 (-0.030)
Player: 81.54% (G:67.42% B:0.41%)
Opponent: 18.46% (G:3.84% B:0.19%)
Confidence: ±0.008 (+1.185..+1.202) - [0.0%]

3. Rollout¹ 16/7 eq:+1.143 (-0.080)
Player: 79.95% (G:66.96% B:0.36%)
Opponent: 20.05% (G:4.10% B:0.19%)
Confidence: ±0.010 (+1.134..+1.153) - [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=bBBABBB-----d-b-Ac-dAA-A--:1:-1:1:54:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| O X O | | O X X X | +---+
| O O | | O | | 2 |
| O | | O | +---+
| | | O |
| | | |
| |BAR| |
| | O | |
| O | O | |
| O | | |
| O | | X X X X X |
| O | | X X X X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 119 O: 172 X-O: 0-0
Cube: 2, O own cube
X to play 54

1. Rollout¹ 16/7 eq:+1.242
Player: 82.23% (G:71.13% B:0.38%)
Opponent: 17.77% (G:3.83% B:0.21%)
Confidence: ±0.009 (+1.233..+1.251) - [100.0%]

2. Rollout¹ 20/11 eq:+1.221 (-0.021)
Player: 81.86% (G:69.31% B:0.36%)
Opponent: 18.14% (G:3.66% B:0.18%)
Confidence: ±0.009 (+1.212..+1.229) - [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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