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interests / rec.games.backgammon / Hit and then...?

SubjectAuthor
* Hit and then...?Timothy Chow
`- Rollout: Hit and then...?Timothy Chow

1
Hit and then...?

<t4n73t$kph$2@dont-email.me>

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https://www.novabbs.com/interests/article-flat.php?id=8760&group=rec.games.backgammon#8760

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Path: i2pn2.org!i2pn.org!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Hit and then...?
Date: Sun, 1 May 2022 20:03:09 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Mon, 2 May 2022 00:03 UTC

XGID=-b--BaE-BA--cC---a-dbBb---:0:0:1:21:0:0:0:0:10

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-+
| X O | | O O X O |
| X | | O O X O |
| X | | O |
| | | O |
| | | |
| |BAR| |
| | | X |
| | | X |
| O | | X |
| O X | | X X O |
| O X X | | X O X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 144 O: 155 X-O: 0-0
Cube: 1
X to play 21

---
Tim Chow

Rollout: Hit and then...?

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Hit and then...?
Date: Tue, 3 May 2022 09:47:28 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Tue, 3 May 2022 13:47 UTC

XGID=-b--BaE-BA--cC---a-dbBb---:0:0:1:21:0:0:0:0:10

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-+
| X O | | O O X O |
| X | | O O X O |
| X | | O |
| | | O |
| | | |
| |BAR| |
| | | X |
| | | X |
| O | | X |
| O X | | X X O |
| O X X | | X O X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 144 O: 155 X-O: 0-0
Cube: 1
X to play 21

Despite the subject line, one really should consider the non-hitting
play 9/8 6/4. However, XG does hit. After 6/5*, I played 13/11,
and was surprised that XG wanted to play 5/3 instead. Apparently,
XG judges both 6/5* 13/11 and 6/5* 6/4 to be too loose, given O's
decent board and X's poor structure.

1. Rollout¹ 6/5* 5/3 eq:+0.266
Player: 55.81% (G:18.90% B:1.51%)
Opponent: 44.19% (G:12.92% B:0.53%)
Confidence: ±0.009 (+0.257..+0.275) - [100.0%]

2. Rollout¹ 9/8 6/4 eq:+0.214 (-0.052)
Player: 55.25% (G:13.75% B:0.61%)
Opponent: 44.75% (G:10.06% B:0.35%)
Confidence: ±0.007 (+0.207..+0.220) - [0.0%]

3. Rollout¹ 13/11 6/5* eq:+0.205 (-0.061)
Player: 54.82% (G:18.89% B:1.51%)
Opponent: 45.18% (G:15.96% B:0.68%)
Confidence: ±0.009 (+0.196..+0.213) - [0.0%]

4. Rollout¹ 6/4 6/5* eq:+0.200 (-0.066)
Player: 54.23% (G:17.54% B:1.28%)
Opponent: 45.77% (G:13.39% B:0.50%)
Confidence: ±0.008 (+0.192..+0.208) - [0.0%]

¹ 5184 Games rolled with Variance Reduction.
Dice Seed: 271828
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.19.207.pre-release

---
Tim Chow

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