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interests / rec.games.backgammon / Boxcars

SubjectAuthor
* BoxcarsTimothy Chow
`- Rollout: BoxcarsTimothy Chow

1
Boxcars

<uhtkik$1kpbl$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Boxcars
Date: Wed, 1 Nov 2023 09:41:39 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Wed, 1 Nov 2023 13:41 UTC

XGID=-aa-BBC-B---cC---cbcb--AB-:0:0:1:66:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O O X X |
| X O O | | O O X |
| X O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| O | | X |
| O X | | X X X |
| O X | | X X X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 162 O: 152 X-O: 0-0
Cube: 1
X to play 66

---
Tim Chow

Rollout: Boxcars

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Boxcars
Date: Sat, 4 Nov 2023 13:06:39 -0400
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 by: Timothy Chow - Sat, 4 Nov 2023 17:06 UTC

XGID=-aa-BBC-B---cC---cbcb--AB-:0:0:1:66:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O O X X |
| X O O | | O O X |
| X O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| O | | X |
| O X | | X X X |
| O X | | X X X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 162 O: 152 X-O: 0-0
Cube: 1
X to play 66

This is one of X's best rolls, but it's still not very pleasant to play,
since after 8/2*(2), X has to choose between hitting loose on the 1pt
with 13/1*, and making 5 out of 6 points with 13/7(2) but leaving a blot
on the midpoint and potentially allowing O to anchor on X's 1pt. XG
favors hitting twice, but see also the variant below.

1. Rollout¹ 13/1* 8/2*(2) eq:+0.059
Player: 47.43% (G:27.35% B:0.44%)
Opponent: 52.57% (G:16.42% B:1.07%)
Confidence: ±0.016 (+0.043..+0.075) - [100.0%]

2. Rollout¹ 13/7(2) 8/2*(2) eq:-0.034 (-0.093)
Player: 46.13% (G:23.27% B:0.89%)
Opponent: 53.87% (G:16.70% B:1.06%)
Confidence: ±0.018 (-0.053..-0.016) - [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=-aaABBB-B---cC---cbcb--AB-:0:0:1:66:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O O X X |
| X O O | | O O X |
| X O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| O | | |
| O X | | X X X |
| O X | | X X X X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 159 O: 152 X-O: 0-0
Cube: 1
X to play 66

1. Rollout¹ 13/1* 8/2*(2) eq:-0.270
Player: 41.43% (G:22.12% B:0.38%)
Opponent: 58.57% (G:21.44% B:1.92%)
Confidence: ±0.010 (-0.279..-0.260) - [98.0%]

2. Rollout¹ 13/7(2) 8/2*(2) eq:-0.283 (-0.014)
Player: 41.13% (G:20.05% B:0.71%)
Opponent: 58.87% (G:21.06% B:1.69%)
Confidence: ±0.009 (-0.292..-0.275) - [2.0%]

¹ 5184 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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