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interests / rec.games.backgammon / Boxcars

SubjectAuthor
* BoxcarsTimothy Chow
`- Rollout: BoxcarsTimothy Chow

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Boxcars

<ujgm49$g8uq$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Boxcars
Date: Mon, 20 Nov 2023 17:20:57 -0500
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 by: Timothy Chow - Mon, 20 Nov 2023 22:20 UTC

XGID=--B--BB-Ba--dE--abbeA---A-: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 |
| X | | O |
| X | | O |
| X | | O |
| |BAR| |
| | | |
| O | | |
| O | | |
| O X | | X X X |
| O O X | | X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 151 O: 137 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: Wed, 22 Nov 2023 09:59:26 -0500
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 by: Timothy Chow - Wed, 22 Nov 2023 14:59 UTC

XGID=--B--BB-Ba--dE--abbeA---A-: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 |
| X | | O |
| X | | O |
| X | | O |
| |BAR| |
| | | |
| O | | |
| O | | |
| O X | | X X X |
| O O X | | X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 151 O: 137 X-O: 0-0
Cube: 1
X to play 66

This roll puts X ahead in the race, so a natural plan is to race with
20/8 13/7(2). However, the alternative of 13/1(2) gives X a four-point
board (versus O's one-point board) and good chances of hitting a shot.
13/1(2) certainly wins more gammons.

In the variant, X is further ahead in the race, and 20/8 still allows
X to make a four-point board.

1. Rollout¹ 13/1(2) eq:-0.053
Player: 46.99% (G:15.40% B:0.20%)
Opponent: 53.01% (G:8.31% B:0.33%)
Confidence: ±0.010 (-0.063..-0.044) - [100.0%]

2. Rollout¹ 20/8 13/7(2) eq:-0.141 (-0.088)
Player: 46.03% (G:7.32% B:0.12%)
Opponent: 53.97% (G:5.30% B:0.13%)
Confidence: ±0.010 (-0.151..-0.131) - [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=-AB--BB-Aa--dE--abbeA---A-: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 |
| X | | O |
| X | | O |
| X | | O |
| |BAR| |
| | | |
| O | | |
| O | | |
| O | | X X X |
| O O X | | X X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 144 O: 137 X-O: 0-0
Cube: 1
X to play 66

1. Rollout¹ 20/8 13/1 eq:+0.005
Player: 49.51% (G:12.28% B:0.11%)
Opponent: 50.49% (G:5.70% B:0.17%)
Confidence: ±0.011 (-0.006..+0.016) - [59.0%]

2. Rollout¹ 13/7(2) 13/1 eq:+0.003 (-0.002)
Player: 48.92% (G:17.16% B:0.24%)
Opponent: 51.08% (G:8.45% B:0.41%)
Confidence: ±0.011 (-0.008..+0.014) - [41.0%]

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

interests / rec.games.backgammon / Boxcars

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