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interests / rec.games.backgammon / Rollout: Another excellent roll; how do you play it?

SubjectAuthor
* Another excellent roll; how do you play it?Timothy Chow
`- Rollout: Another excellent roll; how do you play it?Timothy Chow

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Another excellent roll; how do you play it?

<thh9mg$2ldlj$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Another excellent roll; how do you play it?
Date: Tue, 4 Oct 2022 08:41:53 -0400
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 by: Timothy Chow - Tue, 4 Oct 2022 12:41 UTC

XGID=a-aADBBBB--a----cbbbbB--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-+
| O O O | | O O X O |
| O O O | | O O X |
| O | | |
| | | |
| | | |
| |BAR| |
| | O | |
| | | X |
| | | X |
| X X | | X X X |
| O X X | | X X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 113 O: 142 X-O: 0-0
Cube: 1
X to play 66

---
Tim Chow

Rollout: Another excellent roll; how do you play it?

<thmhbs$3bpvi$2@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Another excellent roll; how do you play it?
Date: Thu, 6 Oct 2022 08:23:23 -0400
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 by: Timothy Chow - Thu, 6 Oct 2022 12:23 UTC

XGID=a-aADBBBB--a----cbbbbB--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-+
| O O O | | O O X O |
| O O O | | O O X |
| O | | |
| | | |
| | | |
| |BAR| |
| | O | |
| | | X |
| | | X |
| X X | | X X X |
| O X X | | X X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 113 O: 142 X-O: 0-0
Cube: 1
X to play 66

After 21/15(2), I was seduced by 15/3, covering the blot and making
a six-prime. What's not to like? But XG prefers to go for the gammon
with 8/2*(2), preventing O from anchoring, even at the cost of leaving
a blot that might get sent behind O's five-prime.

The blot in O's board is a factor, but not a decisive one (see variant).

1. Rollout¹ 21/15(2) 8/2*(2) eq:+1.288
Player: 79.60% (G:61.17% B:2.46%)
Opponent: 20.40% (G:2.95% B:0.12%)
Confidence: ±0.017 (+1.271..+1.305) - [100.0%]
Duration: 2 minutes 14 seconds

2. Rollout¹ 21/15 21/3 eq:+1.172 (-0.115)
Player: 80.92% (G:47.95% B:2.05%)
Opponent: 19.08% (G:2.24% B:0.09%)
Confidence: ±0.011 (+1.161..+1.184) - [0.0%]
Duration: 2 minutes 10 seconds

¹ 1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.19.211.pre-release

-------
Variant
-------

XGID=a-aADBBBB--a----cbbcbB----: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-+
| O O O | | O O X |
| O O O | | O O X |
| O | | O |
| | | |
| | | |
| |BAR| |
| | O | |
| | | X |
| | | X |
| X X | | X X X |
| O X X | | X X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 113 O: 147 X-O: 0-0
Cube: 1
X to play 66

1. Rollout¹ 21/15(2) 8/2*(2) eq:+1.107
Player: 75.80% (G:58.57% B:2.11%)
Opponent: 24.20% (G:3.65% B:0.17%)
Confidence: ±0.011 (+1.096..+1.118) - [100.0%]

2. Rollout¹ 21/15 21/3 eq:+1.062 (-0.045)
Player: 78.48% (G:44.24% B:1.58%)
Opponent: 21.52% (G:2.26% B:0.10%)
Confidence: ±0.009 (+1.053..+1.071) - [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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