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interests / rec.games.backgammon / Another priming battle

SubjectAuthor
* Another priming battleTimothy Chow
`- Rollout: Another priming battleTimothy Chow

1
Another priming battle

<t65iee$5cb$2@dont-email.me>

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https://www.novabbs.com/interests/article-flat.php?id=8942&group=rec.games.backgammon#8942

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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: Another priming battle
Date: Thu, 19 May 2022 09:58:37 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Thu, 19 May 2022 13:58 UTC

XGID=-a-aBBBBBB--a---bcbcb-A-B-:0:0:1:41:0:0:0:0:10

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-+
| O O O | | O O X X |
| O O O | | O O X |
| O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| | | |
| X X X | | X X X |
| O X X X | | X X X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 148 O: 143 X-O: 0-0
Cube: 1
X to play 41

---
Tim Chow

Rollout: Another priming battle

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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: Rollout: Another priming battle
Date: Sat, 21 May 2022 11:21:11 -0400
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 by: Timothy Chow - Sat, 21 May 2022 15:21 UTC

XGID=-a-aBBBBBB--a---bcbcb-A-B-:0:0:1:41:0:0:0:0:10

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-+
| O O O | | O O X X |
| O O O | | O O X |
| O | | O |
| | | |
| | | |
| |BAR| |
| | | |
| | | |
| | | |
| X X X | | X X X |
| O X X X | | X X X O O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 148 O: 143 X-O: 0-0
Cube: 1
X to play 41

Keep a solid five-prime, or hit? XG says hit. Part of the point is
that X still has a pretty good prime after 8/3*, with (for example)
O's checker on X's 1pt *not* at the edge of the prime. 8/3* does
lose more gammons, but even at gammon save, XG slightly favors 8/3*.

1. Rollout¹ 8/3* eq:-0.618
Player: 35.44% (G:10.88% B:0.62%)
Opponent: 64.56% (G:23.90% B:2.06%)
Confidence: ±0.016 (-0.633..-0.602) - [100.0%]

2. Rollout¹ 22/21 7/3* eq:-0.759 (-0.141)
Player: 33.78% (G:10.36% B:0.71%)
Opponent: 66.22% (G:26.56% B:2.95%)
Confidence: ±0.022 (-0.781..-0.737) - [0.0%]

3. Rollout¹ 9/8 9/5 eq:-0.761 (-0.144)
Player: 32.15% (G:9.09% B:0.49%)
Opponent: 67.85% (G:21.96% B:1.64%)
Confidence: ±0.022 (-0.783..-0.739) - [0.0%]

4. Rollout¹ 22/21 9/5 eq:-0.777 (-0.159)
Player: 33.07% (G:10.07% B:0.68%)
Opponent: 66.93% (G:25.76% B:2.56%)
Confidence: ±0.024 (-0.800..-0.753) - [0.0%]

5. Rollout¹ 24/23 9/5 eq:-0.788 (-0.170)
Player: 32.74% (G:9.07% B:0.46%)
Opponent: 67.26% (G:24.65% B:1.92%)
Confidence: ±0.023 (-0.811..-0.765) - [0.0%]

¹ 1296 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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