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interests / rec.games.backgammon / Rollout: Hit or make the 5pt? 2

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* Hit or make the 5pt? 2Timothy Chow
`- Rollout: Hit or make the 5pt? 2Timothy Chow

1
Hit or make the 5pt? 2

<sus4pt$5sr$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Hit or make the 5pt? 2
Date: Sat, 19 Feb 2022 20:16:43 -0500
Organization: A noiseless patient Spider
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 by: Timothy Chow - Sun, 20 Feb 2022 01:16 UTC

XGID=-b----DBB-a-dC---c-d-A-aAB:0:0:1:11:0:0:0:0:10

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 X O X |
| X O | | O |
| X O | | O |
| | X | O |
| | X | |
| |BAR| |
| | | |
| O | | X |
| O | | X |
| O X X | | X O |
| O O X X | | X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 188 O: 165 X-O: 0-0
Cube: 1
X to play 11

---
Tim Chow

Rollout: Hit or make the 5pt? 2

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Hit or make the 5pt? 2
Date: Mon, 21 Feb 2022 08:28:56 -0500
Organization: A noiseless patient Spider
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 by: Timothy Chow - Mon, 21 Feb 2022 13:28 UTC

XGID=-b----DBB-a-dC---c-d-A-aAB:0:0:1:11:0:0:0:0:10

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 X O X |
| X O | | O |
| X O | | O |
| | X | O |
| | X | |
| |BAR| |
| | | |
| O | | X |
| O | | X |
| O X X | | X O |
| O O X X | | X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 188 O: 165 X-O: 0-0
Cube: 1
X to play 11

Hitting is tempting here; it unstacks the ugly 24pt, gains pips in the
race, and gains a tempo for hitting O's other blot. On the other hand,
making the 5pt helps lock in O's back checkers. O's blot on her 2pt is
misplaced anyway and so it's not urgent to hit it.

In the variant, one of O's back checkers has escaped, so the priming
strategy is less effective.

1. Rollout¹ Bar/24(2) 6/5(2) eq:+0.413
Player: 60.46% (G:18.55% B:1.04%)
Opponent: 39.54% (G:13.02% B:0.98%)
Confidence: ±0.023 (+0.390..+0.436) - [100.0%]

2. Rollout¹ Bar/24 Bar/23* 21/20 eq:+0.196 (-0.217)
Player: 53.95% (G:16.27% B:1.02%)
Opponent: 46.05% (G:11.65% B:0.61%)
Confidence: ±0.022 (+0.174..+0.218) - [0.0%]

3. Rollout¹ Bar/24 Bar/23* 23/22 eq:+0.169 (-0.244)
Player: 53.49% (G:15.85% B:0.89%)
Opponent: 46.51% (G:11.55% B:0.61%)
Confidence: ±0.016 (+0.153..+0.186) - [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

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

XGID=-a----DBB-b-dC---c-d-A-aAB:0:0:1:11:0:0:0:0:10

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 X O X |
| X O | | O |
| X O | | O |
| | X | O |
| | X | |
| |BAR| |
| | | |
| O | | X |
| O | | X |
| O O X X | | X |
| O O X X | | X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 188 O: 156 X-O: 0-0
Cube: 1
X to play 11

1. Rollout¹ Bar/24(2) 6/5(2) eq:-0.032
Player: 50.02% (G:14.29% B:0.65%)
Opponent: 49.98% (G:16.73% B:1.21%)
Confidence: ±0.008 (-0.040..-0.023) - [84.9%]

2. Rollout¹ Bar/24 Bar/23* 21/20 eq:-0.038 (-0.007)
Player: 48.65% (G:13.17% B:0.55%)
Opponent: 51.35% (G:12.09% B:0.57%)
Confidence: ±0.009 (-0.047..-0.029) - [14.9%]

3. Rollout¹ Bar/24 Bar/23* 23/22 eq:-0.049 (-0.017)
Player: 48.36% (G:13.06% B:0.57%)
Opponent: 51.64% (G:12.65% B:0.64%)
Confidence: ±0.009 (-0.058..-0.040) - [0.1%]

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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