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interests / rec.games.backgammon / Bearing off with contact

SubjectAuthor
* Bearing off with contactTimothy Chow
+- Re: Bearing off with contactpeps...@gmail.com
`- Rollout: Bearing off with contactTimothy Chow

1
Bearing off with contact

<t8v3k2$a0u$3@dont-email.me>

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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: Bearing off with contact
Date: Wed, 22 Jun 2022 08:57:37 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Wed, 22 Jun 2022 12:57 UTC

XGID=-BBaBBD------a-----bbcbbb-:1:-1:1:32:0:0:0:0:10

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 O O | +---+
| | | O O O O O O | | 2 |
| | | O | +---+
| | | |
| | | |
| |BAR| |
| | | |
| | | X |
| | | X |
| | | X X X X X |
| | | X X X O X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 48 O: 80 X-O: 0-0
Cube: 2, O own cube
X to play 32

---
Tim Chow

Re: Bearing off with contact

<3645d861-945f-4d1f-a145-c72838a444bdn@googlegroups.com>

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Newsgroups: rec.games.backgammon
Date: Wed, 22 Jun 2022 08:35:31 -0700 (PDT)
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Subject: Re: Bearing off with contact
From: pepste...@gmail.com (peps...@gmail.com)
Injection-Date: Wed, 22 Jun 2022 15:35:33 +0000
Content-Type: text/plain; charset="UTF-8"
 by: peps...@gmail.com - Wed, 22 Jun 2022 15:35 UTC

On Wednesday, June 22, 2022 at 1:57:40 PM UTC+1, Tim Chow wrote:
> XGID=-BBaBBD------a-----bbcbbb-:1:-1:1:32:0:0:0:0:10
>
> 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 O O | +---+
> | | | O O O O O O | | 2 |
> | | | O | +---+
> | | | |
> | | | |
> | |BAR| |
> | | | |
> | | | X |
> | | | X |
> | | | X X X X X |
> | | | X X X O X X |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 48 O: 80 X-O: 0-0
> Cube: 2, O own cube
> X to play 32

I want to watch the next episode of the DMP Rule Show!
The candidate plays are 6/1, 6/3*/1 and 4/2 4/1.
6/3*/1 is by far the most natural play.
But Tim does have a QF bias. Even if he says, he does some anti-QF posts,
I think that excellence in his classes is helped with a bit of QF common sense.
So, by QF logic, 4/2 4/1 must be right.
It does less shotleaving than the other plays.
Note that if 4/2 4/1 is right here, it must be super-right when we don't care about gammons.
4/2 4/1 is my play but I would never do this OTB.

Paul

Rollout: Bearing off with contact

<t99o8d$3u5hn$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Bearing off with contact
Date: Sun, 26 Jun 2022 09:51:07 -0400
Organization: A noiseless patient Spider
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 by: Timothy Chow - Sun, 26 Jun 2022 13:51 UTC

XGID=-BBaBBD------a-----bbcbbb-:1:-1:1:32:0:0:0:0:10

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 O O | +---+
| | | O O O O O O | | 2 |
| | | O | +---+
| | | |
| | | |
| |BAR| |
| | | |
| | | X |
| | | X |
| | | X X X X X |
| | | X X X O X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 48 O: 80 X-O: 0-0
Cube: 2, O own cube
X to play 32

This is a bad roll (only 63 is worse, according to XG). X is faced
with a choice between the lesser of two evils: create an interior
gap on the 4pt, or leave himself with a single spare checker on
the 6pt. Neither option is pleasant, but it's important to note
that there is a good chance that O will have to leave soon. This
tips the balance in favor of 4/2 4/1, since 6/1 has greater blotting
risk in the short term. See the variant for comparison.

Note that 6/3*/1 is the wrong idea, since that creates longer-term
blotting risk without enough extra gammons to compensate.

1. Rollout¹ 4/2 4/1 eq:+0.827
Player: 91.73% (G:1.95% B:0.01%)
Opponent: 8.27% (G:0.00% B:0.00%)
Confidence: ±0.002 (+0.825..+0.829) - [100.0%]

2. Rollout¹ 6/1 eq:+0.793 (-0.034)
Player: 90.51% (G:1.83% B:0.01%)
Opponent: 9.49% (G:0.00% B:0.00%)
Confidence: ±0.002 (+0.791..+0.795) - [0.0%]

3. Rollout¹ 6/3* 3/1 eq:+0.685 (-0.142)
Player: 84.07% (G:6.14% B:0.04%)
Opponent: 15.93% (G:0.00% B:0.00%)
Confidence: ±0.002 (+0.683..+0.687) - [0.0%]

¹ 1296 Games rolled with Variance Reduction.
Dice Seed: 271828
Moves: 4-ply, cube decisions: XG Roller+
Search interval: Large

eXtreme Gammon Version: 2.19.207.pre-release

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

XGID=-BBbBBD------------bbcbbb-:1:-1:1:32:0:0:0:0:10

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 O | +---+
| | | O O O O O O | | 2 |
| | | O | +---+
| | | |
| | | |
| |BAR| |
| | | |
| | | X |
| | | X |
| | | X X X O X X |
| | | X X X O X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 48 O: 90 X-O: 0-0
Cube: 2, O own cube
X to play 32

1. Rollout¹ 6/1 eq:+0.773
Player: 87.91% (G:6.18% B:0.04%)
Opponent: 12.09% (G:0.00% B:0.00%)
Confidence: ±0.002 (+0.771..+0.775) - [54.6%]

2. Rollout¹ 4/2 4/1 eq:+0.773
Player: 87.88% (G:6.03% B:0.04%)
Opponent: 12.12% (G:0.00% B:0.00%)
Confidence: ±0.002 (+0.771..+0.774) - [45.4%]

¹ 2592 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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