novaBBS - rec.games.backgammon

62 to play

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: 62 to play
Date: Fri, 14 May 2021 09:40:30 -0400
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by: Timothy Chow - Fri, 14 May 2021 13:40 UTC

XGID=---aBBD-B---dC---bbb--bBb-:0:0:1:62:0:0:0:0:10

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 | | O O X O |
| X O O | | O O X O |
| X | | |
| | | |
| | | |
| |BAR| |
| | | |
| O | | X |
| O | | X |
| O X | | X X X |
| O X | | X X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 143 O: 124 X-O: 0-0
Cube: 1
X to play 62

---
Tim Chow

Re: 62 to play

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From: ah_c...@ymail.com (ah...Clem)
Newsgroups: rec.games.backgammon
Subject: Re: 62 to play
Date: Fri, 14 May 2021 10:29:13 -0400
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by: ah...Clem - Fri, 14 May 2021 14:29 UTC

On 5/14/2021 9:40 AM, Timothy Chow wrote:
> XGID=---aBBD-B---dC---bbb--bBb-:0:0:1:62:0:0:0:0:10
>
> 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 |   | O        O X O |
> | X           O O |   | O        O X O |
> | X                |   |                  |
> |                  |   |                  |
> |                  |   |                  |
> |                  |BAR|                  |
> |                  |   |                  |
> | O                |   | X                |
> | O                |   | X                |
> | O           X    |   | X X X          |
> | O           X    |   | X X X O       |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 143 O: 124 X-O: 0-0
> Cube: 1
> X to play 62

X is behind in the race so Pottling is probably not ideal. Nor is
dumping behind the runner. 13/7 6/4 is the pure play and while riskier
than 13/5 seems to give more winning chances, and with the anchor
gammons should be relatively rare.

OTB I'd probably just play to the five point without over thinking it.

13/7 6/4.

Re: 62 to play

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From: REMOVETH...@gmail.com (badgolferman)
Newsgroups: rec.games.backgammon
Subject: Re: 62 to play
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by: badgolferman - Fri, 14 May 2021 19:20 UTC

Timothy Chow wrote:

>XGID=---aBBD-B---dC---bbb--bBb-:0:0:1:62:0:0:0:0:10
>
>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 | | O O X O |
> | X O O | | O O X O |
> | X | | |
> | | | |
> | | | |
> | |BAR| |
> | | | |
> | O | | X |
> | O | | X |
> | O X | | X X X |
> | O X | | X X X O |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
>Pip count X: 143 O: 124 X-O: 0-0
>Cube: 1
>X to play 62
>
>---
>Tim Chow

I would probably play 13/9(2). Leaving the midpoint susceptible is
worth blocking sixes to me.

Re: 62 to play

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From: REMOVETH...@gmail.com (badgolferman)
Newsgroups: rec.games.backgammon
Subject: Re: 62 to play
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by: badgolferman - Fri, 14 May 2021 19:23 UTC

badgolferman wrote:

>Timothy Chow wrote:
>
>>XGID=---aBBD-B---dC---bbb--bBb-:0:0:1:62:0:0:0:0:10
>>
>>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 | | O O X O |
>> | X O O | | O O X O |
>> | X | | |
>> | | | |
>> | | | |
>> | |BAR| |
>> | | | |
>> | O | | X |
>> | O | | X |
>> | O X | | X X X |
>> | O X | | X X X O |
>> +12-11-10--9--8--7-------6--5--4--3--2--1-+
>>Pip count X: 143 O: 124 X-O: 0-0
>>Cube: 1
>>X to play 62
>>
>>---
>>Tim Chow
>
>
>I would probably play 13/9(2). Leaving the midpoint susceptible is
>worth blocking sixes to me.

I don't know why but I saw 22 as the roll hence the previous play.

For 62 I will play 13/5 instead.

Rollout: 62 to play

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: 62 to play
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by: Timothy Chow - Mon, 17 May 2021 00:35 UTC

XGID=---aBBD-B---dC---bbb--bBb-:0:0:1:62:0:0:0:0:10

X is far enough behind in the pip count that he needs to be
aggressive in his priming/containment strategy.

1. Rollout¹ 13/7 6/4 eq:-0.069
Player: 47.42% (G:15.09% B:0.46%)
Opponent: 52.58% (G:11.46% B:0.48%)
Confidence: ±0.014 (-0.083..-0.055) - [100.0%]

2. Rollout¹ 13/5 eq:-0.142 (-0.073)
Player: 44.99% (G:14.63% B:0.37%)
Opponent: 55.01% (G:10.38% B:0.45%)
Confidence: ±0.013 (-0.155..-0.130) - [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

Re: 62 to play

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Subject: Re: 62 to play
From: bananabo...@gmail.com (Stick Rice)
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by: Stick Rice - Mon, 17 May 2021 20:59 UTC

On Friday, May 14, 2021 at 10:29:18 AM UTC-4, ah...Clem wrote:
> On 5/14/2021 9:40 AM, Timothy Chow wrote:
> > XGID=---aBBD-B---dC---bbb--bBb-:0:0:1:62:0:0:0:0:10
> >
> > 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 | | O O X O |
> > | X O O | | O O X O |
> > | X | | |
> > | | | |
> > | | | |
> > | |BAR| |
> > | | | |
> > | O | | X |
> > | O | | X |
> > | O X | | X X X |
> > | O X | | X X X O |
> > +12-11-10--9--8--7-------6--5--4--3--2--1-+
> > Pip count X: 143 O: 124 X-O: 0-0
> > Cube: 1
> > X to play 62
> X is behind in the race so Pottling is probably not ideal. Nor is
> dumping behind the runner. 13/7 6/4 is the pure play and while riskier
> than 13/5 seems to give more winning chances, and with the anchor
> gammons should be relatively rare.
>
> OTB I'd probably just play to the five point without over thinking it.
>
> 13/7 6/4.

*Pottling* should only be used when discussing one and only one checker back. In fact, if there was only one checker back here and the race was roughly the same I imagine running would be right.

https://bkgm.com/glossary.html#P

Pottle's Law
[Named for backgammon player Sam Pottle.] "Always run the last checker." If you have only one checker back, the best move is usually to run that checker. See post by Stick Rice.

Stick

You are confused; but this is your normal state.

interests / rec.games.backgammon / 62 to play

Subject	Author
62 to play	Timothy Chow
Re: 62 to play	ah...Clem
Re: 62 to play	Stick Rice
Re: 62 to play	badgolferman
Re: 62 to play	badgolferman
Rollout: 62 to play	Timothy Chow