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interests / rec.games.backgammon / Six-primed

SubjectAuthor
* Six-primedTimothy Chow
+* Re: Six-primedah....Clem
|`- Re: Six-primedStick Rice
`- Rollout: Six-primedTimothy Chow

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Six-primed

<ugramr$btvi$4@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Six-primed
Date: Thu, 19 Oct 2023 09:24:42 -0400
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 by: Timothy Chow - Thu, 19 Oct 2023 13:24 UTC

XGID=--bABCD--A---B--bbcbbbB---:1:1:1:62:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O O | | O O O X |
| X O O O | | O O O X |
| O | | |
| | | |
| | | |
| |BAR| |
| | | |
| | | X |
| | | X X | +---+
| | | X X X O | | 2 |
| X | | X X X X O | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 129 O: 131 X-O: 0-0
Cube: 2, X own cube
X to play 62

---
Tim Chow

Re: Six-primed

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: Re: Six-primed
Date: Thu, 19 Oct 2023 10:36:12 -0400
Organization: The Future Fair
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 by: ah....Clem - Thu, 19 Oct 2023 14:36 UTC

On 10/19/2023 9:24 AM, Timothy Chow wrote:
> XGID=--bABCD--A---B--bbcbbbB---:1:1:1:62:0:0:0:0:10
>
> Score is X:0 O:0. Unlimited Game
>  +13-14-15-16-17-18------19-20-21-22-23-24-+
>  | X        O  O  O |   | O  O  O  X       |
>  | X        O  O  O |   | O  O  O  X       |
>  |                O |   |                  |
>  |                  |   |                  |
>  |                  |   |                  |
>  |                  |BAR|                  |
>  |                  |   |                  |
>  |                  |   | X                |
>  |                  |   | X  X             | +---+
>  |                  |   | X  X  X     O    | | 2 |
>  |          X       |   | X  X  X  X  O    | +---+
>  +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 129  O: 131 X-O: 0-0
> Cube: 2, X own cube
> X to play 62

If this was GS, I'd cover the blot on the three and play 6/4. But it's
not and the way to win this game is to counterprime and hope O crunches.
So, I'll make the bar point despite the additional gammon losses.

13/7 9/7.

--
Ah....Clem
The future is fun, the future is fair.

Re: Six-primed

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Subject: Re: Six-primed
From: bananabo...@gmail.com (Stick Rice)
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 by: Stick Rice - Thu, 19 Oct 2023 21:16 UTC

On Thursday, October 19, 2023 at 10:36:16 AM UTC-4, ah....Clem wrote:
> On 10/19/2023 9:24 AM, Timothy Chow wrote:
> > XGID=--bABCD--A---B--bbcbbbB---:1:1:1:62:0:0:0:0:10
> >
> > Score is X:0 O:0. Unlimited Game
> > +13-14-15-16-17-18------19-20-21-22-23-24-+
> > | X O O O | | O O O X |
> > | X O O O | | O O O X |
> > | O | | |
> > | | | |
> > | | | |
> > | |BAR| |
> > | | | |
> > | | | X |
> > | | | X X | +---+
> > | | | X X X O | | 2 |
> > | X | | X X X X O | +---+
> > +12-11-10--9--8--7-------6--5--4--3--2--1-+
> > Pip count X: 129 O: 131 X-O: 0-0
> > Cube: 2, X own cube
> > X to play 62
> If this was GS, I'd cover the blot on the three and play 6/4. But it's
> not and the way to win this game is to counterprime and hope O crunches.
> So, I'll make the bar point despite the additional gammon losses.
>
> 13/7 9/7.
>
> --
> Ah....Clem
> The future is fun, the future is fair.

Best way not to get gammoned is to win the game.

Stick

Rollout: Six-primed

<uh5qar$352a2$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: Six-primed
Date: Mon, 23 Oct 2023 08:52:42 -0400
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 by: Timothy Chow - Mon, 23 Oct 2023 12:52 UTC

XGID=--bABCD--A---B--bbcbbbB---:1:1:1:62:0:0:0:0:10

Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O O | | O O O X |
| X O O O | | O O O X |
| O | | |
| | | |
| | | |
| |BAR| |
| | | |
| | | X |
| | | X X | +---+
| | | X X X O | | 2 |
| X | | X X X X O | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 129 O: 131 X-O: 0-0
Cube: 2, X own cube
X to play 62

Both 9/3 6/4 and 13/7 9/7 make a four-prime, but 13/7 9/7 leaves a
direct shot. So why isn't 9/3 6/4 better? In a priming battle such
as this one, the quality of the prime matters more than shots. After
9/3 6/4 or 9/3 13/11, it's hard for X to extend his prime. But 13/7
9/7 uses his outfield checkers very efficiently, and gives X good
chances of making a five-prime if he's missed. And if O rolls an ace?
Well, O can't hit with 41 without breaking her six-prime, and since
O has only a three-point board, X has a good chance of entering and
perhaps making his own 3pt eventually anyway, using his spares.

1. Rollout¹ 13/7 9/7 eq:-0.201
Player: 35.88% (G:8.71% B:0.29%)
Opponent: 64.12% (G:13.15% B:0.46%)
Confidence: ±0.009 (-0.210..-0.192) - [100.0%]

2. Rollout¹ 9/3 6/4 eq:-0.344 (-0.144)
Player: 30.29% (G:6.64% B:0.22%)
Opponent: 69.71% (G:11.04% B:0.40%)
Confidence: ±0.008 (-0.352..-0.337) - [0.0%]

3. Rollout¹ 13/11 9/3 eq:-0.358 (-0.157)
Player: 29.93% (G:6.67% B:0.23%)
Opponent: 70.07% (G:11.52% B:0.38%)
Confidence: ±0.008 (-0.366..-0.350) - [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

interests / rec.games.backgammon / Six-primed

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