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interests / rec.games.backgammon / It's a blitz!

SubjectAuthor
* It's a blitz!Timothy Chow
+- Re: It's a blitz!Stick Rice
`- Rollout: It's a blitz!Timothy Chow

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It's a blitz!

<unnmfk$2rpc2$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: It's a blitz!
Date: Wed, 10 Jan 2024 22:14:55 -0500
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 by: Timothy Chow - Thu, 11 Jan 2024 03:14 UTC

XGID=bBB-C-BA-A--cA-b-c-cbB--A-:1:-1:1:51:0:0:0:0:10

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 X X | +---+
| O O | | O O X | | 2 |
| O | | O | +---+
| | | |
| | | |
| |BAR| |
| | O | |
| | O | |
| O | | X |
| O | | X X X X |
| O X X | | X X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 125 O: 161 X-O: 0-0
Cube: 2, O own cube
X to play 51

---
Tim Chow

Re: It's a blitz!

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Subject: Re: It's a blitz!
From: bananabo...@gmail.com (Stick Rice)
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 by: Stick Rice - Thu, 11 Jan 2024 23:14 UTC

On Wednesday, January 10, 2024 at 10:15:02 PM UTC-5, Timothy Chow wrote:
> XGID=bBB-C-BA-A--cA-b-c-cbB--A-:1:-1:1:51:0:0:0:0:10
>
> 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 X X | +---+
> | O O | | O O X | | 2 |
> | O | | O | +---+
> | | | |
> | | | |
> | |BAR| |
> | | O | |
> | | O | |
> | O | | X |
> | O | | X X X X |
> | O X X | | X X X X |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count X: 125 O: 161 X-O: 0-0
> Cube: 2, O own cube
> X to play 51
>
> ---
> Tim Chow

The five has to be off the anchor and the best ace after that is 7/6. Playing 13/8would be quite the overplay.

Stick

Rollout: It's a blitz!

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Rollout: It's a blitz!
Date: Tue, 16 Jan 2024 08:42:42 -0500
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 by: Timothy Chow - Tue, 16 Jan 2024 13:42 UTC

XGID=bBB-C-BA-A--cA-b-c-cbB--A-:1:-1:1:51:0:0:0:0:10

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 X X | +---+
| O O | | O O X | | 2 |
| O | | O | +---+
| | | |
| | | |
| |BAR| |
| | O | |
| | O | |
| O | | X |
| O | | X X X X |
| O X X | | X X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 125 O: 161 X-O: 0-0
Cube: 2, O own cube
X to play 51

The normal approach in a blitz is to keep bringing down more ammunition
to try to complete the closeout. But if you have several builders
already and your back checkers are somewhat hemmed in, then at some
point you need to start freeing those checkers, lest you roll something
awkward and are forced to collapse.

If X's checkers on his 21pt were split then jumping out would not be so
urgent (see variant below).

1. Rollout¹ 21/16 7/6 eq:+0.636
Player: 67.33% (G:50.93% B:0.30%)
Opponent: 32.67% (G:7.89% B:0.50%)
Confidence: ±0.010 (+0.626..+0.646) - [100.0%]

2. Rollout¹ 21/16 9/8 eq:+0.594 (-0.042)
Player: 66.03% (G:50.15% B:0.29%)
Opponent: 33.97% (G:8.98% B:0.62%)
Confidence: ±0.012 (+0.582..+0.606) - [0.0%]

3. Rollout¹ 24/23 21/16 eq:+0.572 (-0.064)
Player: 65.83% (G:49.46% B:0.30%)
Opponent: 34.17% (G:9.07% B:0.62%)
Confidence: ±0.011 (+0.562..+0.583) - [0.0%]

4. Rollout¹ 21/16 4/3 eq:+0.532 (-0.104)
Player: 64.58% (G:49.47% B:0.31%)
Opponent: 35.42% (G:10.90% B:0.95%)
Confidence: ±0.011 (+0.521..+0.543) - [0.0%]

5. Rollout¹ 24/18 eq:+0.518 (-0.118)
Player: 64.64% (G:46.38% B:0.29%)
Opponent: 35.36% (G:9.04% B:0.52%)
Confidence: ±0.010 (+0.509..+0.528) - [0.0%]

6. Rollout¹ 13/8 7/6 eq:+0.474 (-0.162)
Player: 63.14% (G:46.22% B:0.28%)
Opponent: 36.86% (G:8.78% B:0.46%)
Confidence: ±0.012 (+0.462..+0.487) - [0.0%]

7. Rollout¹ 13/8 4/3 eq:+0.466 (-0.171)
Player: 62.69% (G:46.75% B:0.22%)
Opponent: 37.31% (G:10.02% B:0.52%)
Confidence: ±0.011 (+0.454..+0.477) - [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

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

XGID=bBB-C-BA-A--cA-b-c-cbAA-A-:1:-1:1:51:0:0:0:0:10

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 X X X | +---+
| O O | | O O | | 2 |
| O | | O | +---+
| | | |
| | | |
| |BAR| |
| | O | |
| | O | |
| O | | X |
| O | | X X X X |
| O X X | | X X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 126 O: 161 X-O: 0-0
Cube: 2, O own cube
X to play 51

1. Rollout¹ 21/16 7/6 eq:+0.624
Player: 66.84% (G:51.67% B:0.29%)
Opponent: 33.16% (G:8.86% B:0.63%)
Confidence: ±0.010 (+0.615..+0.634) - [90.8%]

2. Rollout¹ 21/16 9/8 eq:+0.612 (-0.012)
Player: 66.47% (G:51.28% B:0.28%)
Opponent: 33.53% (G:9.51% B:0.75%)
Confidence: ±0.009 (+0.604..+0.621) - [2.5%]

3. Rollout¹ 24/23 21/16 eq:+0.612 (-0.013)
Player: 66.62% (G:51.71% B:0.30%)
Opponent: 33.38% (G:9.55% B:0.84%)
Confidence: ±0.010 (+0.602..+0.622) - [2.8%]

4. Rollout¹ 22/16 eq:+0.610 (-0.014)
Player: 66.54% (G:50.78% B:0.30%)
Opponent: 33.46% (G:8.62% B:0.60%)
Confidence: ±0.010 (+0.600..+0.621) - [2.1%]

5. Rollout¹ 13/8 7/6 eq:+0.610 (-0.015)
Player: 66.38% (G:51.16% B:0.30%)
Opponent: 33.62% (G:8.49% B:0.50%)
Confidence: ±0.011 (+0.599..+0.621) - [1.8%]

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

interests / rec.games.backgammon / It's a blitz!

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