Message-ID:

Conscience is a mother-in-law whose visit never ends. -- H. L. Mencken

interests / rec.games.backgammon / Double hit?

Double hit?

<t3ma1u$81e$2@dont-email.me>

https://www.novabbs.com/interests/article-flat.php?id=8580&group=rec.games.backgammon#8580

copy link Newsgroups: rec.games.backgammon

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: Double hit?
Date: Tue, 19 Apr 2022 08:30:53 -0400
Organization: A noiseless patient Spider
Lines: 23
Message-ID: <t3ma1u$81e$2@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Tue, 19 Apr 2022 12:30:54 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="775c3c70052275899421a1149a82bab1";
logging-data="8238"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/y8Lyk0vd6iIVGrDrCHcda7FowRyxswdI="
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
Thunderbird/91.8.0
Cancel-Lock: sha1:HlH4dOjFH6X1nPCiAhiCm5lL7UM=
Content-Language: en-US

by: Timothy Chow - Tue, 19 Apr 2022 12:30 UTC

XGID=-AB-aBBBB----B-a-bcbdB-b--:0:0:1:63:0:0:0:0:10

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 O X O |
| X O O | | O O X O |
| O | | O |
| | | O |
| | | |
| |BAR| |
| | | |
| | | |
| | | |
| 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: 125 O: 104 X-O: 0-0
Cube: 1
X to play 63

---
Tim Chow

Rollout: Double hit?

<t3rmam$dbf$1@dont-email.me>

copy mid

https://www.novabbs.com/interests/article-flat.php?id=8642&group=rec.games.backgammon#8642

copy link Newsgroups: rec.games.backgammon

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: Rollout: Double hit?
Date: Thu, 21 Apr 2022 09:31:00 -0400
Organization: A noiseless patient Spider
Lines: 53
Message-ID: <t3rmam$dbf$1@dont-email.me>
References: <t3ma1u$81e$2@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Thu, 21 Apr 2022 13:31:02 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="83a347872a046bae23c3588c81d719ed";
logging-data="13679"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/Zpqltf+F0BWG0gxUZcVRnJhwFb+a+84g="
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
Thunderbird/91.8.0
Cancel-Lock: sha1:crdZ+dWmntpUP3kW54BeXgdDXgU=
In-Reply-To: <t3ma1u$81e$2@dont-email.me>
Content-Language: en-US

by: Timothy Chow - Thu, 21 Apr 2022 13:31 UTC

XGID=-AB-aBBBB----B-a-bcbdB-b--:0:0:1:63:0:0:0:0:10

Hitting twice is of course the most gammonish play, and XG plays it
at gammon go. In fact, XG hits twice at DMP as well. However, hitting
twice also loses a lot of gammons, and for money, the rollout below
puts 7/1 7/4* clearly on top.

Another candidate is 21/15*/12. This gains more pips, sends a second
checker back, and keeps the four-prime. But it dangerously breaks
anchor while leaving a blot on the 1pt and forgoing a four-point board.

1. Rollout¹ 7/1 7/4* eq:+0.224
Player: 53.07% (G:20.21% B:0.28%)
Opponent: 46.93% (G:11.34% B:0.44%)
Confidence: ±0.006 (+0.218..+0.230) - [100.0%]

2. Rollout¹ 21/15* 7/4* eq:+0.135 (-0.089)
Player: 54.65% (G:23.46% B:0.51%)
Opponent: 45.35% (G:24.70% B:3.38%)
Confidence: ±0.011 (+0.124..+0.145) - [0.0%]

3. Rollout¹ 21/15* 15/12 eq:+0.098 (-0.126)
Player: 52.93% (G:16.25% B:0.46%)
Opponent: 47.07% (G:20.07% B:0.94%)
Confidence: ±0.013 (+0.085..+0.111) - [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

Subject	Author
Double hit?	Timothy Chow
Rollout: Double hit?	Timothy Chow