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interests / rec.games.backgammon / Unlikely gammon

Unlikely gammon

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Unlikely gammon
Date: Thu, 28 Dec 2023 08:57:30 -0500
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by: Timothy Chow - Thu, 28 Dec 2023 13:57 UTC

Just for amusement...

I was playing XG. In the position below, I played 22/21 9/5, and
then XG proceeded to win a gammon, *without ever hitting*. Over
the course of the next 11 rolls, I rolled a total of 61 pips (so
about 5.5 pips per roll). Meanwhile, over the next 9 rolls, XG
rolled 109 pips, averaging about 12 pips per roll.

The bot info below suggests that a gammon win for O is not all
that unlikely (around 3%), but I suspect that most of those
gammons involve some hitting at some point.

XGID=-B-BB-B--B--bBa--dbdbBA---:1:1:1:41:0:0:0:7:10

Score is X:0 O:0 7 pt.(s) match.
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O O | | O O X X |
| X O O | | O O X |
| O | | O |
| O | | O |
| | | |
| |BAR| |
| | | |
| | | |
| | | | +---+
| O X | | X X X X | | 2 |
| O X | | X X X X | +---+
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 136 O: 117 X-O: 0-0/7
Cube: 2, X own cube
X to play 41

1. 4-ply 22/21 9/5 eq:-0.490
Player: 22.84% (G:1.08% B:0.01%)
Opponent: 77.16% (G:3.45% B:0.05%)

eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2

---
Tim Chow