On 2/8/2024 1:13 PM, [email protected] wrote:

And in backgammon, 2A 1A Crawford is the same score as 3A 1A post-Crawford. With my interest (and relative strength) in backgammon, it's surprising
I've never come across that fact or heard it anywhere else.
It suddenly dawned on me and appears true.

It's mentioned here for example:

https://www.bkgm.com/gloss/lookup.cgi?gammon+go

Technically, the two scores aren't exactly the same, because at
3-away post-Crawford, you can try "the trick."

https://www.bkgm.com/rgb/rgb.cgi?view+437

---
Tim Chow

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Timothy Chow <[email protected]> wrote:

...
Technically, the two scores aren't exactly the same, because at
3-away post-Crawford, you can try "the trick."

https://www.bkgm.com/rgb/rgb.cgi?view+437

But what if you get a lucky roll and the position turns *very*
gammonish? Then the waiting to double trick backfires.

--bks

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On 2/9/2024 9:31 AM, Bradley K. Sherman wrote:

Timothy Chow <[email protected]> wrote:

...
Technically, the two scores aren't exactly the same, because at
3-away post-Crawford, you can try "the trick."

https://www.bkgm.com/rgb/rgb.cgi?view+437

But what if you get a lucky roll and the position turns *very*
gammonish? Then the waiting to double trick backfires.

Yes. Here's an example from Gus Hansen versus Bob Koca.

https://vimeo.com/10287279#t=2471

The commentators (one of whom I think was Sander Lyllof) thought
that Bob Koca's pass was a blunder, but XG says the pass was correct.

XGID=aaBBc-B-C---aD--AAcdb-----:0:0:1:00:10:12:0:13:10

Score is X:10 O:12 13 pt.(s) match.
+24-23-22-21-20-19------18-17-16-15-14-13-+
| O O | | O X X X |
| O O | | O X |
| O | | O X |
| O | | X |
| | | |
| |BAR| |
| | O | |
| | | |
| O | | X |
| X X O X | | X |
| O X X O X | | X O |
+-1--2--3--4--5--6-------7--8--9-10-11-12-+
Pip count X: 131 O: 180 X-O: 10-12/13
Cube: 1
X on roll, cube action

Analyzed in XG Roller++
Player Winning Chances: 66.08% (G:36.87% B:2.18%)
Opponent Winning Chances: 33.92% (G:5.64% B:0.27%)

Cubeful Equities:
No double: +0.921 (-0.079)
Double/Take: +1.148 (+0.148)
Double/Pass: +1.000

Best Cube action: Double / Pass

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

---
Tim Chow

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On 2/10/2024 5:26 AM, [email protected] wrote:

So I think that "G" in XG-speak means "at least a gammon".

Yes, that's right. You can confirm this by setting up a position
with a lot of backgammons.

Thanks for the spelling correction of Lylloff's name. I also agree
with your other assessment that the take point (if there are no
gammons) is slightly over 2%, and not 1%.

---
Tim Chow

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