My "Backgammon Rules of Thumb" at https://docs.google.com/document/d/1kL8S4H7rJaAHnUhrTJc0fGcIH5-eo7cMXqvvt6-wWig/edit
includes Dimitri's Rule:
Dimitri's Rule: “Never double without a new point in your home board.” (there are exceptions)
I don't remember where I got this, don't know who Dimitri might be, and can't find any mention of it anywhere via an internet search.
It's certainly overstated, but the fact that we have a phase for its exceptions ("pointless double") indicates that there is some sort of
general rule for there to be exceptions to.
Perhaps something like this would be better:
"You usually need to own at least one additional point in your home
board to double, but there are many exceptions."
My "Backgammon Rules of Thumb" at https://docs.google.com/document/d/1kL8S4H7rJaAHnUhrTJc0fGcIH5-eo7cMXqvvt6-wWig/edit
includes Dimitri's Rule:
Dimitri's Rule: “Never double without a new point in your home board.” (there are exceptions)
I don't remember where I got this, don't know who Dimitri might be, and can't find any mention of it anywhere via an internet search.
It's certainly overstated, but the fact that we have a phase for its exceptions ("pointless double") indicates that there is some sort of
general rule for there to be exceptions to.
Perhaps something like this would be better:
"You usually need to own at least one additional point in your home
board to double, but there are many exceptions."
Are you sure you didn't misspell his name too and it's from Dmitriy Obukhov? That would be my guess if the name wasn't misspelled. He helps run the BMAB and is active enough online/in bg.
I have no memory of where I saw this, where it came from, who
Dimetry/Dmitriy is, so zero confidence that I spelled it right.
On 1/11/2022 9:42 am, ah....Clem wrote:
I have no memory of where I saw this, where it came from, who
Dimetry/Dmitriy is, so zero confidence that I spelled it right.
Dmitriy is the CEO of BMAB, you can contact him through the BMAB
website.
https://bgmastersab.com/contact
he's not the type to promulgate "rules" of this type
On 10/31/2022 8:19 PM, Simon Woodhead wrote:...
On 1/11/2022 9:42 am, ah....Clem wrote:
I have no memory of where I saw this, where it came from, who
Dimetry/Dmitriy is, so zero confidence that I spelled it right.
Dmitriy is the CEO of BMAB, you can contact him through the BMAB
website.
https://bgmastersab.com/contactI'd be rather surprised if it turned out to be Dmitriy, because my
impression is that he's not the type to promulgate "rules" of this
type. There is one piece of wisdom that I associate with Dmitriy,
which is his insistence that everyone learns differently, and so it
makes no sense to try to shoehorn everyone into a one-size-fits-all
coaching framework. I find this to be true not just for backgammon,
but for almost every skilled activity, and am continually amazed at
how often this nugget of wisdom is ignored. In any case, that's why
I would be surprised if Dmitriy champions such a sweeping
generalization.
Timothy Chow <tchow12000@yahoo.com> writes:
he's not the type to promulgate "rules" of this type
As you know, I am this type, especially to bring beginners up to
speed. There is a highly recommended book about "satisficing" in
decision theory: "Simple heuristics that make us smart". One of my
many projects in the pipeline is "Backgammon by rules of thumb". So I
belong to "that" party. (-:
Timothy Chow <tchow...@yahoo.com> writes:
he's not the type to promulgate "rules" of this type
I just quickly browsed through a long session of GNU
Backgammon playing my mutant doubling bot. It took
481 games to come up with 10 doubles by gnubg that
had NOT made an additional home point....
Then a small Unix command line showed for the full
session of 3000 games the following results:
| 1 | 88 | 2 | 529 | 3 | 715 | 4 | 465 | 5 | 242 | 6 | 47 |
Of the 88 doubles in the first row, 19 were pure races,
so only 69 contact doubles without an additional home
board happened. Out of 2098 doubles.
Only 1 exception about every 30 games is a very good
rule of thumb.
To be clear, my praise of Dmitriy's principle that "everyone
is different" does not mean that I denigrate rules of thumb.
I use many myself. Your study of racing cubes is highly
valuable; it is not humanly possible to make such decisions
well without some kind of heuristics. What I would say,
though, is that the value of a particular rule of thumb will vary
from player to player. Some players might find a particular
rule of thumb useful, while others might not. Some players
might use lots of explicit heuristics while others might use
only a few, relying mostly on general intuition, or maybe on
a large stock of memorized reference positions. Even in the
case of racing cubes, where you need *some* rules, different
people may choose different rules; some may follow their
chosen rule to the letter, while others may make exceptions.
And so on.
In the case of "pointless doubles," I would say that the value
of the rule for a particular person depends on whether the
player is overly inclined to double prematurely. If you're
coaching a player and you notice that they player is doubling
prematurely a lot, then it might indeed be valuable to say,
"Don't double when you haven't made any new home-board
points." It really depends more on the player's predilections
than on statistics of how often the rule holds. For a different
player, who is too hesitant to double, it might be more valuable
to have some rules of thumb about when one *should* double
with only a one-point board.
I'm glad you still have those games. You didn't want to share them
because the files were too large. Since processing time seems to not
be an issue for you, why not run another "small Unix command line" to
reopen them and export/save them in a compact text format so that you
can make it available for us to download?
"don't double if you have 6-point board" is a very good rule of dumb?
MK <mu...@compuplus.net> writes:
[session of 3000 games]
I'm glad you still have those games. You didn't want
to share them because the files were too large.
Since processing time seems to not be an issue for
you, why not run another "small Unix command line"
to reopen them and export/save them in a compact
text format so that you can make it available for us
to download?
Because I will not work for you, let alone on a task
that is trivial to do on your own.
"don't double if you have 6-point board" is a very
good rule of dumb?
The numbers (47 cases) are small because in most
cases a double occured earlier, with 1 to 5 points
made. Big surprise.
On November 5, 2022 at 2:13:51 AM UTC-6, Axel Reichert wrote:
You did your "mutant" experiment apparently not to discover and learn something new but to prove me wrong, which just fine. But your results instead did prove me right.
You find 88 doubles out of 2098 rare enough to come up with a "rule of
dumb"
MK <mu...@compuplus.net> writes:
On November 5, 2022 at 2:13:51 AM UTC-6, Axel Reichert wrote:
You did your "mutant" experiment apparently not to
discover and learn something new but to prove me
wrong, which just fine. But your results instead did
prove me right.
Aha. And the earth is flat.
You find 88 doubles out of 2098 rare enough to come
up with a "rule of dumb"
No, I find (529+715+465+242+47)/2098 = 1998/2098
convincing enough.
Sysop: | Keyop |
---|---|
Location: | Huddersfield, West Yorkshire, UK |
Users: | 297 |
Nodes: | 16 (2 / 14) |
Uptime: | 20:06:59 |
Calls: | 6,667 |
Calls today: | 1 |
Files: | 12,216 |
Messages: | 5,337,141 |