Miscellaneous

 Notation

 From: Dean Gay Address: demiga@hotmail.com Date: 24 February 2000 Subject: Re: Opening Move Variations Forum: rec.games.backgammon Google: 38b57452.108615369@news.mindspring.com

```> What do those numbers mean?

The numbers are a common way of describing the movement of checkers.
The points around the board are assigned numbers from 24 to 1:

+24-23-22-21-20-19-+---+18-17-16-15-14-13-+
| X              O |   |    O           X |
| X              O |   |    O           X |
|                O |   |    O           X |
|                O |   |                X |
|                O |   |                X |
|                  |   |                  |64
|                  |   |                  |
|                X |   |                O |
|                X |   |                O |
|                X |   |    X           O |
| O              X |   |    X           O |
| O              X |   |    X           O |
+-1--2--3--4--5--6-+---+-7--8--9-10-11-12-+

This board is seen from X's perspective, and he is moving clockwise,
so his 2 checkers on the 24 point have the farthest to travel before
being able to bear off.

Let's look at an example from the original post:

62 - 24/18 13/11

The 62 represents the roll to be played; the other numbers represent
the movement of the checkers.  In this case, the poster is indicating
that the 6 will be played by moving a checker from the 24-point to the
18-point, and that the 2 will be played by moving a checker from the
13-point to the 11-point.  After the move, the board will look like
this:

+24-23-22-21-20-19-+---+18-17-16-15-14-13-+
| X              O |   | X  O           X |
|                O |   |    O           X |
|                O |   |    O           X |
|                O |   |                X |
|                O |   |                  |
|                  |   |                  |64
|                  |   |                  |
|                X |   |                O |
|                X |   |                O |
|                X |   |    X           O |
| O              X |   |    X           O |
| O              X |   |    X        X  O |
+-1--2--3--4--5--6-+---+-7--8--9-10-11-12-+

If a move results in a checker being hit, this is indicated by adding
a * to the end of that portion of the move.  For example, if O rolled
64 in the position above he might play:

64: 1/11*

Since it is not important whether the 6 or the 4 first was played
first, the intermediate step (1/7/11* or 1/5/11*) can be omitted.  If
X had left a blot on the 5-point which O also wanted to hit), the move
can be described as follows:

64: 1/5*/11*

Note that an asterisk immediately follows the point on which a checker
is hit.

Doubles are often shown by placing the number of checkers moved in
parens after the move.  For example, if O rolls 22, it could be noted
as either

19/21(2) 12/14(2) or
19/21 19/21 12/14 12/14

It's common to use the words "bar" or "off" to describe moves where
checkers are entered from the bar or taken off during bear off.  For
example:

bar/24 13/9 or
5/off 4/off

Finally, it's common (though not always observed--I didn't do it in
the examples above for the sake of simplicity) to reverse the
numbering of the points when O is on roll.  So the 24-point now
becomes O's 1-point, and the 7-point now becomes 0's 18-point.

Hope this helps.  If I left anything out, or something is unclear,
feel free to drop me an email.

Dean

("Chase" on FIBS and GamesGrid)
```

### Miscellaneous

Backgammon computers  (Graham Bayne+, Mar 2005)
Backgammon in famous paintings  (Dan Scoones, Mar 2000)
Backgammon versus poker  (Peter Hallberg, June 2006)
Backgammon's popularity  (Anon+, Sept 2003)
Board orientation  (Daniel Murphy, Mar 1999)
Calculation versus instinct  (Kit Woolsey, Jan 1998)
Checker play versus cube play  (Gregg Cattanach, Oct 2004)
Checker play versus cube play  (David Montgomery, Jan 1998)
Copying positions from books  (Stick+, Nov 2005)
Famous people who play  (Carem Wiklicm+, Dec 2002)
Free lesson  (Donald Kahn, Apr 1999)
General tips  (Hank Youngerman, Aug 1998)
Giants of Backgammon list  (Raccoon+, Mar 2006)
Handicapping  (Kees van den Doel+, Aug 2003)
Handicapping  (flash, Aug 1998)
Handicapping--Pass or pick a roll  (Michael J. Zehr, Dec 1997)
Handicapping--Rerolling 5-4  (Mary Hickey, Feb 2004)
How bots rate you  (Phil Simborg, Mar 2010)
Initiatives by local clubs  (Raccoon, Mar 2006)
Is online gambling legal in the U.S.?  (Chuck Bower+, June 2006)
Maximizing earnings  (Stanley E. Richards+, Oct 2005)
Money management  (Carly Robson+, Jan 2009)
Money management  (Gnoh Mon+, July 2004)
Money management  (Adam Stocks, Jan 2003)
Money management and the Kelly Criterion  (Stuart Thomson+, June 1999)
Notation  (Dean Gay, Feb 2000)
Notation  (Kit Woolsey, July 1995)
Position cards  (Francois Hochede, Jan 2004)
Posted diagrams are scrunched up  (Dale+, Sept 2000)
Top women players  (Tami+, Nov 2006)
Typesetting backgammon  (Jason Lee+, Apr 2006)
What is Zbot?  (Douglas Zare+, Dec 2003)
What is backgammon?  (David C. Oshel, Aug 1997)
Why do people play for money?  (Hank Youngerman+, Sept 2005)
World Champions  (John Bazigos, June 1994)
rec.games.backgammon mini-FAQ  (Daniel Murphy, Mar 1998)