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Match Equities
Which match equity table is best?

I use the WoolseyHeinrich MET, because I can remember it! Well, almost. I
learnt the 1away & 2away values, and use Neil's Numbers for the rest.
http://www.gammonline.com/demo/equity.htm
The most scientific comparison I know of is by Kit Woolsey. GammOnLine
subscribers can check out this discussion by Kit Woolsey.
http://www.gammonline.com/members/Jan01/articles/sneq.htm. Kit writes,
"Snowie assumes a gammon rate of 26%, while for my table I assumed a gammon
rate of about 21%. I agree that Snowie's gammon rate is more accurate in
theory. In practice most backgammon players (even experts) do not play
aggressively enough for a gammon, since they are more concerned about
winning the game. Thus the empirical gammon rate is considerably lower than
Snowie's theoretical rate."
Ian


Gregg Cattanach writes:
I use the Woolsey table because 1) I believe the gammon rate assumtions are
more valid, and 2) there are several very simple algorithms to compute all
of the ME values in your head. I don't know any method to create Snowie's
numbers with some simple algorithm, and it isn't practical to use Snowie's
numbers which are expressed in 10ths of percentages. Only a trivial number
of people could effectively do 3 digit precision math for ME calculations
in their head. Snowie's tables generally only differ from Woolsey's by
1.5% or less. Granted this can have an effect on a close decision, but
over the board that precision isn't really required.
Btw, my favorite method of coming up with the Woolsey numbers is the Turner
method:
50 + (24/T + 3) * D where T is the number of points the trailer has to go
and D is the differences in scores. This gets to within 1% of the Woolsey
number for all scores up to 11a, 11a, except you should at 2% to the
results for 2a 5a to 2a 8a. Also, you just need to memorize the
Crawford score sequence: 30,25,17,15,10,9,6,5,3,3,2,2,1,1 as the formula
doesn't work for those scores.
Gregg




Match Equities
 Constructing a match equity table (Walter Trice, Apr 2000)
 Does it matter which match equity table you use? (Klaus Evers+, Nov 2005)
 Does it matter which match equity table you use? (Achim Mueller+, Dec 2003)
 Does it matter which match equity table you use? (Chuck Bower+, Sept 2001)
 ME Table: Big Brother (Peter Fankhauser, July 1996)
 ME Table: Dunstan (Ian Dunstan+, Aug 2004)
 ME Table: Escoffery (David Escoffery, Nov 1991)
 ME Table: Friedman (Elliott C Winslow, Oct 1991)
 ME Table: Kazaross (Neil Kazaross, Dec 2003)
 ME Table: KazarossXG2 (neilkaz, Aug 2011)
 ME Table: RockwellKazaross (Chuck Bower+, June 2010)
 ME Table: Snowie (Chase, Apr 2002)
 ME Table: Snowie (Harald Retter, Aug 1998)
 ME Table: Woolsey (Raccoon, Apr 2006)
 ME Table: Woolsey (Kit Woolsey, May 1994)
 ME Table: Woolsey (William R. Tallmadge, Jan 1994)
 ME Table: Zadeh (Jørn Thyssen, Mar 2004)
 ME Table: Zorba (RobertJan Veldhuizen+, Dec 2003)
 ME at 1away/2away (crawford) (Fabrice Liardet+, Nov 2007)
 ME at 1away/2away (crawford) (Ian Shaw+, Apr 2003)
 Match equitiesan alternate view (Durf Freund, Oct 1994)
 Neil's new numbers (neilkaz, Aug 2011)
 Neil's numbers (Kit Woolsey+, Oct 1994)
 On calculating match equity tables (Neil Kazaross, July 2004)
 Turner formula (Gregg Cattanach, Feb 2003)
 Turner formula (Stephen Turner, June 1994)
 Using a match equity table (Michael J. Zehr, June 1992)
 Value of free drop (Neil Kazaross, Oct 2002)
 Which match equity table is best? (Martin Krainer+, Oct 2003)
 Which match equity table is best? (Ian Shaw+, Dec 2001)
 Why use a match equity table? (Kit Woolsey, Feb 1999)
 Worth memorizing? (Alef Rosenbaum+, Feb 2003)
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