Match Equities

Forum Archive : Match Equities

Which match equity table is best?

From:   Ian Shaw
Date:   7 December 2001
Subject:   Re: Match equity tables
Google:   AW0Q7.1444$Jm.76789@stones

I use the Woolsey-Heinrich MET, because I can remember it! Well, almost. I
learnt the 1-away & 2-away values, and use Neil's Numbers for the rest.

The most scientific comparison I know of is by Kit Woolsey. GammOnLine
subscribers can check out this discussion by Kit Woolsey. 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."


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

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 11-a, 11-a, except you should at 2% to the
results for 2-a 5-a to 2-a 8-a.  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.

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Match Equities

Constructing a match equity table  (Walter Trice, Apr 2000) 
Does it matter which match equity table you use?  (Klaus Evers+, Nov 2005)  [GammOnLine forum]
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)  [GammOnLine forum] [Long message]
ME Table: Big Brother  (Peter Fankhauser, July 1996) 
ME Table: Dunstan  (Ian Dunstan+, Aug 2004)  [GammOnLine forum]
ME Table: Escoffery  (David Escoffery, Nov 1991) 
ME Table: Friedman  (Elliott C Winslow, Oct 1991) 
ME Table: Kazaross  (Neil Kazaross, Dec 2003)  [GammOnLine forum]
ME Table: Kazaross-XG2  (neilkaz, Aug 2011) 
ME Table: Rockwell-Kazaross  (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)  [GammOnLine forum]
ME Table: Zorba  (Robert-Jan Veldhuizen+, Dec 2003) 
ME at 1-away/2-away (crawford)  (Fabrice Liardet+, Nov 2007)  [GammOnLine forum]
ME at 1-away/2-away (crawford)  (Ian Shaw+, Apr 2003)  [GammOnLine forum]
Match equities--an 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)  [GammOnLine forum]
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)  [GammOnLine forum]
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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