LEADER BOARD

Player Experience ELO Rating Annual Points Race
Al Cantito 1003 1721.88 107.75
Jerry Shea 564 1478.62 60.75
Jay Karns 629 1525.30 54.25
Jim Sisti 865 1499.80 52
Bill Porter 327 1639.83 50.5
Ray Nilson 549 1499.78 40.5
Andy Fazekas 278 1573.98 38.5
Sandy Sisti 829 1355.84 36.5
Ed Corey 743 1436.72 21
Gerhard Roland 313 1501.58 17
Tom Meyer 758 1689.47 10.25
Al Theriault 163 1508.54 10
Adrian Costa 216 1434.36 8
Frank Vaccarino 90 1406.94 6
Sarah Saltus 81 1478.83 4
Garrett Duquene 45 1492.41 3
Rich Batt 55 1473.06 3
Mike Pollack 72 1444.87 2
Scott Hahn 62 1429.23 1
Dave Mirto 116 1418.15 2
       

Updated 4/20/18

Annual Points Race Accrual Methodology

 

For each tournament event, Points are awarded to players as follows:

 

1.  A player receives 1 Point for each match they win and for every meetup they attend.

 

2.  Bonus Points are established based on the number of event participants and distributed thus:

 

A.  1st Place receives an amount equal to the total number of participants

 

B.  2nd Place receives an amount equal to one-half the total number of participants

 

C.  3rd Place (Optional) receives an amount equal to one-quarter the total number of participants

 

All tournament event points awarded to a player are added to their annual cumulative total.

 

 

FIBS Rating Formula*

 

These are the formulas used to determine the ratings of a player:

 

Let's say that two players P1 and P2 were playing a n-point match. The ratings of the players are r1 for P1 and r2 for P2 .

 

Let D = abs(r1-r2) (rating difference)

Let P_upset = 1/(10^(D*sqrt(n)/2000)+1) (probability that underdog wins).

Let P=1-P_upset if the underdog wins and P=P_upset if the favorite wins.

 

For the winner:

Let K = max ( 1 , -experience/400+2 )

The rating change is: 4*K*sqrt(n)*P

 

For the loser:

Let K = max ( 1 , -experience/400+2 )

The rating change is: -4*K*sqrt(n)*P

 

The 'experience' of a player is the sum of the lengths of all matches a player has finished. Every player starts with a rating of 1500 and an experience of 0.

 

*Thanks to FIBS (First Internet Backgammon Server) for providing the rating formula as part of their HELP menu.