LEADER BOARD

    ELO Annual
Player Experience Rating Points Race
Tom Meyer 341 1620.64 112.75
Al Cantito 305 1587.12 86
Jay Karns 248 1534.32 56.5
Jim Sisti 304 1461.76 47.25
Sandy Sisti 319 1448.40 41.75
Ed Corey 248 1478.73 41
Gerhard Roland 152 1514.65 40
Ray Nelson 162 1503.95 31.75
Bill Porter 151 1562.57 27.5
Al Theriault 101 1520.20 17
Jerry Shea 97 1492.94 16
Andy Fazekas 90 1506.15 13.25
Mark Denihan 17 1528.48 11
Ross Gordon 15 1526.77 10
Adrian Costa 74 1482.16 6.75
Jim Stutz 21 1510.35 6
Dave Mirto 87 1425.62 5
Terri White 68 1469.55 4
Rob Roy 55 1478.12 3
Mike Pollack 53 1471.38 3
Jessica Madeux 46 1460.35 3
Mike Agranoff 25 1510.28 2
Dan Whitney 20 1499.93 2
Scott Hahn 43 1456.63 2
Steve Nahas 19 1490.88 1
Dick Clukey 23 1489.22 1
Rich Batt 31 1472.32 1
Frank V 37 1455.54 1

Updated 7/14/17

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.