LEADER BOARD

Player Experience ELO Rating 2020 Points Race
Al Cantito 2118 1689.04 51.75
Ray Nilson 1061 1445.68 38
Bill Porter 788 1612.72 26.25
Ed Corey 1608 1439.64 26
Jim Sisti 2077 1538.15 23.5
Sandy Sisti 1790 1358.56 20.25
Jerry Shea 1498 1538.26 16
Frank Vaccarino 391 1393.14 16
Adrian Costa 547 1442.39 12.25
Frank DiMaggio 181 1587.53 7.5
Al Theriault 404 1502.55 4
Jay Karns 1112 1607.72 3
Joe Etter 14 1503.32 2
Andy Fazekas 915 1473.59 2
Ray Moran 8 1484.95 1
       

Updated 2/21/20

 

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.  Tournament Points are additional points available based on the number of event participants. The number of positions (First Place, Second, Place and Third Place) eligible to receive Tournament Points for each event is at the sole discretion of the tournament director depending on the size of the field, the type of competition format, and other contributing factors and will be announced before play starts.  Tournament Points will be distributed as follows:

 

A.  First Place - Receives an amount equal to the total number of participants

 

B.  Second Place (Optional) - Receives an amount equal to one-half the total number of participants

 

C.  Third 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.