LEADER BOARD

Player Experience ELO Rating 2019 Points Race
Al Cantito 1977 1671.29 183.25
Jim Sisti 1928 1569.66 166.75
Sandy Sisti 1670 1373.98 115.75
Jerry Shea 1422 1554.12 115.25
Ed Corey 1498 1452.03 112
Jay Karns 1095 1607.59 90.5
Andy Fazekas 884 1475.94 75.5
Bill Porter 713 1601.19 57.75
Ray Nilson 920 1428.28 46.5
Frank DiMaggio 132 1566.75 35.5
Adrian Costa 499 1417.69 35.5
Al Theriault 355 1495.97 30.5
Frank Vaccarino 313 1396.02 16.5
Marty Storer 45 1539.53 12
Derek Meredith 21 1507.29 7.5
Jim Stutz 236 1545.09 7
Tom Meyer 792 1683.22 3
Dave Mirto 171 1420.91 3
Sarah Saltus 187 1406.72 2
Chris Knapp 61 1535.84 1
Rich Batt 67 1459.28 1
Patty Knapp 32 1455.07 1
Mike Pollack 127 1423.95 1
       

Updated 11/1/19

 

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.