LEADER BOARD

    ELO Annual
Player Exp Rating Points Race
Tom Meyer 269 1604.52 95.5
Al Cantito 274 1573.87 71
Jay Karns 248 1527.86 56.5
Jim Sisti 261 1467.76 38.75
Sandy Sisti 261 1446.96 35.75
Ed Corey 219 1450.80 33.25
Bill Porter 151 1568.64 27.5
Gerhard Roland 116 1505.78 26
Al Theriault 101 1521.73 17
Ray Nelson 91 1479.34 17
Andy Fazekas 90 1510.98 13.25
Mark Denihan 17 1528.48 11
Ross Gordon 15 1526.77 10
Adrian Costa 74 1490.40 6.75
Jim Stutz 21 1511.00 6
Rob Roy 55 1479.45 3
Mike Pollack 53 1474.61 3
Mike Agranoff 25 1511.29 2
Dan Whitney 20 1502.49 2
Terri White 51 1484.48 2
Dave Mirto 56 1454.86 2
Scott Hahn 19 1497.93 1
Steve Nahas 19 1493.57 1
Dick Clukey 23 1492.00 1
Rich Batt 31 1477.24 1
Jerry Shea 35 1476.50 1
Frank V 37 1457.21 1
Jessica 12 1483.47 0

Updated 6/23/17

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

 

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.