LEADER BOARD

ELO | Annual | ||

Player | Exp | Rating | Points Race |

Tom Meyer | 166 | 1543.83 | 50 |

Jay Karns | 139 | 1532.35 | 37.5 |

Al Cantito | 167 | 1546.19 | 36.5 |

Jim Sisti | 175 | 1471.27 | 29 |

Sandy Sisti | 159 | 1464.36 | 26.5 |

Gerhard Roland | 46 | 1518.95 | 17 |

Ed Corey | 122 | 1453.85 | 16.75 |

Ray Nelson | 57 | 1496.19 | 15 |

Al Theriault | 60 | 1511.83 | 14 |

Mark Denihan | 17 | 1528.48 | 11 |

Ross Gordon | 15 | 1526.77 | 10 |

Jim Stutz | 21 | 1511.00 | 6 |

Adrian Costa | 20 | 1518.28 | 4.75 |

Andy Fazekas | 30 | 1500.55 | 4.75 |

Bill Porter | 35 | 1494.21 | 3 |

Dan Whitney | 20 | 1502.49 | 2 |

Mike Pollack | 30 | 1485.59 | 2 |

Rob Roy | 23 | 1477.80 | 1 |

Dave Mirto | 21 | 1475.13 | 1 |

Frank V | 37 | 1457.21 | 1 |

Terri White | 10 | 1483.68 | 0 |

Updated 5/26/17

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.