LEADER BOARD

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.

Player | Experience | ELO Rating | 2019 Points Race |

Al Cantito | 1482 | 1689.10 | 36.5 |

Ray Nilson | 776 | 1486.85 | 28 |

Jim Sisti | 1392 | 1547.61 | 23.75 |

Andy Fazekas | 575 | 1512.33 | 23 |

Sandy Sisti | 1223 | 1360.70 | 22.5 |

Ed Corey | 1014 | 1437.20 | 18.75 |

Jerry Shea | 980 | 1520.75 | 17 |

Derek Meredith | 21 | 1507.29 | 7.5 |

Frank DiMaggio | 24 | 1516.94 | 6 |

Adrian Costa | 338 | 1405.14 | 3 |

Al Theriault | 245 | 1496.30 | 2 |

Bill Porter | 458 | 1629.57 | 1 |

Jim Stutz | 188 | 1550.02 | 1 |

Jay Karns | 826 | 1545.26 | 1 |

Updated 2/8/19

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 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.