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 | 1567 | 1687.62 | 61.5 |

Andy Fazekas | 667 | 1534.85 | 44.5 |

Ed Corey | 1093 | 1447.82 | 37.75 |

Ray Nilson | 841 | 1464.77 | 35 |

Jim Sisti | 1464 | 1533.57 | 34.75 |

Jerry Shea | 1037 | 1527.04 | 34 |

Sandy Sisti | 1287 | 1353.24 | 33.5 |

Jay Karns | 904 | 1566.98 | 30 |

Derek Meredith | 21 | 1507.29 | 7.5 |

Frank DiMaggio | 24 | 1516.94 | 6 |

Adrian Costa | 362 | 1410.00 | 6 |

Al Theriault | 257 | 1483.51 | 3 |

Bill Porter | 470 | 1618.63 | 2 |

Jim Stutz | 188 | 1550.02 | 1 |

Updated 3/15/19

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.