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 | Annual Points Race |

Al Cantito | 759 | 1706.61 | 20.5 |

Bill Porter | 255 | 1595.38 | 16 |

Jerry Shea | 387 | 1474.19 | 14.75 |

Tom Meyer | 746 | 1702.37 | 9.25 |

Andy Fazekas | 172 | 1553.34 | 4 |

Sarah Saltus | 69 | 1496.45 | 3 |

Ed Corey | 621 | 1446.09 | 3 |

Sandy Sisti | 647 | 1376.96 | 3 |

Gerhard Roland | 273 | 1498.49 | 2 |

Jim Sisti | 651 | 1495.96 | 1 |

Adrian Costa | 158 | 1441.59 | 1 |

Updated 1/19/18

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. 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.