LEADER BOARD

Player | Experience | ELO Rating | Annual Points Race |

Al Cantito | 933 | 1696.09 | 69.25 |

Jay Karns | 600 | 1533.47 | 50.25 |

Bill Porter | 327 | 1639.83 | 49.5 |

Jerry Shea | 519 | 1475.71 | 41.75 |

Jim Sisti | 812 | 1514.90 | 41 |

Andy Fazekas | 221 | 1588.27 | 25.5 |

Ray Nilson | 497 | 1497.49 | 23 |

Ed Corey | 726 | 1441.96 | 18 |

Gerhard Roland | 313 | 1501.58 | 17 |

Sandy Sisti | 773 | 1338.67 | 17 |

Tom Meyer | 758 | 1689.47 | 10.25 |

Al Theriault | 163 | 1508.54 | 9 |

Adrian Costa | 194 | 1432.36 | 5 |

Sarah Saltus | 81 | 1478.83 | 4 |

Mike Pollack | 72 | 1444.87 | 2 |

Frank Vaccarino | 59 | 1424.88 | 2 |

Scott Hahn | 62 | 1429.23 | 1 |

Updated 3/16/18

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.

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.