LEADER BOARD

ELO | Annual | ||

Player | Exp | Rating | Points Race |

Tom Meyer | 269 | 1604.52 | 95.5 |

Al Cantito | 274 | 1573.87 | 71 |

Jay Karns | 248 | 1527.86 | 56.5 |

Jim Sisti | 261 | 1467.76 | 38.75 |

Sandy Sisti | 261 | 1446.96 | 35.75 |

Ed Corey | 219 | 1450.80 | 33.25 |

Bill Porter | 151 | 1568.64 | 27.5 |

Gerhard Roland | 116 | 1505.78 | 26 |

Al Theriault | 101 | 1521.73 | 17 |

Ray Nelson | 91 | 1479.34 | 17 |

Andy Fazekas | 90 | 1510.98 | 13.25 |

Mark Denihan | 17 | 1528.48 | 11 |

Ross Gordon | 15 | 1526.77 | 10 |

Adrian Costa | 74 | 1490.40 | 6.75 |

Jim Stutz | 21 | 1511.00 | 6 |

Rob Roy | 55 | 1479.45 | 3 |

Mike Pollack | 53 | 1474.61 | 3 |

Mike Agranoff | 25 | 1511.29 | 2 |

Dan Whitney | 20 | 1502.49 | 2 |

Terri White | 51 | 1484.48 | 2 |

Dave Mirto | 56 | 1454.86 | 2 |

Scott Hahn | 19 | 1497.93 | 1 |

Steve Nahas | 19 | 1493.57 | 1 |

Dick Clukey | 23 | 1492.00 | 1 |

Rich Batt | 31 | 1477.24 | 1 |

Jerry Shea | 35 | 1476.50 | 1 |

Frank V | 37 | 1457.21 | 1 |

Jessica | 12 | 1483.47 | 0 |

Updated 6/23/17

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.