### Final Results (as of Mar 5, 2020)

Team | # of Matches Played | Average Points/Match | Jan 18, 2020 | Feb 1, 2018 | Feb 8, 2020 | Feb 22, 2020 | Feb 29, 2020 |

SPOR | 4 | 68 | 67 | 57 | 79 | 68 | DNP |

MISC | 3 | 66 | DNP | 70 | DNP | 64 | 65 |

TCWO | 3 | 62 | 66 | DNP | 52 | DNP | 67 |

*** DNP = Did Not Play**

### Final Player Ratings (as of Mar 5, 2020)

How are Player Ratings calculated?

Player | Team | Singles Matches Played | Doubles Matches Played | Rating | |||

Singles | Doubles | ||||||

Current | Average | Current | Average | ||||

Othman Ennaciri | MISC | 3 | 3 | 548 | 549 |
547 | 551 |

Fadi Sallit | SPOR | 4 | 4 | 551 | 542 |
524 | 525 |

Steve Wechsler | SPOR | 4 | 4 | 529 | 526 |
524 | 524 |

Andrew Rowe | SPOR | 4 | 4 | 519 | 522 |
522 | 526 |

Kevin McIlvenna | TCWO | 4 | 3 | 514 | 516 |
523 | 521 |

Arun Tosing | MISC | 2 | 1 | 519 | 513 |
||

Jeff Henkelman | TCWO | 3 | 3 | 504 | 501 |
509 | 505 |

Andreas Weigel | TCWO | 3 | 2 | 470 | 471 |
475 | 476 |

Ronan Boyd | MISC | 5 | 4 | 473 | 468 |
475 | 470 |

Karim Belkhir | MISC | 4 | 3 | 466 | 467 |
475 | 472 |

Stevan Szonjic | TCWO | 3 | 3 | 463 | 466 |
465 | 465 |

Eric Khaiat | SPOR | 3 | 3 | 439 | 443 |
434 | 441 |

### January 18, 2020

TCWO | SPOR | TB #1 | TB #2 | TB #3 | Retire? | Comments | League Pts | ||||||

Singles 1 v 1 | Kevin McIlvenna | Fadi Sallit | 5 | 13 | 11 | 13 | 9 | 13 | 7 | 15 | |||

Singles 2 v 2 | Jeff Henkelman | Steve Wechsler | 10 | 13 | 13 | 10 | 10 | 13 | 11 | 13 | |||

Singles 3 v 3 | Andreas Weigel | Eric Khaiat | 13 | 6 | 13 | 10 | 13 | 11 | 15 | 8 | |||

Singles 4 v 4 | Stevan Szonjic | Andrew Rowe | 10 | 13 | 5 | 13 | 13 | 11 | 9 | 13 | |||

Doubles 1&2 v 1&2 | Kevin McIlvenna | Fadi Sallit | 17 | 6 | 12 | 17 | 14 | 17 | 11 | 11 | |||

Jeff Henkelman | Steve Wechsler | ||||||||||||

Doubles 3&4 v 3&4 | Andreas Weigel | Eric Khaiat | 15 | 17 | 17 | 6 | 17 | 5 | 13 | 7 | |||

Stevan Szonjic | Andrew Rowe | ||||||||||||

League Total Points | 66 | 67 |

### Feb 1, 2020

SPOR | MISC | TB #1 | TB #2 | TB #3 | Retire? | Comment | League Pts | ||||||

Singles 1 v 1 | Andrew Rowe | Othman Ennaciri | 9 | 13 | 6 | 13 | 9 | 13 | 8 | 15 | |||

Singles 2 v 2 | Fadi Sallit | Arun Tosing | 13 | 4 | 13 | 4 | 13 | 12 | Arun subbing for Ahmed | 15 | 6 | ||

Singles 3 v 3 | Steve Wechsler | Ronan Boyd | 10 | 13 | 13 | 2 | 13 | 4 | 13 | 6 | |||

Singles 4 v 4 | Eric Khaiat | Karim Belkhir | 5 | 13 | 3 | 13 | 7 | 13 | 4 | 15 | |||

Doubles 1&2 v 1&2 | Andrew Rowe | Othman Ennaciri | 6 | 17 | 13 | 17 | 11 | 17 | 6 | 15 | |||

Fadi Sallit | Arun Tosing | ||||||||||||

Doubles 3&4 v 3&4 | Steve Wechsler | Ronan Boyd | 15 | 17 | 17 | 12 | 13 | 17 | 11 | 13 | |||

Eric Khaiat | Karim Belkhir | ||||||||||||

League Total Points | 57 | 70 |

### Feb 8, 2020

SPOR | TCWO | TB #1 | TB #2 | TB #3 | Retire? | Comment | League Pts | ||||||

Singles 1 v 1 | Steve Wechsler | Sean James | 13 | 8 | 4 | 13 | 13 | 4 | 11 | 8 | |||

Singles 2 v 2 | Andrew Rowe | Kevin McIlvenna | 5 | 13 | 12 | 13 | 13 | 10 | 10 | 13 | |||

Singles 3 v 3 | Fadi Sallit | Jeff Henkelman | 13 | 0 | 13 | 4 | 13 | 7 | 15 | 3 | |||

Singles 4 v 4 | Ronan Boyd | Stevan Szonjic | 13 | 8 | 11 | 13 | 13 | 12 | 13 | 11 | |||

Doubles 1&2 v 1&2 | Steve Wechsler | Sean James | 17 | 12 | 17 | 12 | 17 | 11 | 15 | 8 | |||

Andrew Rowe | Kevin McIlvenna | ||||||||||||

Doubles 3&4 v 3&4 | Fadi Sallit | Jeff Henkelman | 17 | 11 | 17 | 16 | 17 | 12 | 15 | 9 | |||

Ronan Boyd | Stevan Szonjic | ||||||||||||

League Total Points | 79 | 52 |

### Feb 15, 2020

TCWO | MISC | TB #1 | TB #2 | TB #3 | Retire? | Comment | League Pts | ||||||

Singles 1 v 1 | Kevin McIlvenna | Arun Tosing | 7 | 13 | 10 | 13 | 10 | 13 | 8 | 15 | |||

Singles 2 v 2 | Andreas Weigel | Ronan Boyd | 9 | 13 | 8 | 13 | 10 | 13 | 8 | 15 | |||

Singles 3 v 3 | Jean-Paul Pham | Karim Belkhir | 13 | 11 | 13 | 8 | 13 | 4 | 15 | 6 | |||

Singles 4 v 4 | 0 | 0 | |||||||||||

Doubles 1&2 v 1&2 | 0 | 0 | |||||||||||

Doubles 3&4 v 3&4 | 0 | 0 | |||||||||||

League Total Points | 31 | 36 |

**Note: only singles matches were played on Feb 15, 2020. No doubles.**

### February 22, 2020

MISC | SPOR | TB #1 | TB #2 | TB #3 | Retire? | Comment | League Pts | ||||||

Singles 1 v 1 | Othman Ennaciri | Fadi Sallit | 3 | 13 | 10 | 13 | 13 | 11 | 9 | 13 | |||

Singles 2 v 2 | Andrew Clark | Steve Wechsler | 9 | 13 | 5 | 13 | 3 | 13 | 5 | 15 | |||

Singles 3 v 3 | Karim Belkhir | Andrew Rowe | 12 | 13 | 6 | 13 | 3 | 13 | 7 | 15 | |||

Singles 4 v 4 | Ronan Boyd | Eric Khaiat | 13 | 12 | 13 | 6 | 13 | 5 | 15 | 7 | |||

Doubles 1&2 v 1&2 | Othman Ennaciri | Fadi Sallit | 17 | 13 | 17 | 7 | 17 | 12 | 15 | 7 | |||

Andrew Clark | Steve Wechsler | ||||||||||||

Doubles 3&4 v 3&4 | Karim Belkhir | Andrew Rowe | 14 | 17 | 17 | 12 | 17 | 13 | 13 | 11 | |||

Ronan Boyd | Eric Khaiat | ||||||||||||

League Total Points | 64 | 68 |

### February 29, 2020

MISC | TCWO | TB #1 | TB #2 | TB #3 | Retire? | Comment | League Pts | ||||||

Singles 1 v 1 | Othman Ennaciri | Kevin McIlvenna | 13 | 9 | 13 | 8 | 13 | 6 | 15 | 7 | |||

Singles 2 v 2 | Ahmed Aref | Jeff Henkelman | 1 | 13 | 4 | 13 | 9 | 13 | 4 | 15 | |||

Singles 3 v 3 | Karim Belkhir | Andreas Weigel | 13 | 8 | 5 | 13 | 11 | 13 | 9 | 12 | |||

Singles 4 v 4 | Ronan Boyd | Stevan Szonjic | 13 | 7 | 12 | 13 | 13 | 9 | 14 | 10 | |||

Doubles 1&2 v 1&2 | Othman Ennaciri | Kevin McIlvenna | 11 | 17 | 15 | 17 | 17 | 11 | 10 | 12 | |||

Ahmed Aref | Jeff Henkelman | ||||||||||||

Doubles 3&4 v 3&4 | Karim Belkhir | Andreas Weigel | 14 | 17 | 17 | 13 | 17 | 15 | 13 | 11 | |||

Ronan Boyd | Stevan Szonjic | ||||||||||||

League Total Points | 65 | 67 |

### How are Player Ratings calculated?

The rating system is based on a logarithmic scale, with a 50 point rating difference equivalent to a factor of 2 difference in points expected to be won. If player “A” has a rating of 300, and player “B” has a rating of 250, the difference of 50 indicates that player “A” is expected to win 2 points for every 1 point won by player “B”. The logarithmic scale means that a rating difference of 100 points is equivalent to a factor of 4 difference in point ratio.

### How Rating Changes are Calculated

After a match, the rating change for each match is calculated by the computer (spreadsheet). For each match, the ratio of points won by the each player is used to calculate the corresponding rating difference for that match. This rating difference is compared with the actual rating difference between the players. The difference in these rating is multiplied by 15% (an empirical fudge factor) to arrive at the assigned rating change (a maximum rating change of 10 is allowed in a match to avoid wild swings in ratings, and for players with a rating difference greater than 50, an adjustment is made as described below). The rating of the player who won more points than expected goes up, and the other player’s rating goes down (rating is conserved).

If the rating difference between players is greater than 50, the following adjustment is made to the calculated rating change: a) if the rating difference is 100 or greater, no rating change is allowed; b) if the rating difference is between 51 and 99, the calculated rating change is adjusted by the factor ((100 – rating difference) / 50). This adjustment is applied to avoid large rating changes when players of significantly different ability play each other.

For example, consider 2 players with a rating difference of 50. They play a tiebreak to 16 points. If the higher rated player wins 16-4 the rating changes are calculated as follows:

- In the game the higher rated player won 16 points, and the lower rated player won 4 points. The point ratio is therefore 4:1. This point ratio translates to a game rating difference of 100 points in the logarithmic rating scale (see “What the Rating Mean”, above).
- The rating change = 0.15 * (100 (game rating difference) – 50 (rating difference between players)) = 0.15 * 50 = 7.5.
- The winning players rating goes up 7.5, and the losing players rating goes down by 7.5.

### History of the Rating System

Bob Donders developed this rating system in the 1990’s for use at the Deep River squash club, and it was used it for over a decade for a group of 20-30 players that played each week in an informal round-robin. The players were split into 3 groups (A, B, C) according to their ratings. For each match the rating systems was used to adjust the starting scores so that the outcomes were always close. For example, if Player A was rated 50 points higher than Player B (so Player A is expected to win twice as many points as Player B), and the game is played to 15 points, then the starting score would be -5 to +5. Player A would need to win 20 points to win the game, which is twice as many as Player B (who would only need to win 10 points). The system worked out really well.