Rating System

Why Have A Rating System?

The VBV rating system provides an objective assessment of player ability based on past performance in VBV tournaments. The ratings are used as a guideline to place players of comparable abilities within the same division for each tournament. This helps ensure competitive play and an enjoyable tournament for players in all divisions. Dependent upon the turnout for a particular tournament, we reserve the right to move a player to a higher or lower division to complete the field for one or more divisions.

Formula for VBV Ratings Starting in the 2010 Season

For the 2010 season, VBV is modifying its criteria for determining which scores to include in the ratings calculation. Previously, we included the 10 most recent events, regardless of whether a player participated in them or not. Now, we will include the 6 most recent round robin doubles events, in the last 24 months, that a player played in. Any scores more than 24 months old will be omitted. Team events, such as Sixes, Fours, and fixed partner doubles will also be omitted.

The VBV Rally Scoring Ratings Formula

The VBV ratings formula is based on a weighted combination of 75% points won and 25% games won. The best way to describe this formula is with an example: Assume a player plays 6 rally scoring games to 21, wins 4 games and scores 105 of the possible 126 points. This player therefore wins 67% (4 out of 6) of games played and 83% (105 out of 126) of the possible points. The unadjusted rating for this player will be: (75)x(0.83) + (25)x(0.67) = 79.2

As with the previous ratings formula, if you are undefeated in your pool – winning 100% of games played (and 100% of possible points) – your unadjusted rating will be 100.

The unadjusted score above will then be adjusted by a weighting factor for each division. The weightings are listed below and applied to the sample calculation above:

Division Weight Factor Example
Division 1 1.0 79.2 x 1.0 = 79.2 Rating
Division 2 0.8 79.2 x 0.8 = 63.3 Rating
Division 3 0.6 79.2 x 0.6 = 47.5 Rating
Division 4 0.4 79.2 x 0.4 = 31.7 Rating

Bonus points are awarded for the playoffs for each division. If you earn a playoff spot and play in the playoffs, you will get bonus points added to your final adjusted rating for that tournament. First place receives 5 points, second place receives 3 point, and everyone else receives 1 point.

Division Weight Factor Example
Division 1 1.0 79.2 x 1.0 = 79.2 Rating
Division 2 0.8 79.2 x 0.8 = 63.3 Rating
Division 3 0.6 79.2 x 0.6 = 47.5 Rating
Division 4 0.4 79.2 x 0.4 = 31.7 Rating

A player’s final rating is then determined by the average rating over the last 6 VBV round robin doubles events, in the last 24 months, in which the player participated. This averaging helps minimize the impact of a “bad day” on the player’s rating, but will also allow the player to advance to a higher division with consistently high scores.