CRA explained

How do you assign a CRA?

  • On Day 1, the coach had no idea what those numbers would turn out to be in 2020, but he knew the players who had to play and he knew which court they had to play on. He respected the rule with the existing CRAs.
  • We therefore rely on his judgment to say that the players were on the right court. Tenniscores will assign the appropriate CRA to each player in their first match.
  • By setting foot on a tennis court to play a TFIM match on September 15 or 16, 2016, the player received a CRA depending on her level and the court on which she was. Ex: the level 4 player who played on the first court had a CRA of 2.25.
  • Here are the CRAs and totals for all level 4 teams' line-ups on September 15, 2016.
    • court # 1: 2.25 + 2.25 = 4.50
    • court # 2: 2.00 + 2.00 = 4.00
    • court # 3: 1.75 +1.75 = 3.50
    • It goes without saying that the equal sum on each individual court gives a chance of winning this first match at 50% for both teams.
  • Upon stepping onto a tennis court to play their first TFIM match in 2016, all players had a CRA other than 0.00, assigned by Tenniscores.

  1. To start a new season, we start with the notion that the new player has at least the same “chance to win” that another new player had the year before.
  2. It is September 15, 2016 and at the end of the match, the players who have played will have new CRAs depending on the victory and the result of this victory.
  3. The following week, another roster with new players added, the odds of winning don't vary too much. It takes about 8 matches to stabilize a starting player’s CRA. Remember, “we were all seen as rookies” in 2016.
  4. All those who have played have a CRA other than 0.00.
  5. And so on for the entire 2016-17 season.
  6. The CRA of those who have played a lot of matches will be more accurate. The CRA for those who have an average above 50% will be higher than for those who have lost several times.
  7. With a first season over, we can see which players have the “potential to win”.
    • Notice the potential word that has taken the place of chance. The interpretation of the CRA changes, there are some who have a CRA at the bottom of the threshold for the level, ie lower than the 1.75 granted to the player who starts on court 3 of level 4. These players have a low average and do not often win. We say their potential to win is not high.
  8. We are starting the 2017-18 season with the final 2016-17 CRAs.
    1. Already, it is different from the CRAs we are used to; TFIM adjusted, at the start of the season, the CRAs of players who were below average. We increased their CRAs which overestimated their potential. We said that changing teams was a reason for adjustment, we said that the CRA was a position in a team ... We now know that all these unnecessary adjustments distorted reality and noticed that the CRA at the end of the season very often came back at the same number as before the adjustment at the start of the season. The same players were given a minimum CRA. It was necessary to have a minimum for the player who lost because by losing, the CRA could go down in the negative for level 4 players. With the TRS, we can have a CRA that remains below the threshold, but remains positive.
    2. Some players find it unfair that the new player joining the team has a higher CRA than the player who has been playing for years. SEE # 1, the new player has the same "chance to win" the players had in 2016. Why? We do not know her potential while the other player has already demonstrated her potential. If the coach tells us "she's a # 2 court player" she starts off with a CRA of 2.00 at level 4. It is the role of the coach to assign the CRA. TFIM tells the coach, she will have a CRA of 2.00 if you put her on the 2nd court.
  9. During the year 2018-19 followed by the year 2019-20, several matches were played always respecting the CRA rule. There were winners and losers. The CRA becomes the one that each player deserves by having played in a level, on a court with a partner in doubles against opponents.
    1. The CRA of the player who wins a lot will be among the highest, she has a better potential to win and vice versa that of the one who loses often will be lower than average.
    2. The CRA no longer has a threshold per level, although we have specific figures for each beginner.
    3. The player who changes levels has a CRA normally higher than the average of her old level, but not necessarily equal to that of her new team. The CRA will adjust with the levels of play of the opponents and the result of their matches.

They say the system is dynamic, it doesn't stop! Remember that the first CRA was 0.00 and putting something other than what Tenniscores gave would change all CRAs for all players who have played with or against this person. If we change a data of a match two weeks later, it can change the CRAs of all those affected by this data followed by the matches of the following week which could be affected, etc ... Therefore we cannot allow a change to be made unless it is done early and before a captain checks her lineup for the following week.


Interesting facts:
The CRA is based primarily on winning. Victory can be tight, easy, or difficult. In principle if the sum of the CRAs is much higher than that of the opponents, one would expect them to win easily and if not, they would not be rewarded. We overestimated them and their CRA will go down. EX: You don't reward a 6-0, 6-0 if you are expected to win 6-0, 6-0. Your CRA is already high enough.
The opposite is also true, if you are expected to lose and win, you have been underestimated and your CRA will go up.
And the beauty of this system, if you are expected to lose, lose, but the game is close, your performance will exceed expectations, you will be rewarded.

  pdf print version in French

CRA committee report

For more on the CRA read the "Rapport du comité CRA" tabled on December 1, 2014 (in French only)

CRA vs MNP

CRA (rule 2.2.6) & MNP (rule 1.8).

The CRA (calculation for the respect of the alignment) and MNP (My Number of Point system) are two distinct formulas. CRA counts in all games played and generates without exception even during retired matches and substituting. The CRA varies with the level of performance in a match. The MNP only adds up the wins and only increases with a win. Although the CRA and MNP give us an idea of the level of play of a player, the two are independent.