IRTPA

Ranking Algorithms

Published below is how the ‘value’ of a tournament is achieved.

Each tournament is given a value according to the quality of entry at the date of the completion of the event, the then current world top ten is calculated; number 1 gives a value of 10, number 2 of 9, down to number 10 who gives a value of 1. These values (of those in the top ten who entered the tournament) are added together and the result divided by 12. If the tournament had best-of-three-set matches, 1 is subtracted. If it is a grand slam event (a National Open Tournament) the number is doubled. This gives us the intrinsic tournament value.

If it is the World Championship, the intrinsic tournament value is always 15.

For the rankings at the date required, tournaments more than three years old are worth nothing. Tournaments more than two years but less three years old are worth half their intrinsic value,tournaments more than a year but less than two years old are worth their intrinsic value, and tournaments less than year old are worth double their intrinsic value. This gives us a weighted value for each tournament.

For each player, every tournament is examined. For each tournament the player has entered, the winner is awarded ten times the weighted value for a win, six times the weighted value for being a finalist, thrice for being a semi-finalist, and once the weighted value for being a quarter-finalist, or nothing for being a loser. The accumulation of these tournament points is divided by the sum of the weighted values of the tournaments he/she entered, giving an average per tournament (if this is less than 1 then it becomes 1). The player’s accumulated points are multiplied by this average.

The value for each player is ‘beautified’ without changing the relative rankings by taking its square root and multiplying by 10. A comparison of these “ranking points” numbers gives the positional rankings for the date required.

It should be noted that rankings points are only gained by winning matches. Where a player advances to the rankings points-scoring stage by virtue of a bye and then loses the first match that he/she has played and therefore has had no opportunity to win a match beforehand, the compromise solution is to not record the player’s involvement. This will reduce the tournament value but not affect the rankings points of the player concerned.

Race Points

The Race Points work exactly like the Ranking Points with the following exceptions.

  1.  a) The rankings at the date required. This date is always the 31st of December at the end of the two year cycle. For example the Race Points leading up to the World Championships in 2020 will be at a fixed date of 31/12/2019.b) The tournament weightings. Tournaments more than a year old but less than two years old are worth their intrinsic value, and tournaments less than a year old are worth doubles their intrinsic value.

Because this system is set towards a fixed date, Race Points will seem to accumulate towards this goal. In comparison, the World Ranking Points are on a three year rolling system where old results fall off as new ones come in.