New Ranking System

Introduction

Table Tennis England has commissioned a new Ranking System for the 2014/15 season.

Our old computer rating system was written by Adam Twiss in 1993 and was greatly admired, but had limitations as a standalone system.

Our new computer rating system has been developed by Table Tennis 365 and builds on the principles of our old system, whilst addressing the known limitations. Our new system has a number of major improvements which will lead to more accurate, faster and fairer ratings for all.

Major changes in the new system are:

·        We now operate on a single fixed season of 1st August to 31st July.

·        Results will be applied from the date of the tournament and no longer from the period the results are entered in.

·        Improvements have been made to decrease the amount of time it takes to achieve a new rating and appear on the lists.

·        Input errors, when corrected, are recalculated from the date of the tournament, leading to more accurate ratings for all.

The Principles of the Ranking System

This guide aims to cover how the principals of the Ranking Scheme work in a manner suitable for the experienced and novice alike.

Should you have any questions unanswered by this guide, please contact us on 01908 208898 and we will endeavour to answer them for you.

The Principles of the Ranking System

The Table Tennis England Ranking Scheme was born from the need for some system of determining the relative standards of our players. Above all else, the system needed to be fair and based on objective criteria rather than on someone's subjective opinion.

Every player has a rating which is a guide to how good a player he or she is. If players improve, their rating will go up; if they experience a drop in performance, their rating will fall. The number of points gained or lost depends on the difference in ratings of the two opponents and the weighting of the tournament they are playing in.

The system works on the odds of whether a player should win or lose from the difference between the players ratings.

Players on equal ratings should have a 50-50 chance of winning or losing. The points to be won and lost are therefore high. Players with a separation of 100 rating points represents about a 1 in 4 (or 25%) chance of an upset, with the stronger player likely to win on three occasions out of four. The points won or lost here are therefore lower.

Whenever a match takes place between two players who have a large difference in ratings the expectation is that the stronger player will win. When the stronger player beats the weaker player there are only a few points to be gained or lost; if the weaker player unexpectedly wins there is a far greater gain of points for them and loss of points for their opponent.

The more results entered for any player, the greater the accuracy of the rating it produces. A player’s rating should eventually reach a stable level that reflects the balance between points won and points lost. When achieved, only an improvement in performance should improve the ranking position.

Since men do not play women at all levels, men's and women's ratings are not comparable in our system except at the very bottom.

For full details please download: The-New-Ranking-System-002.pdf

Author: via Chester and Ellesmere Port Table Tennis League
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