EXPLANATORY NOTES - NATIONAL RATING SYSTEM
The system now uses a slightly modified version of the
Glicko rating system which was designed by Professor
Mark Glickman who is Chairman of the USCF Rating Committee. The main difference
between the Glicko system and the Elo
system is that it introduces the concept of a RD or Rating Deviation which is
effectively a measure of how accurate is the players rating. Some info on the Glicko system it is available at http://math.bu.edu/people/mg/ratings.html
The Glicko system is used on the FICS (Free Internet Chess Server) and elsewhere.
For the December 2013 rating period there were 122 Tournaments rated (89 Classic, 33 Quick) and 10791 games of which 6389 were in the ACF Classic rating system and 4402 Rateable Games were in the ACF Quick rating system.
The ACF active list now shows the players active Australia wide rank (excluding OS) and their active state rank.
A rating is followed by either a !!, a !, a blank, a ?, a ?? or a g. A !! indicates a very reliable rating. A ! indicates a reliable rating. A blank indicates the rating is unreliable.. A ? indicates the rating is very unreliable. A ?? indicates the rating is extremely unreliable. A g following a number indicates the player needs that many more games before he will get a rating. A x following a rating indicates that it has expired since the player has not played a rated game in over 10 years. If a player with an expired rating returns and plays in an ACF rated event their new rating will be closely linked and in line with their performance rating and not necessarily their old expired rating. A player with an expired rating is not an unrated player.
Only players who have a rating followed by a ! or a !! and have a career total of at least 30 rated games are eligible for listing in the Top lists. Eligibility for the Top Improvers list requires you to have completed a career total of at least 30 games in the prior ratings list and a rating followed by a ! or !! in the current list and the previous list.
Players are reset as unrated if:
1) They have played less than 9 rated games in total and have not played in the last 2 years.
2) They have played less than 30 rated games in total, have not played in the last 3 years and were a junior when they last played.
3) They have played less than 30 rated games in total and have not played in the last 5 years.