Key Features of the CIS Rating System
Saturday, 19 November 2011 13:34

Key Features of the CIS Rating System: [Download ]

(1) Initial Rating
between 600 and 900 based on age

player entering the CIS rating pool will immediately receive an initial rating
based on their exact current age.  A
player aged 6 years or younger will receive a rating of 600, a player aged 12
years or older will receive a rating of 900, and players with an age between
6.00 years and 12.00 years will receive a proportional rating between 600 and
900, depending on age.  Each completed
month beyond a player's 6th birthday will count for 4.167 (i.e., 50 divided by
12) extra rating points in the calculation of this initial rating, so that the
possible initial ratings are 600, 604, 608, …, 892, 896, 900.


(2) Education Bonus
of 5 points per monthly lesson (maximum nine lessons per year)

player acknowledging completion of a month's lesson will receive an immediate
Education Bonus of 5 rating points from that lesson.  Players can only receive this bonus once
during each calendar month, and cannot receive more than 45 Education Bonus
points in a single school year.

(3) Renewal Bonus
of 30 points for annual renewal

player renewing their membership for an additional year will receive an
immediate Renewal Bonus of 30 rating points. 
Players can only receive this bonus once during each school year.  If the player's rating, after receiving the
Renewal Bonus, is still below the age-based initial rating that a new player at
their current age would receive, then upon renewal their rating will be
elevated to that level instead.

(4) Linear Elo
adjustment for CIS-rated games

each game played by a CIS-rated player against a CIS-rated opponent, the
player's CIS rating will be adjusted in an Elo-like way, but with a simple
Linear Elo relationship (and K=40) that does not depend on an expectancy table
lookup.  A player with a 400-point rating
advantage will have an expected score of 100%, and a difference in rating of
more than 400 points shall be counted for rating purposes as though it were a
difference of 400 points.

(5) Rating
Adjustment extremely easy to calculate

the maximum effective rating difference is 400, and the K-factor for Linear Elo
is 40, players can easily calculate their rating adjustment from a game without
needing a calculator or an expectancy table. 
The rating change from a draw will simply be the quantity: [rating
difference divided by 10], and the rating adjustment from a win or loss will be
that same quantity plus/minus 20.  For
instance, if your rating is 720 and my rating is 750, then the rating
difference is -30 and so I will lose 3 rating points (that's -30 divided by 10)

if we draw the game.  Taking that value
(-3) and adding/subtracting 20 tells me that I will gain 17 rating points if I
win the game, and I will lose 23 rating points if I lose the game.

(6) Activity Bonus

of 1 point per game played

For each game played during a calendar month (up to a maximum of 20 during
that month), a player will receive an Activity Bonus of 1 rating point. 
This bonus will apply, whether the opponent is FIDE-rated, or CiS-rated, or neither,
or both, whether s/he is registered with FIDE or not.  After 20 such games in a single month,
games played against CiS-rated opponents will still affect a player's rating, but only from
the Linear Elo adjustment; the Activity Bonus will no longer apply during that calendar month. 
Note that you will still be motivated to play a game even if matched against an opponent rated
400+ points lower, despite your expected score being 1.00, since you can still receive
the Activity Bonus of 1 point for playing the game.

(7) CIS ratings
kept separate from FIDE ratings

a CIS-rated player faces an opponent, it does not matter whether that opponent
has a FIDE rating.  The game will still count
toward an Activity Bonus (assuming the player has not reached the monthly
maximum of 20), but the Linear Elo system only applies if both players are
CIS-rated.  Thus the pool of CIS ratings
and the pool of FIDE ratings do not affect each other.  Nevertheless, it will be very important in
upcoming years to understand the relationships (and possible conversions)
between CIS ratings and regular FIDE ratings. 
In order to support this future understanding, we will track a detailed
history of all events (lessons, renewals, all games played against FIDE-member
opponents with/without FIDE ratings, and with/without CIS ratings).  This history will eventually enable us to
improve the quality of the CIS ratings and bring them more in line with the
FIDE rating pool.

(8) Encouraging weaker
players to enter FIDE rating pool

cannot draw concrete conclusions about the true strength of scholastic players,
because we don't have games between scholastic players and FIDE-rated
opponents.  In order to bring these two
groups closer together, so that we can eventually calibrate the CIS ratings
against the FIDE rating pool, we recommend lowering the minimum FIDE rating to
1000 or even lower, and providing financial incentives to member federations for
weaker players to obtain FIDE ratings.

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