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GigaRatings is a points based rating system aimed at regional/national sports associations based on sound probability theory. Scales, constants and variables are set by the association. The algorithm used to calculate a player's new rating after playing a match is based on Professor Arpad Elo's algorithm used by the National Chess Federation.
It is based on the probabilities of winning or losing the match. If a player plays a much higher rated player, then his/her probability of winning that match is small. Thus, if he/she wins that match, then his/her rating is adjusted upward by a lot. On the other hand, if they lose that match, their rating is lowered only very slightly, if at all. Conversely, the higher rated player would have their rating lowered by a lot if they lost to the much lower rated player, but only raised by a little, if at all, if they win that match.
The math behind the algorithm is as follows:
WOR = Winner's old rating
WNR = Winner's new rating
LOR = Loser's old rating
LNR = Loser's new rating
K = constant
D = denominator
PW = Probability that the winner would win
PL = Probability that the loser would win
WNR = (WOR+K*(1-PW))
LNR = (LOR+K*(0-PL))
PW = (1/(POWER(10,(-(WOR-LOR)/D))+1))
PL = (1/(POWER(10,(-(LOR-WOR)/D))+1))
Like all GigaSports products, GigaRatings is an online based system, but it is not a real time system. When matches are input, new ratings are not
immediately available online - first the GameMaster (administrator) must ensure that all matches were input, that they are in the correct order, that new players are
allocated initial ratings etc. When all this is done, the GameMaster calculates a new Baseline using the previous Baseline and all the matches that have
been recorded since. A Baseline is a stored record of all rated players as of a specified date.
After the GameMaster has reviewed the new Baseline and made any necessary adjustments, he/she can release the results to the general
public with one click.
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