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Elo system broken

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Junior Member



There is no way to do Elo "incorrectly"; there is an established formula which has been used for many decades. With a minor understanding of statistics, one can see that this formula will be a fairly accurate predictor (though one could argue that it can be slightly less efficient for team games such as League of Legends).

The Elo rating system assumes that player skill is distributed according to a normal distribution with known mean and unknown variance. The number of Elo you gain/lose by playing a game is relative to the probability of you winning or losing that game, based on your current Elo and your opponent's current Elo. Gaining fewer points from winning than from losing implies that in both circumstances you are playing someone with a lower Elo than you.