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mkuklis/gist:5942570

Created July 7, 2013 06:39
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elo rating
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gistfile1.js
function elo(oldRating, opponentRating, result) {
var kFactor;
var expected = 1.0 / (1.0 + Math.pow(10.0, ((opponentRating - oldRating) / 400)));
if (oldRating < 2100) {
kFactor = 32;
} else if (oldRating >= 2100 && oldRating <= 2400) {
kFactor = 24;
}
else if (oldRating > 2400) {
kFactor = 16;
}
return oldRating + kFactor * (result - expected);
}
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