public void match(player two, double gameOutcome)
{
double R = this.R;
double RD = this.RD;
double R2 = two.R;
double RD2 = two.RD;
double outcome = gameOutcome;
// Constant Q
double q = 0.0057565;
// Several lines for readability
double TripleSquareQ = 3 * q * q;
double SquarePi = Math.PI * Math.PI;
double SquareRD = RD * RD;
// G func
double g = 1 / (Math.Sqrt(1 + TripleSquareQ * SquareRD / SquarePi));
// E(s|r, rj, RDj ) func on only one match
double X = 1 / (1 + Math.Pow(10,
(-((g * (R - R2)) / 400))));
// d² variable
double d = 1 / (Math.Pow(q, 2) * Math.Pow(g, 2) * X * (1 - X));
// Several lines for readability
double second = q / ((1 / Math.Pow(RD, 2)) + (1 / d));
// New rating of this.player
double newR = R + second * (g * (outcome - X));
// New rating deviation of this.player
double newRD = Math.Sqrt(Math.Pow(1 / Math.Pow(RD, 2) + (1 / d), -1));
// Updating this.player variables
this.R = newR;
// Mark Glickman says it is recommended to put a minimum limit for RD
// When the RD gets too low, the player's rating doesn't change enough
this.RD = newRD < 50 ? 50 : newRD;
// Player TWO is not updated !!
}
public MainWindow()
{
// I didn't put this in the view for the sake of lazyness
player one = new player()
{
R = 1200,
RD = 60
};
player two = new player()
{
R = 1200,
RD = 60
};
one.match(two, GameOutcome.WIN);
Console.WriteLine("New rating is : " + one.R);
Console.WriteLine("New RD is : " + one.RD);
InitializeComponent();
}