Elo Rating System

• An implementation of the Elo rating system in JS.

Demo

• https://elo-rating.firebaseapp.com/

Formulas

• R'a = Ra + K(Sa - Ea)

• R'b = Rb + K(Sb - Eb)

• R'a/R'b - New ratings of player A and player b

• Ra/Rb - Old ratings of player A and player b

• K - "K factor" set it as 32 for now

• Sa/Sb = Actual score

• Ea/Eb = Expected score

  • Ea = 1/(1 + 10 ^ ((Rb-Ra) / 400) )
  • Eb = 1/(1 + 10 ^ ((Ra-Rb) / 400) )

Dependencies

• AngularFire 2.0.2
• Google AngularJS 1.5.8
• Google Firebase 3.4.0
• Bootstrap 3.3.7
• Angular UI for Bootstrap 2.1.3
• JQuery 3.1.0

Configuration

• Please configure Firebase URL in app/js/config.js before running.

// your Firebase URL goes here
var config = {
    apiKey: "AIzaSyATrephRZpug-hcuwhELSx5p4ZGj0xPfdA",
    authDomain: "elo-rating.firebaseapp.com",
    databaseURL: "https://elo-rating.firebaseio.com",
    storageBucket: "elo-rating.appspot.com",
    messagingSenderId: "332514913142"
};

• Set up Email/Password authentication in Firebase.

  • Log in to Firebase console, open the Auth section
  • On the Sign in method tab, enable the Email/password sign-in method and click Save.
  • Add email and password to Users tab

• Replace line 80 & 81 in app/js/controller.js with your own credentials you just set up.

$scope.email = "admin@mydomain.com";
$scope.password = "password";

Contributing

1. Fork it ( https://github.com/cdeng/elo-rating/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

License

Code released under the MIT license.