using System;                   

public class Program

{

​

    static double ExpectationToWin(int playerOneRating, int playerTwoRating)

    {

        return 1 / (1 + Math.Pow(10, (playerTwoRating - playerOneRating) / 400.0));

    }

    enum GameOutcome

    {

        Win = 1, 

        Loss = 0

    }

​

    static void CalculateELO(ref int playerOneRating, ref int playerTwoRating, GameOutcome outcome)

    {

        int eloK = 32;

​

        int delta = (int)(eloK * ((int)outcome - ExpectationToWin(playerOneRating, playerTwoRating)));

​

        playerOneRating += delta;

        playerTwoRating -= delta;

    }

    public static void Main()

    {

        var maxWinValue    = 60;

        var minWinValue    = 40;    

        var maxLoseValue   = 20;

        var minLoseValue   = 20;

        var playerRating   = 2850;

        var opponentRating = 2000;

​

        var victoryFormula = (int)Math.Floor(maxWinValue  / (1+Math.Pow(Math.Exp(1)*0.99f, 0.006f*(playerRating-opponentRating))));

        var loseFormula = (int)Math.Floor(maxLoseValue - maxLoseValue  / (1+Math.Pow(Math.Exp(1)*0.99f, 0.006f*(playerRating-opponentRating))));

        var victoryGain = Math.Max(minWinValue, victoryFormula);

        var lossGain = Math.Max(minLoseValue, loseFormula);

        CalculateELO(ref playerRating,ref opponentRating, GameOutcome.Win);

        Console.WriteLine("======WINNING======\n");

        Console.WriteLine("Win formula is   : " + victoryFormula);

        Console.WriteLine("Win player gets  : " + victoryGain);

        Console.WriteLine("");

        Console.WriteLine("======LOSING======\n");

        Console.WriteLine("Lose formula is  : " + loseFormula);

        Console.WriteLine("Lose player gets : " + lossGain);

        Console.WriteLine("======NEWFORMULA======\n");

        Console.WriteLine("Player is  : " + playerRating);

        Console.WriteLine("Player is  : " + opponentRating);        

    }

}