Today I have solved the problem in javascript

In chess, the Elo rating system is used to calculate player strengths based on game results.

A simplified description of the Elo system is as follows. Every player begins at the same score. For each subsequent game, the loser transfers some points to the winner, where the amount of points transferred depends on how unlikely the win is. For example, a 1200-ranked player should gain much more points for beating a 2000-ranked player than for beating a 1300-ranked player.Implement this system.

var playerA = 1200;

var playerB = 2000;

var result = 1; 

var kFactor = 32; 


var newRatings = updateRating(playerA, playerB, result, kFactor);

function expectedScore(ratingA, ratingB) {

    return 1 / (1 + Math.pow(10, (ratingB - ratingA) / 400));

}

function updateRating(ratingA, ratingB, result, kFactor) {

    var expectedScoreA = expectedScore(ratingA, ratingB);

    var expectedScoreB = expectedScore(ratingB, ratingA);


    var newRatingA = ratingA + kFactor * (result - expectedScoreA);

    var newRatingB = ratingB + kFactor * ((1 - result) - expectedScoreB);


    return [newRatingA, newRatingB];

}console.log("New rating for Player A:", newRatings[0]);

console.log("New rating for Player B:", newRatings[1]);

Output:

New rating for Player A: 1231.6831683168316
New rating for Player B: 1968.3168316831684

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