question

ok thanks Andy - ya maybe it was a different I ended up making something quick for now

//get ELO Rating
function GetELORating(args) { 
  var DuelELORatingStat = {
    statname: "DuelELORating",
    playerid: currentPlayerId 
  };
 return  Server.GetPlayerStatistics(DuelELORatingStat);
}


//update ELO Rating
function UpdateELORating(args) { 

var stringifiedJSON = GetELORating(currentPlayerId);

//gotta destring it to provide the value
var destringedvalue = json.somethingtodestringit(stringifiedJSON);



  var DuelELORatingStat = {
    statname: "DuelELORating",
    playerid: currentPlayerId,
   value: destringedvalue.value
  };
  Server.UpdatePlayerStatistics(DuelELORatingStat);
  return true;
}




//update Player statistic
function UpdatePlayerStat(args){
var UpdateStatisticForPlayer = {
   PlayFabId: args.playerid,
  "Statistics": [
    {
      "StatisticName": args.statname,
      "Value": args.statvalue
    }
   ]
};
server.UpdatePlayerStatistics(UpdatePlayerStatistics);
    return true;
}







//elo rating functions
function getRatingDelta(myRating, opponentRating, myGameResult) {
    if ([0, 0.5, 1].indexOf(myGameResult) === -1) {
      return null;
    }
    
    var myChanceToWin = 1 / ( 1 + Math.pow(10, (opponentRating - myRating) / 400));
   return Math.round(32 * (myGameResult - myChanceToWin));
  }


  function getNewRating(myRating, opponentRating, myGameResult) {
    return myRating + getRatingDelta(myRating, opponentRating, myGameResult);
  }

the tutorial i was thinking of was just basically like - had a skill or something not sure if it had a comparison or anything which is what i was looking for -- So here is what i ended up making and needs to fix up a bit - double quoting and trying to destringify JSON things to pull the correct statistic - What i am worried about using this method is that if each function call may impact the request limitations.