docs: function isOpponentsEqual(exOpponents, currentOpponents) {
      var ans = false,
          cOpponents = currentOpponents.sort();
  
      if (exOpponents.length) {
          exOpponents.forEach(function(i) {
              var array = i.sort();
  
              ans = (array.length == cOpponents.length) && array.every(function(el, index) {
                  return el === cOpponents[index];
              });
          });
      }
  
      return ans;
  }