anchor.diff:  
     refreshHighScoreLeaderboard() {
       if (gamesclient == null) return;
  -    
  +
       ScoreBoard highScoreBoard = scoreBoards
       .singleWhere((ScoreBoard sb) => sb.scoreType == ScoreType.HIGH_SCORE);
  -    
  +
       gamesclient.scores.listWindow(highScoreBoard.leaderBoardId,
           "PUBLIC", "ALL_TIME", maxResults: 25)
           .then((LeaderboardScores leaderboardScores) {
  
positive.code:             _playerLogger.fine("${lbe.player.displayName} ${lbe.scoreRank} ${lbe.scoreValue} ${lbe.timeSpan}");
              allTimeHighScores.add(new HighScoreInfo(lbe.player.displayName, lbe.scoreRank, lbe.scoreValue, lbe.timeSpan));
            });
            
          }).catchError((e) => _playerLogger.fine("Not able to refresh high scores: $e"));
    }
  }
negative.code: 
    void signedOut() {
      print("Player is signed out");
      isConnected = false;
    }
  
    Future<List<Person>> friends({String orderBy: 'alphabetical',
  