1. Parents, as relatives of the players, will have subjective expectations and evaluations of the competition results, thus affecting the evaluation of the competition. If parents watch the game on the spot, there will be interference and pressure, which will lead to unstable performance of the players and affect the fairness and justice of the game results.

2. When parents watch the game, there will be some noise and interference, which will also affect the progress and judgment of the game. For example, parents will cheer and cry during the competition, which will interfere with the performance and judgment of other players.