How to calculate the rules of table tennis competition?

Get 1 minute. According to Jin Chuku, the line pressing is a good shot, which is equivalent to hitting just behind the center line. If the opponent fails to catch the ball, the server gets 1 point. When table tennis doubles serve, the ball hits the center line of the table, which is a good ball (that is, an effective serve), and the game is normal. That is, in table tennis doubles, the ball is served to the opponent's center line, which is an effective serve and a good ball, and the game is normal. According to the rules of table tennis doubles, when serving, the ball must first fall to the right half of the opponent's side and then directly fall to the right half of the opponent's side. The midline is regarded as a part of the right half.