how to make a game

What I need is how to make a game.
It's bad to shot simply. Player need low speed shot and high speed one accordingly. It is the best that we do what competitor hate and make a chance. As a result, we can get a point.

Which point we get is also important. If the score is 30-15 and lead by me, we had better get a point, because we can make the point 40-15. If not, the point is 30-30. They are extremely different. Tennis is not a sports which just shot, is important to make how we make a strategy.

http://www.izu-kamori.jp/sports-villa/tennis/img/tennis_title.jpg