This is a simple game know from Roman times. Both sides set three stones, then move the stones. The side with three stones in a row wins. However, the computer plays this game in an optimal way. So you can't win. Sorry!
To set a stone click on one of the nine points on the board. To move a stone once all stones are set click on the stone and the target field. After a game is finished a new game will start with sides switched.