When an attacking player places the ball on or above the opposing score line, a point is given. Every attempt is worth one point. A try earns two points. The dummy half is unable to score a try. After the ball carrier has touched the ball with his foot, the defensive players can move. If a player makes more than one effort at scoring a try, only the first attempt counts. In rugby union, the term "dummy" is used to describe the role of a player who is not involved in the actual play of the game but whose presence is needed to make up the number of players required for a valid set of fixtures. This could be because they are a replacement player or because it is required by law for teams to have the same number of players on the field at all times. The word "dummy" comes from the practice of using hand-held sticks called "dummies" to protect against injury if a player were to be hit by the ball or another player. During a rugby match, a player may be awarded a "try" when he brings the ball into contact with the ground before either advancing it or kicking it. The referee will call "Try!" and give the player a free kick (worth three points) in the opposition's territory. The player must then either touch the ball down again before any opponent, including himself, touches it or advance it beyond his own try line.