four players in the close defense. One player is the marker, also called the "rabbit", "chaser" or "puke" because they often have to run quickly between multiple handlers spread out across the field. The other three defenders form a horizontal "wall" or line across the field in front of the handler to stop throws to short in-cuts and prevent forward progress. The players in the second group of a zone defense, called "mids" and "deeps", position themselves further out to stop throws that escape the cup and fly upfield. A variation of the 1-3-3 is to have two markers: The "rabbit" marks in the middle third and strike side third of the field. The goal is for the "rabbit" to trap the thrower and collapse a cup around her or him. If the rabbit is broken for large horizontal yardage, or if the disc reaches the break side third of the field, the break side defender of the front wall marks the throw. In this variation the force is directed one way. This variation plays to the strength of a superior marking "rabbit". Junk and clam A junk defense is a defense using elements of both zone and match defenses; the most well-known is the "clam" or "chrome wall". In clam defenses, defenders cover cutting lanes rather than zones of the field or individual players. It is so named because, when played against a vertical stack, it is often disguised by lining up in a traditional person defense and right before play starts, defenders spread out to their zonal positions, forming the shape of an opening clam. The clam can be used by several players on a team while the rest are running a match defense. Typically, a few defenders play match on the throwers while the cutter defenders play as "flats", taking away in cuts by guarding their respective areas, or as the "deep" or "monster", taking away any deep throws. This defensive strategy is often referred to as "bait and switch". In this case, when the two players the defenders are covering are standing close to each other in the stack, one defender will move over to cover them deep, and the other will move slightly more towards the thrower. When one of the receivers makes a deep cut, the first defender picks them up, and if one makes an in-cut, the second defender covers them. The defenders