Capture the flag (CTF) is a traitional outdoor sport often played by children or sometimes adults where two teams each have a flag (or other marker) and the objective is to capture the other team's flag, located at the team's "base", and bring it back to their own base. One variation of the game includes a "jail" area in addition to the flag on each team's territory. If a member of one team gets tagged by a member of the second team in the second team's territory, the tagged person must sit in jail either for a pre-determined time limit, or until an untagged member runs through the jail. In some cases, particularly if the jail is far from the boundary line between territories, players may be allowed to form a "human chain" from the jail towards the boundary. This makes it easier to be "rescued", the more players are in jail. The purpose of this rule may be to reduce the possibility of games ending in a virtual stalemate: if one team has nearly all its players in jail, allowing the opposing team to focus exclusively on the remaining members, it can prevent them from effecting either the release of prisoners or the capture of the flag. With this variation, with mutual consent from both teams, "Jail Break!" may be called, and all players in jail have a chance to run to their respective sides to freedom.