Checkmate is the ninth episode of the television series The Prisoner. The show starts off with a game of chess using people in the courtyard. One of the rebellious rooks is taken to the hospital for "evaluation". After the game, Number 6 talks with the Chess Master, who comments that one can tell who is a prisoner and who is a guardian “[B]y their disposition. By the moves they make.” Number 6 later visits the hospital to inquire as to the fate of the rook, and sees him subjected to mind control exercises. Number 6 seeks an alliance with the rook, and other villagers that he can now identify as prisoners. Together they attempt an escape by building a 2-way radio and hoping to signal any passing ships. But he discovers he has been a pawn all along.