Correspondence chess is chess played by various forms of long-distance correspondence, traditionally through the postal system. Today it is usually played through a correspondence chess server, a public internet chess forum, or email. Less common methods that have been employed include fax, homing pigeon and phone. It is in contrast to over-the-board (OTB) chess, where the players sit at a chessboard at the same time, or play each other in real time via the internet. Correspondence chess allows people or clubs who are geographically distant to play one another without meeting in person. These distant relationships are just one of the many distinct appeals of correspondence chess.[1] The length of a game played by correspondence can vary depending on the method used to transmit moves: a game played via server or by email might last no more than a few days, weeks, or months; a game played by post between players in different countries might last several years.