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A chess server allows the playing of a game, both opponents stay in the logged during the entire game. It can select various time controls and in some cases chess variants. Chess servers offer many so-called one-click entry of trains leave, which allows trains to run very quickly or set already as Antwortzug on any Gegnerzug. This very rapid time controls are available (one minute per game), known as Bullet. Due to the continuous availability of server chess opponents have sometimes led to a popularization of rare chess variants, such as Crazy House or tandem chess. In chess servers can be also compete against each other chess programs. Some authors of chess programs, chess server use to test your program against human opponents, and other programs.

A major problem in chess servers, the fraud by computer assistance during the games. Some chess servers have therefore developed algorithms with which they study the games on computer support. The operation of these algorithms is controversial and secret, but at least the commercial chess server operators are offensive action against fraudsters in order to address complaints from the community of users.
Fernschachserver

A Fernschachserver appropriate to play games with very long thinking time (several days per train), register themselves the adversaries just for the Zugabgabe and log off again afterwards. On a Fernschachserver leads to the trains on a board made clickable on a web site and confirmed by a preview of the train. This changes the Zugrecht, and the reflection of the enemy starts to run. The enemy is aware of the train were made by e-mail. Fernschachserver generally require no own access software, but will be served directly in the browser.

Fernschachserver have won in the last years of correspondence chess very popular. The transfer of the trains in the chess set always a technical and organizational challenge was well long term post it to misconceptions and errors in the transmission as well as disputes over the spent cooling. By Fernschachserver one hand, a transfer of trains is possible without loss of time, and on the other hand the game over and the cooling-managed at the server, so that there can be no misunderstandings occur over the course of game. Most also offer Fernschachserver Zugvalidierung and management of vacation time in a tournament.
Known Chess Server


A well-visited server with free full membership is called the Free Internet Chess Server.

The server is maintained by volunteers. Volunteers play games in real-time champion, which were broadcast on television, on the server, the latter may be that from any Internet connection from discussions with peers about the game.

Registered players will receive ranking points, which are placed after each game up to date. The skill level ranges from absolute beginner level to upscale club level, but also some players with master level are regularly online. A unique feature is that the rating with the additional indicator RD - ratings deviation (English for "playing strength deviation") - is refined. A player plays for a long time several times a day, then you can his game performance to determine more reliable, and has for example, a rating of 1500 as a "true" value of 1485-1515, he has not played for several months, a real value between 1150 and 1800.

The server offers several programs such as free access to the program Winboard (for Unix: xboard or eboard) the possibility to login via Java client. A special service is called the Teaching Ladder, can analyze each of the players on the play of other players.

Although not strictly required, provides the application on the server. Since unregistered players have no skill level assessment, reject many registered players from the game against unregistered opponents.