Chess Clock
The chess clock consists of two clocks that recorded the time spent by cadajugador to think your moves in a chess game. The typical analog chess clock is shown in the picture. Each of the clocks corresponding to the time of a player. By clicking the button above the clock, the clock stops and starts running the other (never both clocks are running simultaneously). That is, while a player is thinking about his move, will elapse time. When you make your move, press the button corresponding to your watch and so begins to run from the time of his rival. In analog watches, when a player has five minutes or less, start up the little red flag. When the flag drops, it means that the player's time is over, and loses the game.
Currently often use digital clocks, which are much more accurate, but still used analog watches.
There are many different rhythms of play. Since the rapid games with 5 minutes per player, to the classic rhythm games, with 2 hours per player and an hour once the move 40. The introduction of digital clocks used has allowed new types of time controls. For example, currently the "normal" rate of tax set by the International Chess Federation (FIDE) is 90 minutes per player for the entire game plus 30 seconds increment for every move made, allowing a player always remain at least 30 seconds to make his next move. This type of game control with time increment was conceived by former U.S. world champion Bobby Fischer, hence originally be named "Fischer clock."
The reason for the introduction of the clock in the chess competition is simple: check the total time that can last a game. Before its introduction the games could go on for hours and hours (even days) and each player could think as long as deemed appropriate.
Source: http://es.wikipedia.org/wiki/Reloj_de_ajedrez
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