Editing Chess clock (section)

{{short description|Two adjacent clocks with stop/start buttons}}
{{about|the device with two adjacent clocks used in chess and other games|a person who keeps track of the time during a sporting event|Timekeeper|the instrument that determines time elapsed or time remaining in sporting events|Game clock (sports)}}
[[File:Schachuhr mechanisch.jpg|thumb|upright=1.35|An analog chess clock]]
A '''chess clock''' is a device that comprises two adjacent [[clock]]s with buttons to stop one clock while starting the other, so that the two clocks never run simultaneously. The clocks are used in [[game]]s where the time is allocated between two parties. The purpose is to keep track of the total time each party takes and prevent delays. Parties may take more or less time over any individual move. 

Chess clocks were first used extensively in tournament [[chess]], beginning with a competition at the [[London 1883 chess tournament|London 1883 tournament]]. They are often called '''game clocks''', as their use has since spread to tournament [[Scrabble]], [[shogi]], [[Go (board game)|Go]], and nearly every competitive two-player [[board game]], as well as other types of games. Various designs exist for chess clocks and different methods of [[time control]] may be employed on the clocks, with "sudden death" being the simplest.