Chess Clock

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Chess Clock


a clock for recording the time spent by each chess player in considering his next move during a game of prescribed duration.

A chess clock usually consists of two clock movements in a single case with two faces and two hands. The two movements are kinematically connected in such a way that at any given moment only one clock is running. Pushing the buttons located in the upper part of the case starts one clock and simultaneously stops the other. After making his move, the player pushes the button, stopping his own clock and starting his opponent’s clock. Thus the total playing time is calculated separately for each player. Two to three minutes before the prescribed playing time elapses, the hand of the clock raises a flag. As soon as the hand reaches the numeral 12, the flag falls, signaling that the playing time has expired.

Chess clocks are sometimes equipped to indicate how many times a button has been pushed. Some clocks consist of a single continuously running movement and hands that are switched on and off by pushing a button. Another type of clock has a separate case for each movement. Chess clocks are usually accurate to 60 sec per 24 hr. Digital electronic chess clocks are now being developed (1978).

Mechanical chess clocks were introduced in Great Britain in the mid-19th century, until which time sandglasses were used. They were first used in an international tournament in 1883, in London.


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The use of the chess clock ensures games are played out to a pre-determined time limit -locally the rate is each player has 90 minutes to make 36 moves.
IN 1988 he filed a US patent for a digital chess clock that gave each player a fixed period of time at the start of the game.
expired; the chess clock kept record of every minute of my
The players use a chess clock to keep the pressure on, and the game is fast-paced.
Instead, he rose for work at Big Bear to the ticking of his wooden Jerger, his big lumbering chess clock with two round clock faces that loomed over their bed like the portholes of a tiny ship.
It's hard to see a reason in principle why enfeebled base runners now shouldn't ask for motorized buggies to help in their attempts to steal third, or why slow pawn pushers shouldn't get double time on the tournament chess clock if they bring in a note saying they're learning disabled.
I gave a hypothetical case, where Black appeared to be completely lost and had only five minutes left on his chess clock.
All rated OTB chess games must be timed by a chess clock which keeps track of the time used up (and thus remaining) for each player.