Chess clock

A game clock consists of two adjacent clocks and buttons to stop one clock while starting the other, such that the two component clocks never run simultaneously. Game clocks are used in two-player games where the players move in turn. The purpose is to keep track of the total time each player takes for his or her own moves, and ensure that neither player overly delays the game.

Game clocks were first used extensively in tournament chess, and are often referred to as chess clocks. Often in chess tournaments, the player of the black pieces can make the decision as to what side of the chess board he or she would like the clock to be placed. But their use has since been adopted for tournament Scrabble, Shogi, Go, and nearly every competitive two-player board game, as well as other types of games such as Magic: The Gathering Online. The first time that game clocks were used in a chess tournament was London, 1883.

The simplest time control is "sudden death", in which players must make a predetermined number of moves in a certain amount of time or forfeit immediately. A particularly popular variant in informal play is blitz chess, in which each player is given five minutes on the clock for the entire game.

The players may take more or less time over any individual move. The opening moves in chess are often played quickly due to their familiarity, which leaves the players more time to consider more complex and unfamiliar positions later. It is not rare in slow chess games for a player to leave the table, but the clock of the absent player continues to run if it is his turn, or starts to run if his opponent makes a move.

Analog game clocks

A typical analog chess clock.

Analog clocks (as pictured to the right) are equipped with a "flag" (a Dutch invention) that falls to indicate the exact moment the player's time has expired. Analog clocks use mechanical buttons. Pressing the button on your side physically stops the movement of your clock and releases the hold on your opponent's. The drawbacks of the mechanical clocks include accuracy and matching of the two clocks, and matching of the indicators (flags) of time expiration. Unfortunately, additional time can't easily be added for more complex time controls, especially those which call for an increment or delay on every move, such as some forms of byoyomi. Therefore more versatile digital clocks are becoming increasingly popular. Even so, some people consider analog clocks to be nicer than the digital clocks, and a malfunctioning analog clock is a less serious event than a malfunctioning digital clock.

Early development of digital game clocks

Digital chess clock

In 1973, to address the issues with analog clocks, Bruce Cheney, a Cornell University Electrical Engineering student and chess player, created the first digital chess clock as a project for an undergraduate EE course. Typical of most inventions, it was crude compared to the products on the market 30 years later and was limited by the technology that existed at the time. For example, the display was done with red LEDs. LEDs require significant power, and as a result, the clock had to be plugged in to a wall outlet. The high cost of LEDs at the time meant that only one set of digits could be displayed, that of the player whose turn it was to move. This meant that each player's time had to be multiplexed to the display when their time was running. In 1973, LSI chips were not readily or cheaply available, so all the multiplexing and logic were done using chips that consisted of four two-input TTL NAND gates, which resulted in excessive power consumption. Being plugged into the wall is obviously a major drawback, but had one advantage: the timebase for the clock was driven off of a rectified version of 60 cycle AC current. Each player had a separate counter, and, in a parallel to the original mechanical architecture, one player's counter was disabled while the other's was running. The clock only had one mode: time ran forward. It could be reset, but not set. It did not count the number of moves. But it successfully addressed the original goals of the project (accurate and matched timing).

Recent developments of digital clocks and current usage

Digital chess clock connected to a board that automatically senses when moves have been made.

Digital clocks and Internet gaming have spurred a wave of experimentation with more varied and complex time controls than the traditional standards. Time control is commonly used in modern chess in many different methodologies. One particularly notable development, which has gained quite wide acceptance in chess, was proposed by former world champion Bobby Fischer, who in 1988 filed for U.S. patent 4,884,255 (awarded in 1989) for a new type of digital chess clock. Fischer's digital clock gave each player a fixed period of time at the start of the game and then added a small amount after each move. In this way, the players would never be desperately short of time, but games could also be completed more quickly, doing away with the need for adjournments (in which a game is left incomplete to be finished at a later date). Although it was slow to catch on, as of 2004 a very large number of top class tournaments use Fischer's system, though usually in combination with the more traditional clocks (at lower levels, more traditional clocks are still employed as they are cheaper). Other aspects of Fischer's patent, such as a synthesized voice announcing how much time the players have, thus eliminating the need for them to keep looking at the clock, have not been adopted.

Time controls

Main article: Time control

File:DGT 2010 chessclock.jpg

A modern digital chessclock with some time controls and bonus options

There are five main types of Time Controls: (1) Fischer (invented by Bobby Fischer), (2) Bronstein (invented by David Bronstein), (3) Simple Delay, (4) Game Word and (5) Hour Glass. The first three time controls implement some sort of delay clock, a small amount of time that is added for each move. The reason is that with a sudden-death time limit, all moves must be completed in the specified time, or the player loses. With a small delay added at each move, the player always has at least that much time to make a move. The two types of delay clocks differ in how the delay is implemented. The last two time controls are somewhat different, as they do not rely on time delay, and will be explained below.

• Fischer—before a player has made his move, a specified time increment is added to his clock. Time can be accumulated, so if the player moves within the delay period, his remaining time actually increases. For example, if the delay time is five seconds, and a player has four seconds left on his clock, as soon as his opponent moves, he will receive the increment and have nine seconds to make a move. If he takes two seconds to move, then on the start of his next move he will have seven seconds. There is also a variant of this time control which the delay is added after a player has made his move (Fischer after), so that the delay is added to the player's remaining time, and will be available for his next move. If however time runs out during his move, the game ends without the delay time being added. This variant prevents the player who is in time-trouble to take advantage of the extra-time.

• Bronstein delay—with the Bronstein timing method, the increment is always added after the move. But unlike Fischer, not always the maximum increment is added. If a player expends more than the specified increment, then the entire increment is added to the player's clock. But if a player has moved faster than the time increment, only the exact amount of time expended by the player is added. For example, if the delay is five seconds, the player has ten seconds left in his clock before his turn and during his turn he spends three seconds, after he presses the clock button to indicate the end of his turn, his clock will increase by only three seconds (not five).

• Simple delay—when it becomes a player's turn to move, the clock waits for the delay period before starting to subtract from the player's remaining time. For example, if the delay is five seconds, the clock waits for five seconds before counting down. The time is not accumulated. If the player moves within the delay period, no time is subtracted from his remaining time. This time control is similar to a Bronstein with time added before the move.

• Word—it is a sudden death time control, without any increment nor delay. The difference here is that when the time expires by dropping to zero, a flag is set, and the clock immediately starts counting up without limit. This time control applies to games where the amount of time used after the allowed time can be subtracted of the player's score as a penalty.

• Hour Glass—Basically, a player loses in this time control when he allows the difference between both clocks reach the specified total amount. For example, if the total is defined as one minute, both players start their clocks at thirty seconds. Every second the first player uses to think in his moves is subtracted from his clock and added to his opponent's clock. If he uses thirty seconds to move, the difference between the clocks will reach one minute, and the time flag fall to indicate that he loses by time. If he has used twenty nine seconds and then pushes the clock's button, he will have one second left on his clock, and his opponent will have fifty-nine seconds.

External links

• U.S. patent 4,884,255 for Fischer's clock
• Browser based game clock
• Open Source Browser based game clock
• componentXtra - .NET components - offers a linkware downloadable chess clock program
• chess timer - freeware chess clock with six modes and tournament support
• Chess Clock used for iPhone - a Simple Chess Clock for iPhone