time control

In chess, time controls are used to ensure fairness and prevent games from lasting excessively long. Initially, players had unlimited time, but this led to games stretching for many hours, with some moves taking over two hours. This prompted the introduction of time limits, first using sandglasses in 1861, and later mechanical clocks.

The most popular system, proposed in the 19th century, allows each player a set amount of time to complete a predetermined number of moves. For example, two hours for 30 moves. If a player completes the required moves, they receive additional time for subsequent moves. Exceeding the time limit results in forfeiture of the game. Modern digital clocks provide precise timekeeping, but the core principle of budgeting time for moves remains central to competitive chess.123