Move-counter

A clock move-counter strictly records how many times each player has pressed the clock, the action that stops their time and starts the opponent’s. Many digital clocks display the number to manage time controls, the rules that set how much time each player receives and when more is added. For example, an additional period may begin after a specified number of moves.

The name can be misleading because the device does not understand the position or verify legality. If someone presses without moving, forgets to press, makes an extra press, or uses an incorrect setting, the counter may not match the moves actually played.

The displayed count is therefore not enough by itself to support a claim. The scoresheet, the written move record, the board position, observations by the arbiter, who applies the rules, and other evidence may be needed. After an irregularity, the arbiter may correct both the times and the counter.

Current standards for digital clocks require the completed-move count to be available for display and allow the arbiter to correct time and move counts quickly. An ordinary mechanical clock usually has no automatic version of this feature.