An increment clock (a clock with added time capabilities) is the standard timer. The increment clock is set to add time for each move, called an increment. The standard increment is 30 seconds per move.
A game with an increment time control should be set with the increment in effect from move one.
A game started without an increment-capable clock should remain the clock for the game.
If using increment time control it may not be to a player’s advantage to start the opponent’s clock if the opponent created an illegal position or accidentally displaced pieces. In that case the players may stop or pause the clock until the correct position is reinstated.
Players in games with increment time controls of 30 seconds or more and using properly set increment capable clocks are required to keep score at all times, even in the last five minutes of any time control period.