Fischer delay is popular: the time control is specified by two numbers, the minutes each player is allotted at the start of the game, and the seconds added to a player's clock after making a move (the "increment"). For example, in the popular 2–12 time controls, each player receives 2 minutes at the beginning of the game, and 12 seconds are added to a player's clock after they make a move. Since all games are assumed to last 40 moves for format classification purposes, 2–12 is grouped with 10-minutes-per-player (10=2+12*40/60).