Chess time control notation explained

Common chess clock notation

Read 10+5 and 3+2

In the common increment format, the first number is each player's starting minutes and the second is seconds added after that player completes a move. So 10+5 means ten minutes plus five seconds per completed move. Likewise, 3+2 means three starting minutes plus a two-second increment.

Recognize controls without a bonus

A single number such as 5 minutes may mean one five-minute bank with no increment or delay. Some interfaces write this as 5+0 to make the missing bonus explicit. Confirm the bonus type instead of assuming zero means a hidden delay.

Read staged tournament controls

A longer event may state a move threshold, a time addition and a final period in words or a multi-part shorthand. Translate it into a sequence: starting bank, moves required, time added at the threshold, final bank and any increment. The event's published regulations control when shorthand is ambiguous.

Source for the factual guidance above: FIDE Laws of Chess.

Check the clock before move one

After entering the values, start one timer, allow a few seconds to pass and press twice. Confirm both players began with the same bank and that the expected bonus appears at the expected time. This small test catches a wrong unit or timing mode before it affects a result.

Translate notation into clock fields

Turn every written control into a checklist before entering values. For 15+10, write base time: fifteen minutes; method: increment; bonus: ten seconds; stages: none. For 5+0, write base time: five minutes; increment: zero; delay: off. For a delayed control, state the word delay because plus notation is commonly read as increment. This translation prevents unit errors and makes it possible for the other player to verify the setup without navigating the same device menu.

A staged-control worksheet

For a control that grants one bank for forty moves and another bank afterward, record five items: initial time, move threshold, added time, continuing bonus, and final phase. Ask whether the added block appears after one player's fortieth press or under another event-specific procedure. Do not assume the move counter proves that forty legal moves were completed. Keep the event schedule and scoresheet available. A worksheet is especially useful when a hardware clock compresses a complex sequence into an undocumented mode number.

Notation mistakes to catch

Check minutes versus seconds, increment versus delay, and per-player versus total session time. Confirm whether a colon is showing hours and minutes or minutes and seconds. A label such as rapid describes a category, not a complete setting. A plus sign usually signals increment in common online notation, but an organizer's written regulations remain controlling. Finally, test the threshold and bonus behavior, not only the opening display. Most setup errors look perfectly plausible at move one.