A chess clock looks fiddly until someone explains the three things that actually matter: what it’s doing, how to set it, and the rules for pressing it. Whether you’re holding a wind-up analog clock or a menu-driven digital one, here’s everything you need to walk into your first timed game knowing what you’re doing.
What a chess clock actually does
A chess clock is two clocks in one housing that can never run at the same time. Each player gets a fixed budget of time for the whole game. When it’s your turn your clock counts down; the instant you finish your move you press your button, which stops your clock and starts your opponent’s. The whole game is a shared race against two separate hourglasses.
If a player’s time hits zero before the game ends, they lose on time — provided the opponent still has enough material to deliver checkmate. That’s the entire idea. Everything else is just how different clocks let you shape that time budget.
Analog vs digital
There are two families of physical clock, and they’re set up in completely different ways.
Analog (mechanical) clocks are the classic wind-up kind, with two faces and a little lever called a flag. You set them by turning a knob on the back to wind each side. They need no batteries and they’re charming, but they have one real limitation: they can’t do increment or delay — they simply count down. Lovely for casual play, short of the mark for modern tournament controls.
Digital clocks are a small screen, a few buttons, and a menu of presets. They do everything an analog can plus increment, delay, a move counter, and multiple time periods in a single game. Every serious tournament today uses digital.
Increment vs delay
This is the one concept that confuses almost everyone, and it’s worth getting right because it changes how a game feels in time trouble. Both exist to stop you losing a winning position just because you couldn’t physically move and press fast enough. They solve it differently:
- Increment (Fischer) adds a fixed number of seconds to your clock every move, and you keep whatever you don’t spend. Play fast and your time can actually grow. “5+3” means 5 minutes plus 3 seconds added each move.
- Delay (Bronstein / simple) gives you a short countdown buffer before your main time starts dropping each move. Use it or lose it — it never accumulates. “G/5 d3” means 5 minutes total with a 3-second delay before the clock ticks down.
The practical difference: with increment a careful player can bank time, so the display can rise. With delay your total can only ever go down — the buffer just shields each individual move. FIDE events lean on increment; many US events use simple delay. If you’re still deciding which suits your group, you can feel the difference on the online clock before you buy anything, and the guide to bullet, blitz, rapid and classical covers which control fits which kind of player.
Setting up an analog clock
Analog clocks are simple precisely because they can’t do much. The goal is just to set each face so it reaches 12 — flag fall — exactly when that player’s time should expire.
- Decide the time per side. Both players normally get the same budget, say 30 minutes each. There’s no increment or delay to configure.
- Set each face by working backwards from 12. For 30 minutes, turn the knob on the back so the minute hand sits at “half past,” 30 minutes short of 12. For 60 minutes, set it straight down at 6.
- Check the flags. Each flag should rest flat, not already lifted. If it’s raised, you’ve set that face too close to 12.
- Centre the slider, then start White’s clock. Make sure the middle slider sits level so neither face is running. To begin, the clock is started so that White — the player to move — is ticking down. Conventionally Black starts White’s clock; casually, just press so White’s side runs.
Setting up a digital clock
Every digital clock has a slightly different menu, but they nearly all follow the same logic: you don’t type in raw numbers, you pick a preset program number that matches your time control. Keep the manual handy the first few times — the button sequences genuinely differ between models.
- Find the control you want — for example 10 minutes no increment, 15 minutes plus 10 seconds a move, or a two-stage classical control like 90 minutes for 40 moves then 30 minutes, with 30 seconds increment throughout.
- Enter setup mode — usually a long-press on “set” or “menu,” or a recessed button on the base. The display starts flashing a program number.
- Scroll to the matching preset. Cycle with the plus/minus or rocker. A good clock ships a reference card mapping numbers to controls — keep it.
- Confirm and check the method. Lock it in, then verify it’s set to increment or delay as you intended, and that both sides show the right starting time.
- Reset before each game. Most clocks reload the last-used program with a quick reset, so you don’t reprogram every round.
If your control isn’t a preset, most clocks have a manual mode where you set the minutes, the increment or delay seconds, and the move count by hand — slower, but it covers the unusual club controls presets miss.
Which clock should you buy?
If you only play at home, the online clock or a cheap analog is plenty. The moment you enter rated tournaments, you’ll want a federation-approved digital model.
- DGT 2500 — the current FIDE-recommended tournament clock and successor to the DGT 3000, with a much larger display, dozens of presets including Armageddon controls, and battery life measured in years. The right buy if you play rated chess.
- DGT 3000 — the clock seen between players at the World Championship for years. Still excellent, with a clear display and connectivity to DGT electronic boards.
- DGT 2010 — the robust, quiet-buttoned workhorse you’ll find filling tables at large opens. Built to survive thousands of hours of club use.
- DGT North American — designed around US Chess (USCF) controls, which makes American formats quick to set. A common “first serious clock” in the US.
- ZMart Fun II — a versatile club-and-classroom favourite with customizable presets and both Fischer and Bronstein timing, in a low-profile anti-slip case.
- DGT 1002 — simple plus/minus setup and a clear display. The easiest clock to hand a first-timer or school club.
The rules of pressing the clock
A few points trip up newcomers in their first rated game. Knowing them makes you look like you’ve done this before.
- Same hand, every time. Under the FIDE Laws of Chess you must press the clock with the same hand you used to move the piece.
- Move first, then press. Complete the move on the board, then press. Pressing before you’ve let go of the piece doesn’t complete the move.
- Don’t hover. You can’t keep a finger resting on or over the button, or hold the clock down.
- The arbiter decides placement. In a rated game the arbiter chooses which side the clock sits on. By convention, when no arbiter has ruled, the player with Black picks the side.
- Both flags down. In a sudden-death finish, if you can’t tell whose flag fell first, the game is drawn.
Once you’ve set the clock, the rest is just chess. If you’d rather skip the hardware entirely, the online clock handles every control here — bullet, blitz, rapid and classical — on any device.