Chess Clocks in Tournaments: The Simple Guide for Amateur Organisers

Chess clocks confuse almost every first-time tournament organiser. What's "increment"? How many clocks do you need? What happens when someone's time runs out? This guide answers every clock question in plain English — no chess background required.

What Is a Chess Clock and Why Does It Matter?

A chess clock is a double-sided timer with one button per player. Each player has their own countdown. When you make a move, you press your button — that stops your clock and starts your opponent's. The total time in a game is shared between both players, not a single countdown for the whole game.

Without clocks, games can drag on indefinitely. One slow player can hold up an entire round. In a tournament with 12 players running 4 rounds, a single game that takes 90 minutes instead of 30 means everyone else waits around for an hour. Clocks keep your event on schedule.

How a Chess Clock Works: Step by Step

1. The clock is set before the game Both sides of the clock are set to the same time — say, 15 minutes each. This is called the time control.
2. White's clock starts first White's time begins counting down from the start of the game. The clock is placed so each player can reach their own button easily.
3. After each move, the player presses their button This stops their own clock and starts their opponent's. The button press is part of completing a move — you can't press first and then move.
4. When time hits zero, that player "flags" The clock shows 0:00. In most casual tournaments, the opponent claims the win. The player who ran out of time loses — unless their opponent has no pieces left to give checkmate (then it's a draw).

That's it. The rest is just choosing the right time settings for your event.

Time Controls Explained: What Do Those Numbers Mean?

When someone says "10+5" or "15+10", they mean:

• The first number is minutes per player at the start
• The second number is seconds added after every move (called increment)

Why increment matters

Increment (the "+10" part) prevents a specific frustration: a player who is completely winning but has 2 seconds left loses to the clock before they can checkmate. With 10 seconds added per move, as long as you keep moving, you always have a little buffer. For casual tournaments, always use increment. It removes a lot of arguments.

Which Time Control Should You Use?

Match the time control to your event. Here are the most common options:

Time Control	Approx. Game Length	Best For
5+3	~15 minutes	Blitz events, speed tournaments, warmups
10+5	~25 minutes	Lunchtime school events, quick pub nights
15+10 Recommended	~35 minutes	Club nights, school tournaments, most casual events
25+10	~55 minutes	Serious club events, regional opens
30+0	~60 minutes	Longer events, no increment (less common now)

Increment vs. Delay: What's the Difference?

Both add time to prevent flagging on a winning position. They work differently:

• Increment — adds seconds to your clock after you press the button. The most common method. "15+10" means you gain 10 seconds every time you move.
• Delay (Bronstein) — pauses your clock for a few seconds before it starts counting down. Less common, used in some North American events. You still gain those seconds, but only if you move before the delay expires.

For a casual tournament, increment is simpler to explain and set up. Stick with that.

Do I Even Need Clocks? (Honest Answer)

For a very casual event — six friends at a pub, a class of 10 kids playing for fun — you can survive without clocks by setting a simple house rule: "If a game isn't finished in 25 minutes, the player with more material wins, or the game is a draw."

But the moment you have more than 8 players, or players who genuinely want to think, you need clocks. Without them:

• One slow game holds up the whole room
• Players complain the other person is "taking too long"
• Your 3-hour evening turns into a 5-hour evening
• Experienced players have a huge unfair advantage over beginners (they can take unlimited time)

How Many Clocks Do You Need?

One clock per board. If you have 12 players, that's 6 games running at once — so you need 6 clocks.

Practical options:

• Buy them: Basic digital chess clocks (DGT 1001, ZMF-II) cost £15–£25 each. A set of 6 costs roughly £90–£150 — a one-time investment that lasts for years.
• Borrow them: If you're a school coordinator, your local chess club likely has a set you can borrow.
• Ask players: Regular club players almost always own a clock. Send a message before the event asking who can bring one.
• Smartphone apps: Free apps like Chess Clock (iOS/Android) work fine for casual events. Not ideal for serious play but perfectly acceptable for a pub night.

Setting Up a Clock Before a Game

Every clock model is slightly different, but the general setup process is the same:

1. Hold the setup button (usually a long press) The display will show a menu or blinking time.
2. Enter the time per player Use the +/– buttons. Set to your chosen time, e.g. 15 minutes.
3. Enter the increment After confirming the base time, you'll be asked for increment. Enter the seconds, e.g. 10.
4. Confirm and position the clock Place it at the side of the board closest to both players. White should have the button nearest to them on the left side of the board (standard convention).
5. Announce the start Tell both players the time control. Start White's clock — game begins.

Clock Etiquette and Rules Players Need to Know

Give players a 30-second briefing before Round 1. Cover these points:

• Press the button with the same hand you moved with — no "pre-pressing" before the move is complete
• Don't bang the clock — a firm press is fine; slamming is poor etiquette
• Don't hold the button down — just press and release
• If the clock malfunctions, stop both clocks and call the organiser — don't keep playing
• If you run out of time, your opponent must claim it — the game doesn't auto-end, someone has to say "flag"

What Happens When Time Runs Out?

When a player's clock reaches 0:00:

• Their opponent says "flag" (or points to the clock)
• The player who ran out of time loses — unless the opponent cannot possibly deliver checkmate (e.g. they only have a king and a knight left). In that specific case, the game is a draw.
• If nobody notices the flag and the game keeps going, the result stands as played — don't retroactively claim a win after losing.

For casual tournaments: don't overthink the rules. If someone flags and their opponent claims it, the game is over. Move on. Arguments about whether checkmate was still possible are rare at club level.

Common Questions from First-Time Organisers