Chess clock

How to use it

1. Pick a time control, e.g. 5+3 (5 minutes each, 3 seconds added per move).
2. Put the device between the players. Black taps their side to start White's clock.
3. After each move, tap your own side (or press Space) to start your opponent's clock.
4. A clock that reaches zero turns red: that player has lost on time.

Time controls explained

• Increment (Fischer): after each move, the bonus seconds are added to your clock.
• Delay: your clock waits the delay seconds before counting down each turn; unused delay isn't kept.
• Bullet is under 3 minutes, blitz 3–9, rapid 10–59, classical 60+ (per player).