Chess Clock

A two-player chess clock in your browser: your clock counts down while it is your turn; tap your side (or press Space) to stop your clock and start your opponent's. Presets cover the standard time controls.

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Chess time controls

A chess clock gives each player an independent countdown; only the active player's clock runs. The standard time controls:

  • Bullet: 1 minute total (1+0), or 2+1 — under 3 minutes per side.
  • Blitz: 3+0, 3+2, or 5+0 — 3 to 10 minutes per side. The +2 is a 2-second increment added per move.
  • Rapid: 10+0, 15+10 — more than 10 minutes but under 60.
  • Classical: 60+ minutes, usually with increments; rarely used on casual online clocks.

Play ends when a flag falls (a player's clock reaches zero) or a result is agreed. The increment matters: 3+2 plays very differently from 3+0 because every move banks two extra seconds.

Tap mechanics: finish your move, then tap your own side (or press Space). Your clock stops and your opponent's starts. The clock shows which side is live.

FAQ

What do the numbers mean, like 3+2?

Minutes per side plus increment seconds per move. 3+2 means each player starts with 3 minutes and gains 2 seconds every move they make.

How do I switch the clock?

Tap your own side after moving (or press Space). Your clock stops; your opponent's starts.

What happens at zero?

A player whose clock reaches zero loses on time (flags), assuming the opponent has mating material under most rule sets.

Interval timing is a training aid, not coaching advice. Warm up, scale work/rest to your fitness level, and stop if you feel pain, dizziness, or shortness of breath. Verify any clinically relevant exercise plan with a qualified professional.