Tap the square the moment it lights up.

Reflex

Reflex measures your reaction time on a chess board. After a wait of random length one square lights up, and you tap it as fast as you can. The game runs five rounds and shows your average in milliseconds. Tapping before the square lights up is a false start and the round is played again.

How to play

  1. Press Start and watch the board. Do not tap yet.
  2. After one to four seconds a square lights up. Tap it as fast as you can.
  3. After five rounds you see each time and your average. Your best average is kept on this device.

Questions

Why do my times differ between devices?
The screen and the input add delay of their own: a touch screen, a wireless mouse or a slow display can each cost tens of milliseconds. Compare your scores on the same device.
Does reaction time matter in chess?
In blitz and bullet, where a game is decided in the last seconds, yes. In longer games the quality of the move matters far more than how fast your hand is.
Why did my round not count?
A tap before the square lit up is a false start. The round starts again so that guessing cannot give a good time.

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