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Chess Clock
Two clocks, one game. Set the time control, press your own clock when your move is done, and the increment is added before your opponent's turn. Runs locally in your browser.
Ready — White moves first. Press White's clock or Space to start.
Press your own clock after every move; the increment is added to the player who is about to move. Keyboard: Space starts or presses the running clock, P pauses and resumes, R resets. Time controls are locked once the game starts.