From: david parry <dparry <at> MIDWAY <dot> UCHICAGO <dot> EDU>
Date: 9 dec 1996
Subject: Re: Byoyomi?

Occasionally, I see the phrase "30s byoyomi" in reference to a time control.
 Is this extra time added for each move?  How is it tracked?  Are regualr
chess clocks used?

response

I think this actually refers to the person who is calling out the time. When
i was entered in a college tournament in Japan when your clock ran out you
asked for a "byoyomin." The person calls the amount of time left.  For example
if it is thiryt second moves, person says 15 seconds, 10 seconds, 9,8,7,...
But this also varies from format to format, I have also seen clocks used.

                        David parry
                        dparry <at> midway <dot> uchicago <dot> edu