From: Marc Schefer <codexus <at> codexus <dot> com>
Date: 25 jan 2007
Subject: Re: First draft of the Universal Shogi Interface (USI)


Hi,

> Byoyomi starts always when the initial time reaches 0.
> That means that if you still have 20s to play and it's your turn, you have
> actually 50s to play, i.e. 20s for the initial time and then 30s of 
> byoyomi.
> Of course, at your next turn you'll have only the 30s of byoyomi :-)

To add to the confusion, there are two ways of counting the byoyomi.
The one described here is used on online servers and probably with
electronic clocks too but that's not actually the way it's done during
title matches.

In those cases, the players are not directly using a clock but instead
an official timekeeper writes the time each player uses and when they
are running out of time he will "count the seconds" (which is the
literal meaning of byoyomi).

Now the confusing part is that, in that case, the byoyomi isn't an
extra time period at all, but instead any move done in less than a
minute doesn't use any time at all. Even if there is still plenty of
time left, a 59 seconds move will be recorded as "no time".

Here's a more detailed explanation (from the British Go Journal but I
believe the system is the same for shogi):
http://www.britgo.org/bgj/10643.html

-- 
Marc Schefer - codexus <at> codexus <dot> com


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